BennoRausch

Hi Audioguru! First off all: thanks for your fast reply. I didn't want to be impolite but I messed up my thread above because I didn't know how to quote properly. I hope it will be better next time! So long Benno

Hi everybody! Audioguru, your're doing an excellent job! Thank you very, very much for your commitment! I'd also like to built this PSU and understand how it works. As far as I can see there were lots of changes by the component values but the circuit's topology stayed the same except the additional resistor Rl. I've read the function description, but I still don't understand half of this circuit I think.Now here are my questions: 1.This additional resistor Rl forms a load that is needed for correct function of the regulation even if no external load is connected? 2.What is R1 good for? Why is the smoothening-capacitor C1 not enough? 3.Why 15W for R7? With P=R*I^2 and a max. current of 5 amps follows a max. dissipation of 6,75W. Is this because a 15W resistor doesnt get as hot as a 9W resistor? Does this resistor need an extra heat-sink? The lower the value of R7 the better, because less power is dissipated in R7? 4.U1 provides a constant voltage which is amplified by U2. The output voltage is fed back to U2 by R12 (C6 is for stability?). C9 is for stability, but what are R15 (base-resistor for R13?) and D10 good for? 5. I don't know what D11 and C7 are doing. Same with D10 I hope somebody (I think it will be audioguru ;-)) can help. Bye Benno