second prototype

A project log for linear bench psu

24W linear PSU loosely based on EEVblog Usupply

golfballs32golfballs32 09/29/2020 at 01:080 Comments

I've been busy working on a working prototype of the bench power supply and have made great progress. I was having problems reaching full load due to an under specced transformer and poor capacitor bypassing. I've bumped up the transformer to 36v and increased the capacitance from 100uF to more like 600uF. 

I still haven't been able to get full voltage and current out of the power supply, only 10v at 1A into a 10R load. I'm noticing a drop in the rectified voltage when under load, so I suspect that I just need more bypassing. 

With that said, I think I'm going to work on making a PCB for this project. I want to incorporate a few changes, mainly regarding flexibility. I'd like to make the board capable of being powered off of a single +12V supply, which I might accomplish with a switched capacitance converter, as the negative supply does not need much current. I may also add a capacitance multiplier or some other noise reduction device to the output for lower noise. I don't have any way of measuring said noise, but I might be getting an oscilloscope soon.