7 Segment LED Counter


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This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily (see Notes).

Schematic

Schematic for Counter

7 Segment Display Reference

7 Segment Display Reference

Parts

Part
Total Qty.
Description
Substitutions
R1-R77470 Ohm 1/4 Watt Resistor
U1174LS90 TTL BCD Counter IC7490,74HC90
U2174LS47 TTL Seven Segment Display Driver IC7447,74HC47
DISP11Common Anode 7 Segment LED Display
MISC1Board, Sockets For ICs, Wire

Notes

  1. All pulses to be counted are to be TTL compatible. They should not exeed 5V and not fall below ground.
  2. You can add more digits by building a second (or third, or fourth, etc...) circuit and connecting the pin 11-6 junction of the 74LS90 and 74LS47 to pin 14 of the 74LS90 in the other circuit. You can keep expanding this way to as many digits as you want.

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Comments

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anonymous
7 Segment LED Counter
Wednesday, July 09, 2014 1:04:58 PM
Can the ls90 counter be substituted for an ls193 counter?
Art
7 Segment LED Counter
Tuesday, April 29, 2014 5:41:50 PM
The 555 isn't a particularly good clock source for many counters, because it has ringing in the level transitions that cause multiple counts evident as skipped numbers. A more reliable solution for a general-purpose clock would be a single CMOS inverting Schmitt trigger such as 1/6th of a CD40106BE. Place a timing resistor between the input and the output of the inverter, and a timing capacitor from the inverter input to ground. For a slow clock rate that will result in a visible counting rate, use a 1 megohm resistor and a 1 microfarad capacitor. If you use a polar capacitor, make the (-) lead ground. The clock output is the inverter output. Connect the 5 unused inverter inputs to ground. If you're adamant about using the 555, sometimes a small capacitor (100 to 1000pF) connected from its output to ground eliminates the miscounts, but this is not a recommended solution because it may not work with all 555s and all counters under all conditions.
Pepper
7 Segment LED Counter
Monday, March 19, 2012 8:12:36 AM
What is the exact position when you transfer all those in the breadboard?
anonymous
7 Segment LED Counter
Monday, March 12, 2012 6:57:21 PM
gee! thanks it helped me a lot for we have a final project 0-99 counter God bless
Brian
16 pin keypad to 7447
Sunday, February 26, 2012 2:45:19 PM
Been looking for a simple schematic of connection between a 16 pin keypad and a 7447 chip. The purpose is to display on a 7 segment the number being pushed. Also, we plan on adding in microcontroller connection between the keypad and the 7447, to designate a code being entered. Any help would be greatly appreciated.
coxon
7 Segment LED Counter
Friday, January 13, 2012 3:54:01 PM
hi,can anyone teach me how to attach it with rfid so that the rfid reader can count how many cards are tagged.please help me
flash-Point Ballistics
7 Segment LED Counter
Wednesday, December 28, 2011 8:21:21 PM
Can you show me how to setup the IR portion to trigger the count?
satpambobo
7 Segment LED Counter
Friday, August 05, 2011 9:53:00 PM
my desire to play with SevensegmenLED, welcome to digital. if use 12V try get IC 4518 decode counter and 4511 Seven segmen driver. Add Transistor to pull more current, it can drive 4-5 Leds for each segmenline that you can assign as "Big" Seven segmen. (assume one LED need 25mA so 25x4 serial LED=100mA enough for one Tr BC547 / 9014 )
Sonny Eugenio
7 Segment LED Counter using 12 volts
Wednesday, May 11, 2011 6:38:31 AM
I would like to use bigger 7 segment displays which will be powered by 12 volts supply. I was considering of using dual voltages. Can I use 12 volts to power the common anode pins of my 7 segment displays leave the rest of the circuit at 5 volts? I was wondering if this would work.
anonymous
7 Segment LED Counter
Thursday, March 24, 2011 9:20:35 AM
What about the customer's way out ? its gonna counte twice that way
swapnil narke
7 Segment LED Counter
Tuesday, February 22, 2011 12:06:11 AM
why NAND gate is used for RESET the counter?
RB
7 Segment LED Counter
Wednesday, October 27, 2010 10:32:29 AM
how to reset the counter?? the counter circuit is displaying 8 instead of 0..... and the counter is not incrementing how to sort it out????
anonymous
7 Segment LED Counter
Friday, October 22, 2010 10:51:13 AM
Hi i am designing counter using same ckt but my counter is not showing no. 1.... it directly goes to 2 from 0...can anyone help me.....
anonymous
7 Segment LED Counter
Saturday, October 16, 2010 11:54:10 PM
what iscounting pin 14??
Hipervids.com
7 Segment LED Counter
Saturday, May 29, 2010 9:22:12 AM
Nice simple circuit. Do you know how fast it can count? Ive simulated it at 160 hz and works fine.
anonymous
7 Segment LED Counter
Saturday, May 29, 2010 6:27:55 AM
Why this display the randum ? What is wrong? Why this start number 1? Who could explain this?
anonymous
7 Segment LED Counter
Monday, April 19, 2010 10:19:16 PM
the inconsistant counting is usually due to bouncing... look up switch/NAND latching
Simon
7 Segment LED Counter
Friday, March 05, 2010 7:41:06 AM
Hi I'm looking for advice on a SIMPLE counter circuit, with two gap sensors, ie an entry-exit system, two decade counters and two triple 7 segment displays. Meaning that it can count from 0-99 ( but I only need 71) and it can count down in the case of exits
janu
7 Segment LED Counter
Tuesday, February 09, 2010 3:20:35 AM
what should be given to the count in input.....??? n thanx 4 the circuit:)
anonymous
BCD counter
Thursday, January 28, 2010 3:27:19 PM
can anyone tell me wether a bcd counter is a combinational or a sequential circuit?
FROILAN of roxas CITY
7 Segment LED Counter
Tuesday, January 05, 2010 9:08:22 AM
Anyone can show me a diagram of a timer or 24 sec.shot clock using 7-segment display? thanks
anonymous
7 Segment LED Counter
Wednesday, December 30, 2009 9:10:25 AM
how can I reset this circuit?
shashank
7 Segment LED Counter
Thursday, December 24, 2009 9:12:29 PM
Thanks this is the circuit i was searching for . thanks very much !!!!!!!!!!!!!!!!!!!!
Deurgist
7 Segment LED Counter
Tuesday, December 22, 2009 11:37:47 AM
This is in response to questions regarding counting up irradically, and by two's (ironically, they have similiar answers). The issue is what is known as electrical "bouncing". This means the hi to lo transition state of the timers output - tho on an active lo (to the counters input) - it "spikes" just high enough to be registered as another pulse (counting in multiples). How to fix? Well you may have guessed it - by "debouncing" - time to google.
nette
00-99 count up count down timer...
Sunday, October 18, 2009 11:45:45 PM
guys... pls do help me how to connect using 74ls247 and 74ls192 so that i can make a count up count down timer... tnx2 just mail me her net_kichay@yahoo.com... tnx2
SRowe
7 Segment LED Counter
Sunday, October 18, 2009 5:04:49 PM
would it be possible to have this count up in 2's or 5's... instead fo just 1's? if so how would you go about making it work so like one momentary button push makes the counter jump up in 2's or whatever cheers
anonymous
Help! Added 555 timer for this counter.
Wednesday, September 23, 2009 1:34:16 AM
I built this circuit using 555 timer Astable as my pulse. My problem is that it skips numbers. Like it will count from 1 to 4 then 7 and back to 1. Some times its random numbers. I thought I might have had some bad chips but I replaced them with new ones. For the 555 timer I am using R1 10k R2 100k and 10uF for a frequency of .068Hz. Doesn't any body have any suggestion why this might be skipping numbers?
Danpher
7 Segment LED Counter
Monday, September 14, 2009 10:58:42 PM
i am about to design a 24-second shot clock using the seven-segment light emitting diode....if you have an idea on this matter, kindly send to me steps to be followed in makikng such device....
nina
7 Segment LED Counter
Sunday, September 13, 2009 3:03:47 PM
hi! i was just wondering, i am looking for a circuit that counts up to 12...can i get any help with that?..esp on how to expand this particular circuit to be able to do that. thanks!
chillychintu
7 Segment LED display
Sunday, September 13, 2009 3:35:59 AM
hey anyone know's how to display alphabets in common cathode seven segment display? If yes then give me a brief description about it on my mail.. I will be really grateful
Ronald Cayne
7 Segment LED Counter & Mercury Switch
Saturday, September 12, 2009 2:40:56 PM
Hi There I am a real novice but want the following. Help would be greatly appreciated. Can I use 12 V DC Circuit with this device? What alterations would be required. I am using a mercury switch and everytime the circuit closes even momentarily I want to record the count, Source is a 12VDC coming from my auto battery. Please help as to where the various components can be purchased. Thanks Ron Cayne
trevor
double 7 Segment LED Counter
Thursday, August 27, 2009 5:48:35 AM
i want to build counter circuit that counts to 108..using a toggle button it must increment by 1 everytime the button is pressed when entering and decrement by 1 everytime the button is pressed when exiting
rowan
7 Segment LED Counter
Friday, August 21, 2009 6:51:10 AM
michael, you must use a synchrous up/down bcd counter ic.. you can use a 74ls190.. you can check this link.. http://rowatronix.wordpress.com/2009/05/09/updown-counter-circuit/
Michael
7 Segment LED Counter
Tuesday, July 07, 2009 11:27:59 PM
Would like to make a count up to 20 and down to 0 seven segment display using two manual momentary switches. any help would be appreciated.
fahim
7 Segment LED Counter
Tuesday, May 26, 2009 8:20:08 AM
i want conected 7447 with seven segment. how do i that?
ginvin
7 Segment LED Counter
Wednesday, April 29, 2009 12:00:47 PM
I have a 12V DC fan motor, it have 3 wires, one of it, output the pulse width signal. Now I want to convert the pulse signal to speed (r.p.m) to show on 7 segment. How can I do it??? Thank you very much!
JJ
LED
Saturday, February 28, 2009 12:56:57 PM
Please what is the function of LED's
anonymous
7 Segment LED Counter
Tuesday, February 24, 2009 5:58:59 AM
hi we are facing the same problem of hear_Rock which is " i need to design a parking lot counter at basement parking. i need to use 2 sensor which is one at the entrance and exit. it will count the available space in the parking lot. if a car enter, the free space will be deducted. example from 100 to 99. it wil display at the 7segment at the entrance. so what i know to use is sensor, 7segment. the 7segment driver. i have to do this project by using microcontroller 8051 plz help n give me some guideline on schematic diagram or the equipment to use".we will really appreciate your help as soon as possible
nelak
7 Segment LED Counter
Wednesday, February 04, 2009 11:02:52 PM
i have a problem about my project i don't know how to connect them using 555 timer, 74LS92 and 74LS47 driver to make it counting 00-99, so i decide to ask from you guys if you know the diagram. thanks and God bless you
francis
7 Segment LED Counter
Sunday, January 18, 2009 9:05:47 PM
hello !!! how can we make it auto reset for this circuit ?
anonymous
7 Segment LED Counter
Saturday, January 03, 2009 9:23:57 PM
Hey All, Looks like an old thread but hey! Knowledge is great to share. To answer most of the questions here... Its simple, the IC that you are using comes with a data spec sheet showing functions and timing cycles. I am sure the answer is there. For the multiple use of the display or cascaded displays, thats easy too. When most counter reach max or preset cycle there is an output. Use this as the next clock input for each display in your chain of counters/display drivers. Should work out nicely. And a finally note, GREAT to see anyone and everyone alive and kicking. PEACE YA ALL!!!
rs
7 Segment LED Counter
Wednesday, December 24, 2008 6:52:16 PM
When you expand and build another display, do both displays just simply count 0-9. Or would it actually count 10, 11, 12, 13 etc...
bobo
7 Segment LED Counter
Wednesday, December 10, 2008 7:16:04 PM
Hello, my name is Bobo. Nice design for newbeginner. Two 7segment can build become digital countdown trafficlight LED. Aaron can u draw complete design with 555 clocker. start 99 finish at 00. 36 SevenSeg ? cool Chandrakumar ! my 4026 don't have enough power to drive SevenSeg :-(. SevenSeg drv 4511=7447 and BCD counter 7490 = 4518)
anonymous
7 Segment LED Counter
Tuesday, December 09, 2008 9:02:40 AM
what must be the input to 74ls90....
saleh
7 Segment LED Counter
Friday, November 21, 2008 2:52:53 PM
i have completing the seven segment display using IC74190(pulse counter IC),7447(display show IC),555(pulse creating IC) .but my target is shown upto 999 from 000..it will be complete before december 20th.so if any one need help than plz contact me.i will give u all of the information about setup the seven segment display.
dwaine
7 Segment LED Counter
Saturday, November 08, 2008 11:49:42 AM
Could someone plz help me to come up with an idea including 2 seven segment displays for a project asap. any idea except for a parking spaces plz. contact me at dwainemoore@ymail.com if you have any ideas.
p2ool
7 Segment LED Counter
Monday, October 27, 2008 12:44:29 AM
Can pulses from a 555 timer chip be used as the counts input?
anonymous
7 Segment LED Counter
Saturday, October 25, 2008 1:50:48 AM
My counter starts at 8, and resets to 8. Anyone know why it's not starting at 0, and resetting at 0 like it should be?
john
7 Segment LED Counter
Wednesday, October 22, 2008 9:48:58 AM
hi like james 12th august' i would like to know how to generate the pulse for the counter circuit. i would appreciate help / info etc john.
chandrakumar
36 digits 7 Segment LED
Monday, October 13, 2008 4:36:14 AM
I am a beginner.I am now working on a LED project where I have to interconnect 36 7segment LEDs to a microcontroller.I want to send signals to these LEDs sequentially and periodically.I need the schematic diagram and hardware logic to connect all those LEDs.I want to know what are all the components that have to use and their purpose.
anonymous
7 Segment LED Counter
Friday, September 26, 2008 3:34:35 AM
You could easily replace your two ICs with a 4026 counter IC. The 4026 takes a clock input and produces a seven segment decoded output.
Gcube
7 Segment LED Counter
Thursday, September 25, 2008 10:06:24 AM
any other IC that can replace 7490?
salm
7 Segment LED Counter
Saturday, September 20, 2008 12:56:15 AM
yahooo! thanks a lot sa for the circuit,, now, we can start are long long requirement of the course..
Mark
7 Segment LED Counter
Sunday, September 14, 2008 1:03:34 PM
I built this 7-segment circuit and it works once I got a good debounce signal for the clock. I'm trying to use this as my base for a shufflebd scorebd but I'm having problems trying to drive my 5" LED 7-segment displays. Is there some special circuit that I need to drive this large of displays? I want a simple counter circuit that just counts up when a button is pushed but I have to drive 2 sets of 2 5" 7 segment LED's but I can't even get 1 7 segment to work. Any ideas or help?
ali mir
7 Segment LED Counter
Sunday, August 17, 2008 5:23:21 AM
is it possible to use 4511 only with pic16f886 microcontroller?
james
7 Segment LED Counter(using 74LS192 and 7447) help help
Tuesday, August 12, 2008 2:55:26 AM
hihi how to connect using 74LS192 and 7447 to a LED display.... but before that you need to input a pulse in right? what kind of pulse or clock i going to use? and how to connect it
anonymous
7 Segment LED Counter
Saturday, August 09, 2008 11:07:01 PM
To AbleMicky: BCD stands for Binary Coded Decimal. An example of a four bit BCD: 4 3 2 1 = Bit Number _______ 8 4 2 1 = Place Value 0 0 0 1 = 1 0 1 1 1 = 7 1 0 1 0 = 10 1 1 1 1 = 15
hear_rock
7 Segment LED Counter
Sunday, July 06, 2008 11:44:21 PM
hii. i need to design a parking lot counter at basement parking. i need to use 2 sensor which is one at the entrance and exit. it will count the available space in the parking lot. if a car enter, the free space will be deducted. example from 100 to 99. it wil display at the 7segment at the entrance. so what i know to use is sensor, 7segment. the 7segment driver. i have to do this project by using microcontroller 8051 plz help n give me some guideline on schematic diagram or the equipment to use. i really apreciate your help..
bhe
7 Segment LED Counter
Tuesday, July 01, 2008 9:27:06 AM
hi.. plz help me doing a circuit using a 2 single seven segment, using 74ls90 and 74ls47.. it is used in the bank or cashier which is a number system that will increment when the next customer is next.... and it has a sound... how can i do it..thankz..
anonymous
7 Segment LED Counter
Tuesday, June 24, 2008 5:51:20 PM
2,3,5,7 AND 10 is sticked together (U1) for higher brightness, use 330 ohm
anonymous
7 Segment LED Counter
Tuesday, June 24, 2008 6:32:50 AM
ground pins are acutally negative polarity 2,3,6,7 is connected with 10 either switch could be used, normally open/close
ALFA 4
7 Segment LED Counter
Monday, June 23, 2008 6:30:19 AM
somebody pls help me with an equvalent of the 74c925 ic 4 digit counter
ABLEMICKY
7 Segment LED Counter
Wednesday, June 18, 2008 7:11:46 PM
from what i have learnt so far the i.c converts bcd inputed to it to a 7 segment display.pls i wat you you to explain the word bcd in its totality.from where can i get a bcd output?i would really apprieciate if my request is favourably considered.
AppyChappy
7 Segment LED Counter
Monday, June 02, 2008 5:39:18 PM
i've built a stopwatch using 555 timer and six 74190 decade counters connected to six 7-segment lcd displays but i can only get it to read 99:99:99. I'm having trouble getting every other counter to reset at 5 and trigger the next counter so the display reads 59:59:59. Any help you can offer would be great, thanks.
TNT
7 Segment LED Counter
Saturday, May 03, 2008 11:12:09 AM
hi all , i need to creat a 2x7 segments display stopwatch witch i can stop and resum the count and also reset it using a PIC16F84A microcontroller . i really need the circuit PLEASE.
pankaj sehgal
7 Segment LED Counter
Friday, May 02, 2008 1:25:56 PM
i would like to connect a seven segment display ,a bcd to seven segment decoder74LS47,and a counter 74LS192 and a buzzer for counting the no. of persons present in the lift and also to increment the no. by 1 when a person enters in the lift and to decrement the no, by 1 when a person exits from the lift. also when the counting reaches upto 9 , the buzzer starts buzzing. so pls provide me the necessary circuit detais
kathirvel
7 Segment LED Counter
Friday, May 02, 2008 1:08:37 AM
I want to construct a counter that counts from 60 to 00. plz help me....
Syafiq
7 Segment LED Counter
Thursday, April 24, 2008 10:32:47 PM
Do anybody know the two different types of 7-segment LED?? Any information about this is much appreaciated. Thanks
Ross
7 Segment LED Counter
Sunday, April 20, 2008 1:40:09 PM
I've been loking for a simple counting circuit like this for the last 4 days. Thank you.
Francis
7 Segment LED Counter
Friday, April 18, 2008 4:37:05 AM
I have a problem in using 7 segment display. I designed a counter from 0 to 9 and I want it to display in big 7 segment 6x8 in size. But the voltage of big 7 segment display is 12V and the 74ls47 bcd converter only 5V supply. What can I do, Thank you very much
memo
7 Segment LED Counter
Thursday, April 17, 2008 7:21:46 AM
I need the program which calculate the value of resistance and capacitor to use timer 555 IC in astable mode I need help
MEHRAD MIRZAEI
7 Segment LED Counter
Monday, April 07, 2008 8:48:11 AM
I WANNA KNOW HOW IT WORKS?
hakiem
counter that count from 0 to 3 using 7476 (that has 2 - jk flip flop)
Friday, March 21, 2008 4:17:21 PM
i wanna the connection diagram on the 7476 ic for counter that count from 0 to 3 , need help
Melvin
7 Segment LED Counter
Monday, March 17, 2008 11:47:37 AM
i need to make a counter that able to trigger(add & minus value) the seven segment display using a light sensor.Example is that when a car stop under a light sensor it will minus value in the current seven segment sector & when the car left, it will increase value for the seven segment display.If anyone got any relevent infomation please e-mail me.THANKS.
CJ
7 Segment LED Counter
Friday, March 14, 2008 11:48:56 AM
how can i make an up-down counter that will initialize at 20 and then either decrement or increment?
spepe
7 Segment LED Counter
Sunday, March 09, 2008 5:39:08 PM
Hi all! I have a problem. I have built this circuit I only replaced the Display Driver IC with an other (4511) but the circuit does not works as it should. I have also built a 555 astable to generate pulses for the input. When I connect them than the counter counts like this: 0,1,2,3,c,b,4... I don't know what is the problem. Any help is appertained! Thanks in advance! Bye!
phuti
7 Segment LED Counter
Saturday, March 08, 2008 8:11:04 AM
i need to build a 2 digit,7 segment display, countdown timer how do i? thanks. especially how to connect two counters to read the countdown and to the 7-seg display
babyface
7 Segment LED Counter
Saturday, March 08, 2008 1:38:34 AM
im using 2 seven segment 2 74HC595 CONNECTED TO THE PIC!HOW CAN I CONNECT THE 2 SEGMENT TOGETHER TO HAE 0-99 READOUT
momo
7 Segment LED Counter
Thursday, March 06, 2008 7:03:08 PM
I just want to know if the 7490 can be used to count from 0-5 and 0-1, if yes, can someone please e-mail me how to do it, i need it badly. I have 2 days to make a counter that will show 0-15 mins. using only 555 and 7490. i used 7493 but obviously it didn't work. thanks
salinas
74193
Wednesday, March 05, 2008 1:15:25 AM
how about using 74193? how can i do that...? also with LM555 timer>>> pls help me...
joy
7 Segment LED Counter
Tuesday, March 04, 2008 6:21:45 AM
How can i make the circuit shown above which only counts when triggered by a pulse. For example, when a car passes a sensor, the displayer is triggered. Hoping for a response. Thank you...
Denis
7 Segment LED Counter
Monday, March 03, 2008 11:50:53 PM
I have an equipment that uses a syrelec 100pa counter. the seven-segment display is not working but the comtrol buttons are working. the counter is used to actuate an electromechanical lifting cylinder. I want to either make the 7 segment display work or diasble the whole counter. I don't know how to do it. Help!
Suresh
7 Segment LED Counter
Monday, March 03, 2008 12:34:24 AM
could you help me to build a counter with 5 7segment so I can count from 0 to 99999 and is there any pin to reset the counter to be a zero? thanks for your help i realy need the circuit diagram... please email me aansuresh@yahoo.com.sg
flavia
counter
Friday, February 29, 2008 10:09:21 AM
can you help design a counter that will count the number of times a mouse moves in and out of the door, considering one in and out is one count
nalo
7 Segment LED Counter
Thursday, February 28, 2008 3:22:00 AM
Pls. help me find circuit that can count from 0-8 then restart after; using only 1 switch and count up every toggle....basic gates only....TNX
angela
7 Segment LED Counter
Tuesday, February 26, 2008 4:36:44 PM
Help, I need to design a circuit using 2 -7 segment displays, with 741 op-amps, and an ADC 0801-0805 family converters and any other components. The display needs to read a weighted load off of a 12 inch piece of steel. If anyone has an idea, can you please E-mail me? Thanks!!!
anonymous
7 Segment LED Counter
Tuesday, February 26, 2008 12:30:56 PM
how will i conect two 7 segment display to show 60 seconds?
rm
7 Segment LED Counter
Tuesday, February 26, 2008 6:28:13 AM
,pls help me how to make a scematic diagram in 2 digits 7 segment counter
Thomas
7 Segment LED Counter
Tuesday, February 26, 2008 6:03:29 AM
I need to create a 3 digit BCD counter that will count upto 999 and then reset to 0.
spondon
7 Segment LED Counter
Wednesday, February 20, 2008 12:24:40 AM
i need to count the customers who enters in a bank.the customer will push a push button and counter will count its serial no and it will be displayed in 7 segment display
anonymous
7 Segment LED Counter
Tuesday, February 19, 2008 6:17:00 AM
could you help me to build a counter with 3 7segment so I can count from 0 to 999 using a decade counter and is there any pin to reset the counter to be a zero? thanks for your help i realy need the circuit diagram... please email me rolandbf@gmail.com
NYGQ
7 Segment LED Counter
Thursday, February 07, 2008 9:59:43 PM
every body who can help me to make a 7 segment binary counter,pls help me just email me and God Bless.....
samalouk11
7 Segment LED Counter
Saturday, February 02, 2008 12:56:14 PM
i like to have a shema of 7 Segment LED Counter
babyface
7 Segment LED Counter
Saturday, February 02, 2008 1:31:29 AM
i need help!how can i design a counter in which if a person passes a sensor the counter count it as 1 or up and count down if a person passes the other sensor!!its some kinda a passneger counter...badly need help
aga
two digit counter using TTL
Wednesday, January 30, 2008 7:23:58 AM
what is the difference between CMOS and TTL ICs
jay
7 Segment LED Counter
Monday, January 28, 2008 9:10:00 AM
hi. i need help. i have to design a circuit for countdown timer using an IC. its need to show hh:mm:ss. it need to start from 11:00:00 and end at 00:00:00. i try many times and its still doesnt work. can u please help me out. thank you.
anonymous
7 Segment LED Counter
Wednesday, January 23, 2008 10:01:17 PM
Why the first count is 6 not 1?
angst
7 Segment LED Counter
Saturday, January 19, 2008 7:57:35 AM
CAN YPU HELP ME,.ANYONE/,.I NEED A SCHEMATIC DIAGRAM OF 00-99 COUNTER 7SEGMENT DISPLAY,..TNX ,.. ,.EMAIL ME AT eiluj_872001@yahoo.com ,.thank's,...
dada
7 Segment Counter
Tuesday, January 15, 2008 9:39:29 PM
can you help me to make 2 digit 7 segment counter.tnx..
Junaid Ahamd
7 Segment LED Counter
Monday, January 14, 2008 10:45:26 AM
Dude Im planning to construct 3-digit counter and I want operate it with Assembly Language ..I need your urgent favor please help me as soon as possible I have to submitt my initial report to this coming monday !
Steve
7 Segment LED Counter
Thursday, January 10, 2008 2:37:58 PM
Wuld it be possible to see an example of how to add an additional DISP2 to this circuit, And how many DISPx would be the limit? I think this could be used as a timer circuit with Count IN on U1 pin 14 being driven by a clock IC But I would like to see how the DISPx could be expanded. Thanks
trish
7 Segment LED Counter
Wednesday, January 09, 2008 10:53:10 AM
can you help me to make 3 digit 7 segment LED counter.
Andrew Bacon
7 Segment LED Counter
Friday, January 04, 2008 9:31:14 AM
I find it really cool when you put multiple seven segment displays together but it really perplexes me how you overcome the difficulty of negative numbers!
beplusso
10 bit up counter
Tuesday, January 01, 2008 10:59:53 PM
hi all, i'm trying to create a counter that could count up to 768 in decimal (0011 0000 0000 in binary). This means i would need a 10-bit up counter. i'm using a 16-bit IC (74F269SPC) as the counter. i need some advice in constructing the circuit that will reset after counting up to 0011 0000 0000. thank you.
anonymous
7 Segment LED Counter
Friday, December 28, 2007 1:04:35 PM
Mark, you can make ur robot give one pulse for every step he do
PALLAVI
Presittable counter using 7 Segment display
Friday, December 14, 2007 12:54:18 AM
I am in M Sc. part 1 & my subject for seminar is "Presittable counter using 7 Segment display". I want whole information about this. so plz do needfull
Shauank
7 Segment LED Counter
Sunday, December 09, 2007 8:30:38 AM
If you are having trouble finding the 4790 and 4747 ICs you could also use the 4510 [TTL BCD UP/Down counter] and the 4511 [TTL display driver]. The circuit will then have to be modified slightly though.
teja
7 Segment LED Counter
Saturday, December 01, 2007 3:37:06 AM
this is very easy to implement.Easy to understand
deepankar
7 Segment LED Counter
Wednesday, November 28, 2007 11:39:22 AM
what is ic CD3044
deepankar
7 Segment LED Counter
Wednesday, November 28, 2007 11:34:01 AM
What is the working & ckt. dia. of 7 Segment LED Counter?
ToTomm
7 Segment LED Counter
Thursday, November 22, 2007 9:42:23 AM
When I click on my name I get ADODB.FIeld Error 800a0bcd BOF or EOF is True. Page may b e deleted? What's this Thanks Tom

(Editor's notes: Make sure JavaScript is turned on in your browser.)

Tom
7 Segment LED Counter
Tuesday, November 20, 2007 8:38:22 AM
Hello I have built the 7 segment counter and I do need to add digits, because this is for a shuffle board repair. I can't find the parts anymore. I am trying to get the diplay to work with only one digit before I try to expand and am having trouble in that when I take the input to ground by touching the ground post on my bread board it comes up random and sometimes with a letter. Do I need to put a gate on the input suchas an and? I am using a battery so I don't have any noise. Please help me with this? Thanks! Tom
anonymous
7 Segment LED Counter
Monday, November 19, 2007 11:13:00 AM
i have a project of digital system and i would like to have a block diagram for the counter(including 555timer circuit)
rhaymar
7 Segment LED Counter
Tuesday, November 06, 2007 10:52:10 AM
now i understand! thanks!
Mark
7 Segment LED Counter
Tuesday, October 30, 2007 5:29:13 AM
Hi, I am building a robot and I am including a seven segment display to count the distance my robot has travelled. Could someone please give me some advices of how I can make this work. thankyou very much
syed aqeel ahmed
more counter projects
Saturday, October 27, 2007 2:58:37 AM
i wanna know about more counter projects , plz tell me and reply me if somone has it
anonymous
74LS47
Thursday, October 25, 2007 10:52:04 PM
How to use a 74LS47 ic.......????? Is there any example of Circuit Diagram
mzide
7 Segment LED Counter
Sunday, October 21, 2007 9:13:24 PM
to: saraanosaranymous you can use 7448 but your 7segment should be common cathode.
anonymous
7 Segment LED Counter
Thursday, October 18, 2007 3:25:11 AM
what pulse to give in to IC
Diachesa
LED Display
Tuesday, October 16, 2007 9:38:43 AM
can anyone help with the circuit diagram which can be used to control LED display to show RPM for the motor uotput shaft picked by a sensor
anonymous
application of counters
Tuesday, October 16, 2007 9:18:58 AM
i have project of digital systems where you design an autormobile parking control circuit so i would like to see schematic diadram of it.
anonymous
7 Segment LED Counter
Sunday, October 14, 2007 6:01:44 AM
i have a experiment on designing of MOD 60 counter with push button start/stop and reset pls design for me the circuit and explain how it works
levi''s
automobile parking control
Thursday, October 11, 2007 10:33:51 AM
I want to design a up/down counter vehicle parking counter using a pic. it has to have two inputs which in this case will be my sensor one sensor for coming cars (down counter), outgoing cars(up counters) at the entrance there should be 2 LED's one red and one green. when there is parking available the green LED will always be on and when the seven segment has displayed zero then the red LED will turn on meaning that there will be no more parking available. sir can you please help me with the diagram or circuit and the components that i'm going 2 use.
levi's
automobile parking control
Thursday, October 11, 2007 9:33:22 AM
if i don't have 74LS90 what other component can i used for the circuit of automoblile parking control?
anonymous
7 Segment LED Counter
Thursday, October 11, 2007 3:14:27 AM
what other IC can i use except 7490 and 7447 in seven segment display
saraanosaranymous
7 Segment LED Counter
Wednesday, October 10, 2007 4:43:22 PM
what is designed counter 0_6 by 7segment?what gates are used?tank you very mutch.
Ankit Somani
7 Segment LED Counter
Monday, October 08, 2007 9:01:27 AM
Sir I want to count 99sec to 00sec. Plz. mail me ckt diagram.
anonymous
7 Segment LED Counter
Monday, October 08, 2007 7:27:46 AM
which type of clock should be used +5 v or - 5 v ?
ishank
7 Segment LED display
Saturday, October 06, 2007 1:10:51 PM
hi sir, can u tell me how can i construct my own 7 segment display.. what will be its circuit and connection diagram.. what all material i will need.
TobyZ
7 Segment LED Counter
Saturday, October 06, 2007 6:01:12 AM
As not all applications always have to count up, it would be nice if the ability to subtract too. The parking lot full/empty could be a simple example, there are several others.
kat
7 Segment LED Counter
Friday, October 05, 2007 9:08:43 AM
your website is cool it is easy to understand needs better colour
levi's
7 Segment LED Counter
Wednesday, October 03, 2007 9:40:38 AM
i have a project so i want to know what components can i use to build the circuit for automobile parking
engr. james
7 Segment LED Counter
Monday, October 01, 2007 3:58:39 AM
hey.anonymous. im back. RTFM- Read the manual!!! visit this site for pin connections www.alldatasheet.com or www.datasheetcatalog.com
shihab
7 Segment LED Counter
Saturday, September 29, 2007 11:03:33 AM
hi.....i want to make a counter(4 digits) which should count when a 5VDC is given to it.There should be a reset switch by which we can reset the counter at any time.Please any genius send me a diagram and components required(i am not an electronics expert)
kat
7 Segment LED Counter
Thursday, September 27, 2007 1:50:58 AM
sir i just want to ask for help regarding our project.its a parking counter. the problem is,the counter resets to zero when it reaches 8.we just would like to know the remedy to the problem because we want the counter to display the number 8 without reseting if all the 8 slots are already filled.the counter also functions to subtract the number of cars that leaves the parking area...thank you very much..i hope to hear from you soon...
ben
3 digit up/down 7 Segment LED Counter
Wednesday, September 26, 2007 11:14:42 PM
this is my final project. a 3 digit up/down 7 segment counter using PIC16F84A. there will be 2 switches.one switch when press the counter will count up and when press again will count down. the other switch is for the reset. can you help me with this? i need the program and the circuit..
Ankit
7 Segment LED Counter
Monday, September 24, 2007 2:37:52 AM
Hi Sir, How can I make 7 seg. LED down counter which counts 60-00. Which is to be used for day to day work.
Mziwamadoda Mambila
74hc190 up/down ncounter
Saturday, September 22, 2007 3:13:13 AM
I'm the student of WSU i'm having a project of an automobile parking control so I want to know about the circuit diagram of that project.
Akshay
7 Segment LED Counter
Friday, September 21, 2007 11:36:50 AM
i have shown this project to my friend's but my question is what is that count in mean's our sir said that we have to give the IC 555 output through that count in.. please clear my doubt and send the pin layout diagram of 555 IC on akshay.padekar@rediffmail.com
anonymous
7 Segment LED Counter
Thursday, September 20, 2007 3:03:32 AM
can anyone give me pin connections for interfacing IC 4017 (decade counter) and IC 7447....
AFNAN
7 Segment LED Counter
Saturday, September 15, 2007 1:47:08 PM
CAN ANY ONE TELL IS IT POSSIBLE TO CONSTRUCT 7 SEGMENT LED COUNTER FOR SIGNALS OF TRAFFIC LIGHTS PLEASE REPLY ON E-MAIL
fuad
how to design 7 Segment LED Counter using software altera quartusII?
Friday, September 14, 2007 10:43:56 AM
please explain to me about cronology to design counter by using Flip-flop ang dlath.what is SW and IN pin?
jed
7 Segment LED Counter
Friday, September 14, 2007 7:10:48 AM
how can i use it as frequency counter in phase locked loop circuit?? w8 4 ur answer.
annabelle
7 Segment LED Counter apllication
Thursday, September 06, 2007 2:09:40 AM
i just want 2 know thecircuit we will be able to make a seven segment counts the no. of peso coin that would be inserted in a case.pls. send me asap.....thanks a lot
anonymous
7 Segment LED Counter
Monday, September 03, 2007 2:13:39 PM
when i want more number counter than 10 above. what can i do make circuit 7 segment LED counter, everyone please answer to me, thanks.
anonymous Ajani Oyelaran
7 Segment LED Counter
Monday, September 03, 2007 9:19:38 AM
I want to design a up/down counter using a PIC. It has to have two inputs which in this case will be my sensors one sensor for the incoming and outgoing . At the entrence there should be 2 LED' s one red and one green. When there is space available the green LED wil always be on and when the seven segment has displayed zero then the red LED will then turn on meaning that there will be no more space available. SO CAN ANY ONE HELP ME WITH A PIC PROGRAME TO DO MY PROJECT
Alex
7 Segment LED Counter
Sunday, September 02, 2007 2:30:11 AM
I'd like to know if i have to put a pushbottom linked to the supply voltage (5V) in the "count in",have i ???? I wait your answer!!!
cha
7 Segment LED Counter
Sunday, September 02, 2007 12:37:11 AM
hi sir how can i make a circuit using two 7 segment led diplay which will display only numbers from 0-20, then when it reaches the 20, the counting will repeat again from 0-20 and so on. its an up counter right? can you please help me with this matter. thank you very much. ^_^
P.A.Somasiri
2 digit 7 Segment LED Counter
Tuesday, August 28, 2007 6:47:57 AM
I am somasiri from Sri Lanka so I want a 2 digit seven segment display circuit for build a doctors calling number disply system.Please send me a good circuit for me. Thanking you, Yours trully, P.A.Somasiri
anonymous
7 Segment LED Counter
Friday, August 17, 2007 6:48:24 AM
hi sir. thanks for the info bout this 7 segment counter. but in our project we are required to have a reset and set button. could you help with that one? thanks! =)
TUMZA
7 Segment LED Counter
Monday, August 13, 2007 5:11:50 AM
I want to design a up/down vehicle parking counter using a PIC. It has to have two inputs which in this case will be my sensors one sensor for the incoming cars(down counter), outgoing cars(up counter). At the entrence there should be 2 LED' s one red and one green. When there is parking available the green LED wil always be on and when the seven segment has displayed zero then the red LED will then turn on meaning that there will be no more parking space available. SO CAN ANY ONE HELP ME WITH A PIC PROGRAME TO DO MY PROJECT
anonymous
7 Segment LED Counter
Sunday, August 05, 2007 12:01:35 PM
I was wanting to know if it is possible ,using a 555 timer and a lm324 quad op amp, to make a simple clock or counter. I don't have much eletronic knowledge. can some one help me out?
pavithra
7 Segment LED Counter
Sunday, August 05, 2007 8:37:20 AM
The circuit works with a 5v regulator IC for the two IC's in the diagram
fahad
7 Segment LED Counter
Sunday, August 05, 2007 3:44:36 AM
we are making counter using 7493 and 7476 ca you help me
anonymous
7 Segment LED Counter
Friday, August 03, 2007 10:47:58 AM
hi ..where does a pushbutton connect to the clock input?
anonymous
7 Segment LED Counter
Wednesday, August 01, 2007 1:22:50 PM
i need to make a 7 segments, 8 LEDs display using PIC16F84A. can you help me with program and using proteus to run this program? my e-mail address is nineteen_jholie_hau@yahoo.com.ph ever someone could help me out with this pls. e-mail me.
suresh
problem related to decade counter(74290)
Monday, July 30, 2007 7:00:09 AM
hello sir, i've got some Doubt.hope u'll find solution problem is while making mod-10 counter from mod-16 counter we used to connect Qd and Qb output's to the input of NAND gate for resetting the counter back to zero.but using 74290, (decade counter) , converting it into mod-6 counter we have to use AND gate instead of NAND gate for resseting the counter back to zero.Why AND gate Why not NAND gate?plz help me. ive tried it in lab and verified also but why?
atif
7 Segment LED Counter
Saturday, July 28, 2007 7:57:51 AM
i want working of 7 seg led with computer programing
c.s.
7 Segment LED Counter
Thursday, July 26, 2007 9:31:04 PM
thank you for the info on seven segment displays. i will try the circuit out, wish me lots of luck
Asep
7 Segment LED Counter
Tuesday, July 24, 2007 12:14:24 PM
thank for all circuit diagram we are ferry need
anto
7 Segment LED Counter
Tuesday, July 24, 2007 6:17:58 AM
could you help me to build a counter with 3 7segment so I can count from 0 to 999 and is there any pin to reset the counter to be a zero? thanks for your help i realy need the circuit diagram
thomas
7 Segment LED Counter
Monday, July 23, 2007 5:41:09 AM
how do you eliminate "contact bounce" on the input
KANNADASAN
7 Segment LED Counter
Thursday, July 19, 2007 7:21:48 AM
sir, i really thankfull to you to make this kind of sites.i got very usefull collections.i am a electrical&electronics student.i have to some new kind of projects.you have to me to me a new kinds of projects.i am expecting your mesage.
messay
7 Segment LED Counter
Wednesday, July 18, 2007 6:36:48 AM
i want to know how to combine 7490 and 7447 to make a decade counter..
Ahmed
7 Segment LED Counter
Wednesday, July 18, 2007 5:37:20 AM
How does the 7 segment work?
anonymous
7 Segment LED Counter
Tuesday, July 17, 2007 12:10:42 PM
sir can i get counter alarm system
Gong Zhuo
7 Segment LED Counter
Saturday, July 14, 2007 6:41:59 AM
I am s student from China .This is the first time for me to see a page in pure English circumstance.The circuit you provided is very useful to me .Thanks
vincent
7 Segment LED Counter
Wednesday, July 11, 2007 8:51:37 AM
thank for the fantastic circui with diagram provided
johnmaya
7 Segment LED Counter
Tuesday, July 10, 2007 1:35:24 PM
how to combined ic 7490 and 7446 to create seven segment
anonymous
7 Segment LED Counter
Thursday, July 05, 2007 10:24:49 PM
Can this be counted down?
TONY
7 Segment LED Counter
Friday, June 29, 2007 10:02:22 PM
Thanks for the fantastic circuit diagram provided.
Ashraf
7 Segment LED Counter
Monday, June 25, 2007 4:09:19 PM
this same circiut possible to make a single IC?. if avilable, please inform ic number and pin numbers.
Diosdado
7 Segment LED Counter
Thursday, June 21, 2007 10:00:37 PM
Dear Sir: Good day! I visited your site and I found it very informative especially for me as an electronics student. I believe you can help me with my project. I want to construct a 3-digit up/down counter with computer-interface. If you could give me schematic diagram and explaination on how it works, that would be very helpful for me. Hoping for your soon response. Thank you. Respectfully yours, Diosdado
lo
7 Segment LED Counter
Thursday, June 21, 2007 6:38:11 AM
u
jojo
7 Segment LED Counter
Wednesday, June 13, 2007 12:22:38 AM
i have a problem to programm my 7 segment wish assembly language using pic16f877, for my project i need to use 4 seven segment to display four different numbers, to save the input pins of pic, i use bjt to act as a switch to my each 7 segment,but i had a problem to programm it into my pic .
anonymous
7 Segment LED Counter
Tuesday, May 29, 2007 10:29:28 PM
what is a cathode or anode in a 7 segment??
anonymous
7 Segment LED Counter
Tuesday, May 29, 2007 10:27:29 PM
how do i create a timer from a 7 segment led counter??Anyone??
black hog
7 Segment LED Counter
Friday, May 25, 2007 6:08:21 PM
great now what to do with it
mr.anwar
7 Segment LED Counter
Friday, May 25, 2007 4:17:16 AM
i need the driver and diagram the ripple counter
Mokkis
7 Segment LED Counter
Tuesday, May 22, 2007 8:02:08 PM
How do u make that counter to count to 0...15?
anonymous
7 Segment LED Counter
Saturday, May 19, 2007 5:11:13 PM
please i need help the pic18f4520 used output hex count haw i can contact the seven segmant driver with the pic? how i can interface seven segment and keypad with pic18f4520 ?
anonymous
7 Segment LED Counter
Saturday, May 19, 2007 1:24:46 PM
for clear the counter just turn off an turn on.. jejeje
anonymous
7 Segment LED Counter
Wednesday, May 16, 2007 10:34:28 AM
i want to know the internal stucture of 7 segment
sano
7 Segment LED Counter
Tuesday, May 15, 2007 11:37:38 PM
please i need help the micro 8051 used output hex count haw i can contact the seven segmant driver with the micro ? haw i can convert hex count to abc count ?
ADIL KHAN
7 Segment LED Counter
Tuesday, May 15, 2007 11:55:48 AM
CONTAINS GOOD DESCRIPTION ABOUT 7 Segment LED Counter
annicholasonymous
7 Segment LED Counter
Tuesday, May 15, 2007 8:37:01 AM
How do can interface this counter with acomputer
anonymous
7 Segment LED Counter
Thursday, May 10, 2007 2:39:04 PM
how do i add a reset?
ahad
7 Segment LED Counter
Monday, May 07, 2007 3:03:38 AM
i wan to count the pulses of fowmeter whose out put is 10 mv digital. plz tel me what can i do?
Ramzan Hingoro
6 gidits Analog Pulse Counter: 7 Segment LED
Sunday, April 29, 2007 6:39:30 PM
I want 6 gidits Analog Pulse Counter: 7 Segment LED circuit diagram
paul
7 Segment LED Counter
Friday, April 27, 2007 8:42:15 AM
i would like you to show the construction of a digital readout incorporated to a varible power suppy
PANKAJ PAWAR
7 Segment LED Counter
Sunday, April 22, 2007 6:30:25 AM
I WANT TO DISPLAY THE SPEED IN RPM WITH THE HELP OF IC 7447 AND IC 7490. I AM ABLE TO DISPLAY COUNT NOT SPEED. PLEASE GIVE ME ANSWER AS EARLY AS POSSIBAL
Jimmy
7 Segment LED Counter
Tuesday, April 17, 2007 12:10:42 PM
Excuse me , what is the use of U1's pins 2 , 3 , 6 , 7 ??
Nguyen van Quang
7 Segment LED Counter
Wednesday, April 11, 2007 2:34:27 AM
Dear all I use Electronics Workbench V5.2 to simulation this circuit. But it doesn't work as the result. Only number 8 display. I use 7490 and 7447. Could you help me?
dcaprio
7 Segment LED Counter
Saturday, April 07, 2007 2:19:37 AM
Sorry but I'm a newbie rookie. I would like to build this and was checking on parts. They list several 7 segment LED's and all have a bus polarity of CA or CC. Which do I use or will either one work?
dcaprio
7 Segment LED Counter
Saturday, April 07, 2007 1:59:46 AM
Can this counter count backwards? If not how could I modify it to? Thanks.
chucks
7 Segment LED Counter
Wednesday, April 04, 2007 7:19:01 PM
pls I need the internal schematics of the 7447A and 7490 ics and their details. Thanks

(Editor's notes: Try looking at the datasheets?)

santosh
7 Segment LED Counter
Wednesday, April 04, 2007 3:18:10 AM
it would be clear if u give internal structure of ic 7447 and ic 7490 and their details. but the content u presented is very useful i am very much thankful to u ur content helped me alot
tyson
7 Segment LED Counter
Saturday, March 31, 2007 10:56:34 PM
very very thank you
tk2
R1-R7
Friday, March 30, 2007 2:30:29 AM
Can I substitute R1-R7 by placing a single resistor at LED's anode?
anonymous
7 Segment LED Counter
Thursday, March 29, 2007 2:39:10 PM
very useful. Ta
pinkphobia
7 Segment LED Counter
Thursday, March 29, 2007 10:20:50 AM
would you please explained it to me, how it is work??? thank U
jd
7 Segment LED Counter
Thursday, March 29, 2007 10:17:43 AM
I built a timer circuit that will display an on time of about 59 seconds and a off time of about 26 seconds and need to know how to build a seven segment display counter circuit to display my on and off time. Can you help me.
Tanmay
LED DIRECTION INDICATOR
Monday, March 26, 2007 11:47:37 PM
i NEED INFORMATION ABOUT LED Direction indicator and ic7490 urgently.
anonymous
7 Segment LED Counter
Monday, March 26, 2007 11:32:55 PM
How can you clear the digit?
pankaj
7 Segment LED Counter
Thursday, March 22, 2007 6:47:18 AM
prize of the project
rhaymar
7 Segment LED Counter
Wednesday, March 21, 2007 1:07:14 PM
i dont understand this stuff!! would you please explained it to us how it is work
anonymous
7 Segment LED Counter
Tuesday, March 20, 2007 10:34:39 PM
Can it count down?
ajebob
7 Segment LED Counter
Monday, March 19, 2007 8:51:27 AM
what is the purpose of the "count In"

(Editor's notes: Each pulse advances the count by one.)

anonymous
7 Segment LED Counter
Saturday, March 10, 2007 1:39:59 AM
how the 7447 decodes the input BCD to seven segment display?
anonymous
7 Segment LED Counter
Wednesday, March 07, 2007 1:31:57 AM
YOU MUST SHOW ON HOW TO ASSEMBLE THIS 7 SEGMENT LED
asaad from iraq
7 Segment LED Counter
Tuesday, March 06, 2007 3:07:22 PM
good thank you
ben
7 Segment LED Counter
Tuesday, March 06, 2007 3:17:30 AM
how about adding an LDR to the circuit, to make it an automatic counter
anonymous
7 Segment LED Counter
Sunday, March 04, 2007 2:51:24 AM
HOW TO MAKE AN INPUT PULSE THAT THE DISPLAY VALUE WILL INCREMENT IN ORDERLY MANNER
anonymous
7 Segment LED Counter
Friday, March 02, 2007 7:03:07 AM
How to use Total 10?
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