I'm testing 0-30v power supply based on this circuit

http://www.electronics-lab.com/proj...-power-supply-with-current-control-0-002-3-a/

I'm using it without transformer and feed supply voltage from my bench supply to circuit. Because i can get only positive voltage from bench power supply I use 555 negative voltage generator to to get negative voltage to op-amps. When I try to use same power supply to circuit and negative voltage generator nothing works. I set bench power suplly current limit to low 0,05A value and current limits comes on immediatly when i connect wires.

But when i use separete battery to power up negative voltage generator everything works. Maybe it's some stupid mistake i'm making. Is it even possible to use bench power supply to get +15 and -15v using negative voltage generator? Drawing attached to post which explains my wiring connections.

 

Now I found the problem. I set bench power supply current limit little bit too low. Stupid mistake

 

Turn your current limit up to 1 amp, if it works on the battery then the circuit is ok.