Reply to "Sourcing Block Control Components"

stan2004OGR Forum Member

Jbb posted:
Don't I need DPDT - one pole for the signal light, the other for the train power?!

Not necessarily. It sounds like you're considering a 12VDC supply and isolated outer-rail block occupancy detection. And you're considering red/green LED signals? In the same way the relay gets 12V DC when occupied, that same switched 12V can turn on a Red LED while turning OFF the Green LED (which is normally ON). This can be accomplished with a 25 cent solid-state circuit (and SPDT relay) rather than requiring another pole (DPDT relay).

I'm not suggesting you go this route but simply answering your question.

12/30/1511:35 AM

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