Linear optocoupler for instrumentation

Posted on Jan 16, 2013

A dual optocoupler is used in a configuration which has the same current throughout as the LEDs. Assuming similar optocoupler features the output voltage must be equal to the non-inverting input voltage. Since the op amp is within a closed loop the output voltage becomes equal to the input voltage.

Linear optocoupler for instrumentation
Click here to download the full size of the above Circuit.

Rc and C perform as a compensation network to prevent oscillations.

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