Originally posted by nvisser
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Vissie,
I'm beginning to believe that the whole point is not to have the grounds connected at all...only for very brief moments in time.
To answer the question asked, YES, the SCR is the main switch on the negative and it is a potential switch in JB's circuits, but it works in conjunction with the opto and transistor in a darlington arrangement.
For what it is worth, if I were doing what you are doing, I'd switch the negative and not the positive.
Leroy
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