I read with interest the dialog on protecting the ADIO digital output from relay coil voltage surges (thanks hult and catsandi). It seemed to me an opto-isolated relay would be the solution. Probotix offers their RBX-1 3-channel board for $33. The three optical inputs are 5VDC with common ground which seems to be a good match with the ADIO.
So would this be a safe relay driver solution?
I'm also concerned by the ADIO's common ground which is connected to the serial ground which is connected to the computer's serial ground which probably is connected to the computer's power ground which is connected to main's ground. Even though my computer has available serial ports, I think it might be better if I used a Serial-to-USB interface to isolate the ADIO's common ground.
Am I being too cautious or is this a worthwhile protection measure?
Thanks for assistance.
So would this be a safe relay driver solution?
I'm also concerned by the ADIO's common ground which is connected to the serial ground which is connected to the computer's serial ground which probably is connected to the computer's power ground which is connected to main's ground. Even though my computer has available serial ports, I think it might be better if I used a Serial-to-USB interface to isolate the ADIO's common ground.
Am I being too cautious or is this a worthwhile protection measure?
Thanks for assistance.
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