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Subject: Re: Seperating Ground lines

Date: 12/19/02 at 7:07 PM
Posted by: David
E-mail: david@project2000.com.au
Message Posted:

In Reply to: Re: Seperating Ground lines posted by Russ Kincaid on 12/19/02 at 2:13 PM:

I have a step down transformer providing one level of voltage to drive a set of motors, and an SMPS source providing voltage for the logic control (MCU, etc). At which point do I make the grounds common without having to be too concerned with noise coming back off the motor circuit (with MOSFETS) and back into the MCU (the concern here is that the noise may appear as an input and switch another motor). I do have an opto-isolator separating the two circuits, each side with a different ground reference. Is my problem at the opto, and if so what do you recommend to do?

David.


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