|Home > Circuits > Power Supply > Fixed Voltage Power Supply|
|The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it outputs is dependant only on the regulator and transformer you choose. The maximum output current is 1.5A.|
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|shouldn't the T1 be at least 2V more than the required voltage?|
|how to generate a one volt power supply from an main ac supply.|
|I am involved in a senior project that requires me to build a 6V 1.5A power supply. How can I determine what the values I need for the Fixed Voltage Power Supply schematic that is provided from your website? Your help is very much needed. Thanks.|
|The 1/2/3 are the pins on the LM78xx. I have a question though. Since I'm going for 5v out, I imagine that I could replace the LM78xx with the R-785.0-1.0 from RECOM? Better efficiency but would only have 1A out, for me that's fine as it's only to power USB type devices.|
|can u please tell me why 3 & 2 is written in U1|
|its very easy ,use ( LM7805 ) to get 5v DC power supply|
|Should the Switch (S1) not be on the Positive / Live side before the transformer?|
|what is the purpose of D1, D2, C2, C3, and C4? And, why you didn't include resistor in the filter and for the load? thanks... hope you answer my questions ASAP...thanks again|
|Hi, I would like to build a power supply that can give out 24V DC at 5A from 240V AC. What parts in this circuit do I need to change to achieve this. Thanks.|
|ASSALAM o ALAIKUM! sir i want the circuit which regulate from 1.2 to 30 but i want that circuit having transformer whose AC input is 220 volt i have seen your circuits in your circuits AC input in the transformer is 120. plz give me the circuit as soon as possible i shall be very thank ful to u for this act of kindness|
|what is fuction of diode D2 in the circuit?|
|Hello, I've been building grow light panels using cement mixing tubs from a home center and high output LEDs. The combination of 1 blue (465nm) to every 3 red (650nm) works very well. The LEDs that I use are 10,000mcd with iF of 30ma at 3.6vF. To this point I have been buying used 36VDC golf cart battery charging transformers. These chargers average 36VDC with spikes up to 36.2VDC so I run multiple series of 10 LEDs with 6.8Ohm 1/4 watt resistors per series. I use a grid of 17 x 21 with 3/4" on center. This leaves 3 LEDs unaccounted for so I place them on the panel enclosure as 'decorations'. My problem is that all of this depends on golf cart battery chargers remaining available and inexpensive. I find that it is getting harder and harder to find then. I think that most carts are now operating at 24VDC or 48VDC and that 36VDC is an obsolete design. That just means that I need to build my own. The design pulls 1,080ma of current and draws 39,100.32mw of output power. I have looked at 18VDC but an ideal design pulls 2,160ma of current at 18VDC. 2A is not quite enough and 5A transformers are ridiculously expensive. Is there a design out there for a 110/120VAC to 36VDC power supply? Thank you|
|I've Constructed a CKT Of 7-segment display anode type which uses conman anode type display.I've obtained the output which mean display shows digit from'0-9' but whats happened the no. is appearing randomly.please send me a solution on it|
|i have constructed 230v ac to 9v dc, by using 12v transformer and 7809 regulator, now am in need of 6v dc, what modification i should from the above, or i have to built seperate circuit by using 6v transformer and 7806 regulator, let me know by my email as soon as possible , thank you|
|Hi, Please help me I need to step down DC voltage from +/-13 -14.4V to 11.5 - 11.9V @ 3A DC can you help?|
|a friend from U.S.A. gave me an HP Printer/Scanner without a power supply, since i am fond electronics assembling, i want to assemble a 24V greater than1.5A fixed regulator. Please help and provide me Thank you very much, STRAMM|
|"What si the prupose of the fuse and capacitors" . . . love it! LOL|
|please help me out with the circuit diagram of a variable dc output (-12,+12 & +5v) power supply of 110v ac input|
|how about if the output voltage is 25 Vdc and the maximum output current is 5 Ampere? how the circuit going to be?this power supply will use the source from 240 Vac.can u please help me on this problem.reply to my email.thank you|
|In the above citcuit u1 means transistor please explane|
|What is the requirement on the voltage capacity of the .1uf disc capacitors? I looked at radio shack and the only ones they have listed are 50v. Would this be too much, since the other voltages seem to be 35v?|
|how about if the maximum output of the fixed voltage power supply is 6ampere?|
|i want to make a power supply of 5v & 12 v by using a single transformer help me....|
|its ic pin configration may be wrong because pin 1 is input and pin 3 is out put of that ics but in the circuit its pin look wrong|
|please give me the circuit diagram of 24V/5a power supply 220v.send in my e mail|
|I need circuit for 24V,5A D.C.output|
|What would be the values for a 13.8vdc 20A power supply--for a Ham Radio?
(Editor's notes: Not going to happen with that regulator.)
|Hi every one, i need 24V/5A dc form an 220v ac so if any one knows the circuit design please post it in the site or send it to my e-mail Thanx|
|what is the purpose of the fuse, and capacitors please?|
|i want to build a 5-volt fixed power supply.kindly help me.
(Editor's notes: The diagram is right above the comments...)
|please give me information about the design of 10 volt power supply ,0 to 3 ampere current|
|pls give me 24volt to 12 volt diagram|
|CAN ANYBODY CAN DRAW SIMPLE DIAGRAM OF 230v AC 50 HZ 12vdc 10A|
|i need more information about switch mode power supply (5V and 1 Amp as the output. you can send me circuits diagram and other relevant infomation looking forward for your response|
|hello Sir in my project current rating of ic 7812 is not given. how much current i get from it??????/ different current ics are available ???????|
|how do i have the various output of -5v,+5v,-6v,+6v,....-18v,+18v on the same circuit.|
|Please send me ckt. diagram for +/-12VDC from 24VDC power supply urgently.|
|FIX THE PIN NUMBERS ON THE SCHEMATIC!|
|I suggest that you omit C3. The 7800 series of positive regulators have been known to oscillate with large-value electrolytics connected close to their output pins. The 0.1uF provided by C4 is sufficient to improve transient response without the risk of oscillation. In general, large output capacitors on 7800-series positive regulators invite instability.|
|want to build 12V 1amp constant DC supply with transformer (220V AC 50Hz). thanking u.|
|please give me some information about power supply design for -5 volts , 0 to 5 amperes|
|I'm having trouble finding the parts at local stores in Maryland. Do You know any good, reliable stores online or local|
|I built the fixed power regulator and blew up the IC. It seems you have the numbers wrong on the schematic. Pin 3 the left pin should be pin one and pin one should be pin three. In effect I grounded the input and seemed to fry the IC. I was using Radio Shack 7812 IC chip and the numbers are printed on the back but it does not indicate input, output , and ground. After research on the net and looking in the ARRL handbook I figured it out. Must have been a typo. please correct this before someone else ruins a IC. Good circuit now. Thanks Russ|
|The pinout for U1 shown in the schematic is wrong! I just fried my regulator, and almost fried my rectifier, because I trusted it. The correct pinout is: 1 - voltage in, 2 ground, 3 voltage out. You can verify this on anyother web page for these 78xx regulators. Here are two: http://www.geocities.com/siliconvalley/2072/3pinvolt.htm http://www.iguanalabs.com/7805kit.htm Now my project is delayed until I have time to buy a new regulator.|
|I'm a novoice and want to build fixed 7.2 volt power supply using a 12 v gel cell for my DVD CAM. Can anyone help? Thanks.|
|I need calculatoion of 18V power supply with 230V(50Hz)AC as an input input..it should have 5% ripple and 1 A at out put..|
|want to build 9V DC supply without transformer (220V AC 50Hz)|
|I HEARD THAT THE CIRCUITS OF SWITCHED MODE SUPPLY IS TOO DIFFICULT TO DESIGN. IS THAT TRUE? Y SO? THEN WHICH TYPE IS EASY THAN THIS? WHAT IS THE ADVANTAGES OF SWITCHED MODE 7 OTHER POWER SUPPLIES?|
|i saw all circuits in this website wonderful and useful..
but i need for my portable application is to convert 6V/4.5A to 5V/3A....
while i connecting 7805 regulated IC, IC get heating more with heat shink also and IC get damaged...
pls suggest me the circuits...
6V/4.5A Motor cycle Battery...
(Editor's notes: 3A is way too much for the 78xx series regulators. They are 1.5A max.)
|how to build regulated power supply without using the regulator IC ?|
|this is very usefull to me|
|hello I want make a fixed voltage power supply. How the make 200v to 50v ...what can I use transformer?|
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