pete1990

hey, thanks for your answer. I'm sorry, it's R7 I was talking about...my mistake. I will have a look at the 33 Ohm resistor and I'm using the original shematic (). peter

hey, first up thanks for sharing that project. I just recently build up my second version of the circuit, due to a failure of my first one (which wasn't looking too nice anyways...). And here is the reason why I'm writing here: The Power Supply is almost working perfect, but there is a thing what I can't explain to myself. The regulation of voltage works fine. The regulation of current works as well, but if I turn the current pot all the way left (minimal current) the current limiter LED turns on (although there is no load at all connected). It doesn't matter in what positions both Pots are, my selfmade Volt and Currentmeter measures a small current from less than 10mA. That current is mesured and calculated over the voltage over R5. If I measure the Voltage over R5 with my multimeter I always have a small negative Voltage (about -30mV; thats probably why the Limiter LED is on and the Outputvoltage is Cut to 0V). Do you have any Idea at which part of the circuit I should begin to look for that bug to get it fixed? I've made a short video clip to visualize the problem: best Regards, peter