Hi, I have made the standard PSU from the projects page, and am after some help with troubleshooting. the few changes in parts -TL081 for HA17741, which seem similar. -C1 is a 4700uF / 63V -C4 i used two 53nF -Q2 is a TIP31C, with bent legs to fit the original PCB design -Resistors are half watt, R1 1W, R7 5W -D7, D8 is a 5v6 zener tho im not sure the power rating, i can check if the problem seems to point to this -transfo is 72VA, 24VAC output -RV1 . ther is some confustion about this, 100ohm trimmer resistor, not a 100k trimpot? still not really sure what the difference is. The problem seems to be the current regulation. I can't seem to get more then 50mA out of the PSU. I can run a LED at 2V draws about 40mA. 25V bulb that is spose to run at 750mA i think, measures 33ohm, i donno if you can measure the expected current like that ? :o Draws about the same at 50mA if i set the voltage at 25V before load it goes to 8V with this bulb on it. There is a faint light. Also a 3A load, voltage drops to 0.1V or so Current pot at full off . volts measures -0.06 and the LED is on. if i turn (current pot) it up 10% or so the voltage goes up to 0 which is when the LED turns off. This is with no load. volt pot at 100% Voltage at the output is 32.00V C1 33.8V D8 5.7V I have read both this thread and the 5A+ mod thread and i did find a few things around page 20 and some interesting things around page 76 but not really anything the same as the problem i have Im just after it to actually work right before i change a few things which i do plan on. Thankx for any help.