I'm having a bit of a hard time diagnosing a problem with a circuit I have just soldered onto stripboard, the circuit works perfect in simulation.
The scenario is that I have a circuit with a few opamps and transistors and am using a lab power supply in series to provide +- voltage rails.
If I connect positive and ground to my circuit everything seems fine. In terms of the power supply. However if I connect the negative rail to the board then the supply that's providing the negative rail trips and goes into CC mode, the voltage on the display drops from 12v to around 0.1v (I can't remember the exact but its low), if I remove the negative rail connection the supply restores and comes out of CC mode.
This happens with both just ground and negative and positive and negative connected. So the problem is with the negative rail / connection.
However, when I test with my multimeter on the continuity setting, there is no beep when I touch the ground and negative or positive and negative. So this to me means there's no short?
So I'm not sure what I'm looking at or what the problem is...I assumed the power supply going into CC mode meant there was a short somewhere but I can't find anything and I'm not sure why its happening for both ground and positive rails.
This still happens when I remove all the opamps from the chip holders so theres no shorting happening through a potentially dead opamp.
EDIT: added schematic photo. Also another thing I discovered is that when I do a continuity test from the black dot and the ground rail I get a beep.
Testing is so done with pin 3 of the first opamp disconnected.