Electronics > Projects, Designs, and Technical Stuff
Extremely weird issue with op amps!
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Kleinstein:
To make that type of circuit stable one could add a resistor from the amplifiers output to current regulator feedback pin and than have a capacitor in direct feedback at the current regulating OP. This way only the low frequency signal goes through the amplifier, the high frequency AC part is directly trough the capacitor. This also avoids the possible delay from the transistor to cause trouble.
OM222O:
can you please provide an schematic? I'm not sure if the capacitor is directly on the output of the current controlling amplifier or if it's after the resistor?
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