Electronics > Projects, Designs, and Technical Stuff
Simple DIY Linear PSU
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panoss:
Also it has no BAT85, so I put BAT42. It 's the D5.
panoss:
Ok, I managed to simulate it!

I use TL072 as for LM358 Proteus has no simulation model.
I 've also replaced D45H11(Q2) with a BD912 because D45H11 has no simulation model.

I power it with a voltage source, 30V.
I put the CV Pot in the middle, CC Pot on the top (max current).
These are the results:
RL=30 Ohm, 0.47A, 14.2V
RL=25 Ohm, 0.57A, 14.2V
RL=20 Ohm, 0.71A, 14.2V
RL=15 Ohm, 0.94A, 14.2V
RL=10 Ohm, 1.40A, 14.0V
RL=5  Ohm, 1.56A   7.8V

Conclusion: It cannot give enough current.

I have uploaded in .pdf (change it to .pdsprj) and in zip format.
xavier60:

The BD912 likely has low current gain. Try a BD138-16 for now.  Most of the BJTs I tested with  had gains of 200 and more.
The D45H11 has unusually high gain for a large BJT.
The voltage at the Base of Q1 should be checked during testing to get an idea of how much total gain the output path has.
panoss:

--- Quote from: xavier60 on March 06, 2020, 10:48:05 pm ---.Try a BD138-16 for now.

--- End quote ---
It 's not included in Proteus' libraries.
xavier60:
The design on  mike_mike's thread uses a BD244a. Check what the modeled current gain is.
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