wkt

Yes indeed, I fixed the V pot to ~2V (at pin 3 of U2) which gives me an output of 6V (at pin 6 and main output), when I'm connecting the load the output drops to near 0V, and the output of U2 goes high (~9V from 12V supply) while the input voltage stays the same. I removed everything although I can't seem to find it easy to figure out because the U2 op-amp has a feedback loop and while I suspect that the op-amp is broken and i have to replace that next, I'm also thinking of some adjacent components like the small capacitors. EDIT: I discovered that I had the diode D9 damaged, acting like a short. Removed it and the output now drops only a few volts when connecting the load. FInal EDIT: I've put everything back on and it works ok. The problem was that shorted diode. Thank you for helping me.

Hi there. I assembled a kit of the v1 of this power supply and did a stupid mistake: I wasn't paying attention and I powered the board through the output, so 24VAC went trough the protection diode and smoke came out, I disconnected as fast as I could but damage was done. First I thought that only the diode broke so I replaced it and powered it properly but it doesn't work properly. The voltage adjust works fine all the way from 0 to the top range. The problem arises when I connect a load to the output. then the voltage drops to under 2V I started troubleshooting the circuit with U1 and I get the output voltage of 2x5V1 which is the zenner diode used by this kit. Also on the negative rail uses the same zenner diode and the voltage is 5V1. Then I removed U3 and disconnected the reverse series diode D9 that makes the connection from the current regulator side to the voltage regulator side so that only voltage regulation is active. The problem remains the same, loading the output with significant load (1R / 10R) makes i drop to under 1V. I then proceed to replace the transistors and even let only one of them, the 2N30055 in place to eliminate more components. I have gotten to no result. I can't think of anything else that the op-amps to be damaged. Any thoughts? Thanks