Electronics > Projects, Designs, and Technical Stuff

Simple DIY Linear PSU

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Kleinstein:
Combining different power transistors in parallel is not that great and would need more emitter resistance.


The BD241C should be OK, at least for lower power (about 20 W per transistor).

Less current and only 1 transistor should be OK too.

panoss:

--- Quote from: xavier60 on March 14, 2020, 01:02:52 pm ---I notice that the voltage has been dropping by about 2.5V per amp of load. There could be a wiring mistake.

--- End quote ---
I 've split it in two PCBs, in the attachment you will find my Eagle (7.7.0) files:
1. main pcb.
2. power section, contains the power transistors' section

panoss:
-I removed the BC557 so now Q2 = S8550
-I removed the D209Ls and I put one D1408

I get the same measurements.

I use an LM358. It's voltage at pin 8(in respect to pin 4) is 9.69V.
With or without load.

iMo:
OT: It has been demonstrated many times here the LTspice gives pretty good results with DIY linear PSU simulations..  :-+

xavier60:

--- Quote from: panoss on March 14, 2020, 02:49:20 pm ----I removed the BC557 so now Q2 = S8550
-I removed the D209Ls and I put one D1408

I get the same measurements.

I use an LM358. It's voltage at pin 8(in respect to pin 4) is 9.69V.
With or without load.

--- End quote ---
What are the CV op-amp's input voltages for the 3 loads? Also Q1's Base voltage.

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