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Subject: Opto, ground plane and power supply

Date: 08/22/03 at 5:04 AM
Posted by: David
E-mail: djdav[AT55]free.fr (replace [AT55] with @ to reply)
Message Posted:

I have a measure I want to isolate that's why I'm using an opto (HPCL7840). On the measure side the opto is supplied by 5V and floating ground. On the output side, the opto is supplied by another 5V and mechanical ground. Then the + and - output of the opto are connected to the + & - input of an opamp used as a differential amplifier. Furthermore my board has a 0VA ground connected to the mechanical ground by an small inductor. Which ground should I use
- for the opamp supply ?
- for the resistor which is connected to the ground used in differential schema with opamp ?
- for the opto (output side) supply ?

Hope I've been clear ...

Thank for any help

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