| Electronics > Projects, Designs, and Technical Stuff |
| Simple DIY Linear PSU |
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| 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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