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| 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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