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DC Power supply 0 30v 5A, Adjustable regulator

This is DC Power supply 0 30v 5A, an Adjustable regulator is special that the output to 5A current. It uses LM723 DC voltage regulator IC + 2N3055 power transistor x2 to increase current up. So do the current too much than this circuit (easy circuit)

To use transformer 5A, Transistor 2N3055 to Hold Heatsink, VR1-5K to ADJ Volt Output.

circuit Diagram of Regulator 0-30V 5A by IC LM723 & 2N3055 x 2

Circuit Diagram of Variable Regulator 0-30V 5A using LM723 and 2N3055 x 2

One of our most popular a power supply circuits is the variable voltage regulator 0-30V 2A.
However, because someone wants to work at higher loads. Let us modify the new circuit for the workload has increased.

We do not offend you, In this Power supply circuit 0-30V 5A is adapted to the work
direct follow want of all of you.

This circuit is still the principle original everything. Just only changes the current limiting circuit. by use the resistors 0.1ohm 5W two pieces for the parallel, to be able to withstand loads as wanted.

We should not forget, use the resistor size 0.1ohm 5 watts amounting 2 pieces to parallel each other
Then, connected to the emitter of the two 2N3055. To offset features that might be slightly different, these two transistors.

To create just operators device in a PCB form and then to make correct completed is available. Without you have adjusting customized at any the circuit.


PCB Regulator 0-30V 5A by IC LM723 & 2N3055 x 2
Source: PK kit Circuit book


This Post Has 35 Comments

  1. Tanks . is good

  2. hi,
    can someone please modify it for 10 and 20amps, and how can i control the lm723 voltage through PIC by pwm .

  3. This is good and works. There are a few hicks up though – Whent eh voltage is beyond 20V, the IC starts heating up – the solution would be to replace the R4 resistor with a higher value. Also, when you make the pot zero, the output voltage still shows as 0.5~0.7 V. The solution could be to use a volatge doubler – a negative one and provide a -VCC as reference.

  4. Hi all I wonder if this can be modified to circito 50V amperage is ok hugs greetings Daniel

  5. Hi,is possible modifild for this circut for 0-16V. 10amp? thank you

  6. Thanks,it works.But as Sunlkumar said, when the voltage is above 20,the IC heats up.Exactly What higher value of R4 should I use?please help

  7. I feel so amazing to explore you experience in your site…please can you show me a easy way to test a power transistor?

  8. pls am having a challenge in steping down 5A to 1A using lm317T pls its really urgent and i will be so thankful, if you can assist…..

  9. First time I turned it on it worked. But then the R4 start to burn, smell and the voltage stayed at max. I tried to replace this resistor with a 10k and a 100k. But the voltage still stays at max. Do you guys think that the IC has been burned because the first attempt with the 100ohm R4?

  10. Is over load protection is available in this circuit

  11. R4 = 3.3 K

  12. R4=3.3K
    PCB be modified

  13. Hi, xdisc
    Thanks for your feedback.
    Your job is good.
    If your project finished.
    Please share us to appreciate them.

  14. Hello!
    The supply is 24*5=120W. But your supposed output is 30*5=150W. The law on energy is not valied here. Why is it???

  15. i want to ask
    1.what is the wattage of other resistors ( R1-R8)?
    2.which substitute can i use instead of BD140? because it is not available in market here.
    3. for 2n3055 heat sinks are required?
    thanking you in anticipation.

  16. I need more explain for these circuit like ( a calculation ,the graph ,and something like that……) . Also how it’s work . please
    I’m waiting for you ……

  17. I implemented this circuit and it worked properly. Thank you! Could I use it to get a negative voltage? How?.

  18. i need the proper serial code for the diode it is mention as (10A).please help me .

  19. please help me i was also implemented this circuit, but when i adjust pot the voltage does not change, it remains at peak (35V),please help me……..,

  20. but volatage is not varying wat can i do to vary volatage.

  21. please help me i was also implemented this circuit, but when i adjust pot the voltage does not change, it remains at peak (35V),please help as soon as possible

  22. Hi
    I can not tell exactly how to solve this symptom.
    The circuit seems to has only current adjustment.
    The voltage adjustment pin is 5.
    There should be a potentiometer connected there.
    Instead there are fixed resistors.
    If You like to experiment, deleted r2 and r3.
    Take a potentiometer 5kohm and a resistors 390ohm.
    Connect one edge of pot to pin 6
    Connect middle pin of pot to pin 5
    Connect the other edge of pot in series with the 390ohm resistor to ground.

    Good luck

  23. Hi
    I built this power supply, and it works just fine, doesn’t go down to 0 vdc, but about 0,4 vdc, that’s good enough. What I would like to know is how can I overload protect, the circuit, as I have already blew one LM 723 IC.


  24. Dear all,
    Can any one please tell me the “value or any identification number” of bridge rectifier in this circuit.

  25. Friends please help to make a 30 Volt,15 Ampere vriable dc voltage regulator power supply,can you suggest a circuit with specifications.

  26. You ѕhould takе part in a contest for оne of tһe higһest quality websites on the internet.
    I’m gooing to highly recommend tһіs web site!

  27. Hi Bernard,
    Thanks for your feedback.

  28. Pcb size

  29. How Mani size this pcb

  30. thanks..

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