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Help with how this PSU works. (With revised design)

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Evangelopoulos Panagiotis:
Greetings everyone again,

It's been a while since I've done anything with this power supply. My desire to create a somewhat decent linear power supply was postponed due to recent events.

I integrated some of the changes that were proposed:
Added: 4 parallel TIP35C
Added: Ballast resistors
Added: Output protection diodes
Added: 10R base resistors

I have a few questions before I go on and create the PCB.
-I changed the 1k pot that controls the current to a 10k one because that's whats mounted on my project box. I'd rather not change it because it has an integrated switch in it. Can I do that?

-I want to add a green LED that will turn on when the output voltage is at the desired level. Will adding a LED on the output of the voltage Op-Amp, same as the current one, do the trick?

-Have I messed up the output protection?  :P

Once I'm confident enough with this design I'll make the project public and paste the link here incase someone would like to build one themselves!  ;D

Thank you all in advance,
E.P.

xavier60:
Don't make a PCB yet. The way I see it, the CC is sensing output voltage and the VC is sensing nothing.
Ill look for example schematics.
Most designs put D10 between the output and the Collectors of the output transistors to protect them from an external voltage source being connected while the PSU is powered off.

aheid:

--- Quote from: xavier60 on May 12, 2020, 09:56:18 pm ---Don't make a PCB yet. The way I see it, the CC is sensing output voltage and the VC is sensing nothing.

--- End quote ---

Looks like the LTSpice sim I made above, unless I missed something?

Evangelopoulos Panagiotis:

--- Quote from: xavier60 on May 12, 2020, 09:56:18 pm ---Don't make a PCB yet. The way I see it, the CC is sensing output voltage and the VC is sensing nothing.

--- End quote ---

The output positive is connected to the 0V label which is also connected to the inverting input of the VC Op-Amp.


--- Quote from: xavier60 on May 12, 2020, 09:56:18 pm ---Most designs put D10 between the output and the Collectors of the output transistors to protect them from an external voltage source being connected while the PSU is powered off.

--- End quote ---


I didn't quite get that... :-[

xavier60:

--- Quote from: aheid on May 12, 2020, 09:58:28 pm ---
--- Quote from: xavier60 on May 12, 2020, 09:56:18 pm ---Don't make a PCB yet. The way I see it, the CC is sensing output voltage and the VC is sensing nothing.

--- End quote ---

Looks like the LTSpice sim I made above, unless I missed something?

--- End quote ---
I can't see the labels clearly. Can you post it with higher res?

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