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Galvanostat using AD711

Question asked by Damaso on May 3, 2012
Latest reply on May 8, 2012 by Damaso

I'm designing a galvanostat using the simple AD711 as a start. I simulated the circuit using Proteus and everithing seems to work just right.

When I try to build it, The output of the U1 opamp goes to full scale (negative) and the non-inverting input raises from ground a few volts. This is my firts try with control loops, so I don't know if I'm doing anything wrong. Should I start the circuit in a specific way just to ensure the stability of the loop? Any specific value for the capacitor (tried 100nF, 10nF)?

Thanks for your time