Power supply regulator +15V -15V 1A by IC 7815 & 7915

When I builds the circuit Pre tone control by IC LF353 the finished , but can not be usable. Because of it wants a power supply +15V GND -15V at 500mA current. I pairs then builds the group Dual DC power Supply +15V,GND,-15V.

By use pillar equipment be IC 7815 , for +15V and IC 7915 for -15V. Which IC the bilateral can give currrent get about 1A. Other detail both of the circuit and model PCB you can see to follow a image.

The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated about 18 volts at 1 amp or higher, allowing for losses in the regulator. An application for this type of circuit would be for a small regulated bench power supply.

Circuit diagram of power supply regulator +15V -15V 1A by IC 7815 & 7915

The components list
IC1___LM7815___Positive Regulator IC
IC2___LM7915___Negative Regulator IC
C1,C2____2,200uF 35V___Electrolytic capacitors
C3,C4,C7,C8____0.1uF 50V-0.22uF 50V Ceramic capacitors
C5,C6____100uF 25V___Electrolytic capacitors
T1___Transformer 15V CT 15V or 18V CT 18V 0.5A to 1A

How to builds this circuit.
This circuit is easy so can assemble on perforated board or Universal PCB board. as Figure 2

Dual Power supply regulator +15V -15V 1A by IC 7815 & 7915

and can see video testing circuit.


If you think that This circuit is not good enough. For your work. It is hard to find equipment. You do not have it now. These circuits may be viewed below. It may be appropriate for you.

  1. Dual DC Regulator 15V using C1061 and A761
  2. Dual power supply 3V,5V,6V,9V,12,15V with LM317,LM337

21 thoughts on “Power supply regulator +15V -15V 1A by IC 7815 & 7915”

  1. hello, thanks for this..

    can i replace the 12-0-12 with 15-0-15 but still getting +15v and -15v as output?

    if yes, what other components will need to replace? thanks

  2. thank you. Can you provide the complete discription of the circuit and why you use the 6 capacitor. And can you tell me the working of ic properly. And what is the meaning of the 7815 and 7915 ic. why 7815 is used for positive polarity. Thanks in advance.

  3. Thanks, I’ll use this schematic! :)

    BTW, same question as eboy, may I just use 7812/7912 to get 12-0-12 with the same circuit?

  4. Superb blog you have here but I was curious if you knew of any discussion boards
    that cover the same topics discussed in this article?
    I’d really love to be a part of group where I can
    get suggestions from other experienced individuals that share the same interest.
    If you have any suggestions, please let me know. Kudos!

  5. ola gostaria de um controlador de 15v porem com uma maior amperes, posso usar mais de um trasistor para almentar a amperagem. pressiso ligar o controlador em um painel solar de 24v 8A para carregar uma bateria de 12v 40A

  6. this shit does not work!! dont use this! i have ruined my whole power amp thanks to this idiot! screw you. check the 7915 and 7815. you fool!

  7. Hi, everybody.
    I am sorry error of transformer’s output voltage.

    We should use 15V ct 15V or 18V ct 18V.

    Thanks for all comment.

  8. 7915 connections input pin 2,,,ground pin 1,,,output pin 3,,,,7815 connections pin 1 input…pin 2 ground and pin 3 output Thanks For a Handy Dandy Little Circuit!!!

  9. @supul…Please Refrain from Cursing On This Site,,In other words BE NICE!! If You Would Check Your Data Sheets You Would Have Rectified The Problem!!! @ admin..Keep up the Great work,,,This Site is MR.OHM Approved!!!

  10. Perhaps Supul ought to check the connections….

    I do hope he relaises the pin out on the 7915 is not the same as the 7815!!!!!

    Should his amplifier be a split rail he would see ‘smoke’ should he not build the PSU right.

    WHY didn’t he check the supply was working correctly before connecting to ANYTHING???


    As for the 2,200uF capacitors, the rule of thumb you need 2,200uF per amp, so for 2 amps say one would need a 4,700uF unit.

    Any transformer less than 15V will not provide enough voltage for the regulators…. consider the diode rectifier drop and the voltage drop across the regulators as well as transformer loading.

    Any transformer greater than about 18V will cause excessive heat in the regulators.

    When running high power, certainly above about 0.5A it would be advisable to use a finned heat sink on the regulators or at least bolted to a sheet of aluminium – remember the 7915 will need to be isolated from earth because the tab/ middle pin is the -Ve output.

    DO REMEMBER the connections of the 7915 IS different to the 7815…. and the above supply does work!!!

  11. I have a Behringer RX 1602 mixer that is motorboating intermittantly. The LED lights blink off and on when this happens and the speakers pop very loudly. It has a 7915 and 7815 ICs. Could it be one of these or one of the filter caps? There are 4 caps. The values are hidden from view. Two are larger than the other two and there are 4 disc caps. Can you please advise me ASAP. THANK YOU.

  12. What would cause loud “motorboating” in the speakers ? If a capacitor, which ones most likely OR could it be the 7915 or 7815 IC ? Thank you !

  13. meu compresor de audio behriger modelo mdx4600 queimou otransformado otransisto ic7815 e ic7915 são afetado

  14. Using 7815 and 7915 I am not getting perfectly 15 volt or-15 volt ….
    My circuit output is 16.43 and – 17.32 ….
    So what will change require in my circuit????

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