Hi! I'm messing around with an instrumentation amp board i'm designing, and I'm using an op amp to buffer the Vbias set by dividers.
The problem is, the op amp outputs WAY too high a voltage. It's set up as a unity gain buffer, but outputs 3,something volts with a 0.5v input.
I've tried different single op amps i had lying around (to rule out bad parts, and since the op amp choice wasn't that critical), I've tried an LM741, CA3100, and TL071, the latter throwing my voltage all the way up to V+! (24V).
The only logically thing being able to cause this over multiple op amps is that the feedback loop is open, or high impedance, but it ohms out ok. I've checked extensively for wiring faults and solder bridges and such, don't think that's the problem.
It shouldn't be a complex circuit at all, and I'm out of ideas to try. Help.
See attached schematic.
Thanks in advance!