Bench Power Supply Question

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snm_za

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I found this schematic and want to build Bench top power supply, but as I’m beginner I have some questions to ask so any suggestion is welcome!

I found on Youtube something that I would like to build
https://www.youtube.com/watch?v=denryjAvtDA Try to contact him but no success

SO...

1. If I add more power transistors or change type for example 2n3772 Can I get more current (10amp)

2. I think that is possible to use PIC to control LM 741 and can anyone help me with advice how to do that? What should I do with LM741 inputs-to get 0-30v and 0-10A
(schematic explanation .. suggestion)

3. Is it worth to try :roll:

In attachment schematic that I would like to modify…


First step completed I purchased transformer 220V/30V-10A/15V-2A

View attachment PowerY.jpg
 

Hello My friend !
Your circuit is ok and and i think it will work fine .
and about adding transistors : you can add some transistors to increase ability of giving higher currents , but don't forget to increase the beta of your driver and use more 2n3055 , in parallel together .
And it has current limiter and voltage controller , so you should decrease the sense current resistor or increase the compared voltage of limiting amplifier to increase the current .
By the way , i have many circuits of power supply , if you want i can share them with you .
But your original circuit is good too ( about 5 years ago , my teacher analyzed it for me , and it seems incredible .)
Best Wishes
Goldsmith
 

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1) Yes, you can get more current. You should parallel transistors to spread out power dissipation so that each transistor dissipates less power.

2) Yes, you can use a PIC or other microcontroller. But for that, you would need to be able to program the microcontroller. Have you programmed PICs before?

3) Making the project - why not? Using a PIC for the control - depends on your level of expertise in PIC. But, since you say you're a beginner, I assume you don't know much about PICs or programming them. In that case you shouldn't use the PIC.

Hope this helps.
Tahmid.
 

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