Electronics > Projects, Designs, and Technical Stuff
My First Power Supply
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rpetitho:
Hi all!

Long time viewer of the EEVblog and reader of the site, first time poster. I've been working on my first power supply and decided to post what I came up with for version 1. I was feeling confident and sent the PCB to the fab shop so we will see how it works.  I'll let you all know!  You may find some extra cap slots on the board. I put in a few extra to experiment a little when the boards show up. 

A little about myself. I have a background in civil engineering, but then I decided to become a pilot. So I haven't done engineering work in about 10 years. Getting into electronics has been lots of fun and I hope to keep learning. Let me know if I bust any forum protocols, not intentional.

-Bob
queennikki1972:
If it works out I'd be interested in a printed pcb. My current LM338 board doesn't have current adjustment as Im a new hobbyist.
MarkF:
As a comparison, I did a similar design some time ago (never built it though).
The only real difference is that my voltage can not go below the minimum of the LM317/LM338 (i.e. 1.25V).
Let us know how yours works.





Zero999:

--- Quote from: MarkF on October 02, 2019, 02:23:14 am ---As a comparison, I did a similar design some time ago (never built it though).
The only real difference is that my voltage can not go below the minimum of the LM317/LM338 (i.e. 1.25V).
Let us know how yours works.
--- End quote ---
Did you simulate it? It requires some frequency compensation, otherwise it'll oscillate.

All it needs to go below 1.25V is a negative rail.
MarkF:

--- Quote from: Zero999 on October 02, 2019, 09:37:14 am ---
--- Quote from: MarkF on October 02, 2019, 02:23:14 am ---As a comparison, I did a similar design some time ago (never built it though).
The only real difference is that my voltage can not go below the minimum of the LM317/LM338 (i.e. 1.25V).
Let us know how yours works.
--- End quote ---
Did you simulate it? It requires some frequency compensation, otherwise it'll oscillate.

All it needs to go below 1.25V is a negative rail.

--- End quote ---

I did nothing except layout the circuit for another discussion some time ago as a starting point.
I did not care if it went to zero.  It was worth not having the extra circuitry for the negative rail.
"I don't simulate.  I build the real thing and test."

Show me what you think it needs? (for others if not for me)


I actually have four of these small HP Power Supplies (three 25V and one 50V):
   
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