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

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
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