basic circuit troubleshooting question

[electrohobies]

I am troubleshooting an op amp based circuit and I notice that the PS drops on the negative rail from -15 to about -9 volts when I power up the circuit. on the other hand the positive supply stays the same (15V). is there a reason behind this issues? could the op amp be damaged and its loading the PS?

Thank you

[xrunner]

could the op amp be damaged and its loading the PS?

Schematics are helpful, but does the PS drop if you pull out the op amp?

[electrohobies]

I did not pull out the opamp just wanted to know if this is an ok behaviour?

[xrunner]

I did not pull out the opamp just wanted to know if this is an ok behaviour?

I was implying by my suggestion that there was indeed a problem to troubleshoot - but no it's not OK at all. 

[StillTrying]

Sometimes just some -Ve supply is needed for an opamp circuit so that its inputs and output can work near 0V, and it doesn't matter too much whether it's -15 or -9 volts. But without the schematic who knows.

[UnkleBidii]

I would test the supply on another load. If it drops on that load then there is an issue with your power rail.