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Very nice solution! So what you're saying if I understand correctly is that I can use the signal from one of the existing relays to trigger a PNP transistor, thereby supplying the bias voltage to the circuit? No third relay required?

Also, wouldn't the transistor need to be somewhat heavy duty, like something in a to-220 package with higher current handling capabilities?

[QUOTE="eagle1911, post: 265228, member: 17129"] Very nice solution! So what you're saying if I understand correctly is that I can use the signal from one of the existing relays to trigger a PNP transistor, thereby supplying the bias voltage to the circuit? No third relay required? Also, wouldn't the transistor need to be somewhat heavy duty, like something in a to-220 package with higher current handling capabilities? [/QUOTE]

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