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Subject: Re: Seperating Ground lines
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Date: 12/22/02 at 10:40 AM
Posted by: David
In Reply to: Re: Seperating Ground lines posted by Russ Kincaid on 12/20/02 at 2:51 PM:
Thanks for your help Russ!
We were able to look at the PCB layout given to us and found out that the schematic drawing (Protel) connected a common ground to either sides of the opto. Hence the 'floating' ground from the other supply whenever we tried running the motors. The clue was that the CRO lead was a sufficient reference for the motor power to run the motors (as its reference may have been similar to that of the MCU reference), and thus providing the motor power supply to the proper reference for both the motor and each side of the opto. Splitting the common points isolated each ground and now works wonderfully!!
I was pretty sure that I understood the basic concepts but was certainly stumped by this one, until we found out why.
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