Electronics > Projects, Designs, and Technical Stuff
Simple DIY Linear PSU
panoss:
I did the test and everything seems normal.
I saw no increase of the output voltage.
I plug it in, set the Vout=1V, unplug it. It stays for a few seconds at 1V and then gradually, in a few seconds, decreases till 0.
Till now (I have tried a few things) it works VERY WELL!
xavier60:
That's good to know.
panoss:
This is thanks to you Xavier, thank you very much.
Have you build it or I 'm the first?
xavier60:
I built the design into a working bench supply some time ago. The circuitry around Q1(Q2) is a little different and it relies on a micro-controller to shut off the output when the mains is switched off. It uses a higher performance TLC072 op-amp which does not have much benefit.
Actually, using a TLC072 or other types in the current design might cause a mild voltage spike during power down. It would need testing.
https://www.eevblog.com/forum/projects/linear-lab-power-supply/msg2388873/#msg2388873
As far as I can tell, mike_mike 's implementation of the design worked out well also.
panoss:
Hi again.
I have a problem with the PSU: I short circuited the output and something was burnt (I saw some (very little) smoke).
Since then it only outputs the maximum voltage (20V).
I checked every component one by one: I desoldered one pin from every diode and checked them, I desoldered Q1 and checked it, I desoldered Q2, Q3, Q4 (they are in a separate schematic & pcb, not seen in the attached schematic) and checked them.
I measured every resistor, they all are ok...
I even checked the LM358 as per these suggestions, it 's ok.
These are the voltage measurements, input voltage is 20V, any help is more than welcome:
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