I have been looking at this "need" for several weeks and - like most things I do I wanted not just to build the supply but learn more .
I want about 15 Amps out of the supply 20A would be better
I have read about the various Higher amperage regulators and about putting regulators in parallel but I really wanted to make this circuit
There are several similar ( PNP) circuits on the net and they all have the same values
I don't understand how the LM317 t controls the voltage of the by-pass transistors
The input of the transistors is Supply voltage ( 29.6) The out put is straight to the out put terminal and the base is at 29V and 296mA
Any way I can not get the circuit below ( or the six other I have built) to vary . The LM317 side works OK but as soon as I add the 2955's the output goes to 32.6V
Attachments
-
189.2 KB Views: 53
Last edited: