Early in this chain of posts, on 12/28, you will see the diagram. Only difference is that instead of AC running through a rectifier I am pulling from a 3 amp 12 vdc power pack.
thanks
Jbb posted:Early in this chain of posts, on 12/28, you will see the diagram. Only difference is that instead of AC running through a rectifier I am pulling from a 3 amp 12 vdc power pack.
In your earlier diagram, what you call the common "Ground" outer rail is drawn with breaks shown above with red arrows. I don't think you want those breaks as you'd always want "Ground" available on the common rail.
So as I understand it, you have replaced the "rectifier" and are now applying 12V DC from an independent/isolated power pack like a wall-wart as shown above. In today's post, you don't explicitly say that you hooked the minus side of the 12V power pack to the common Ground rail.
After confirming above two issues, it seems you can use the DC-mode of your meter to see where the ball gets dropped in completing the circuit.
Note that you don't even need to power-up the AC track power transformer to debug what amounts to an independent 12V DC relay circuit. They are two independent "systems" simply sharing a common "Ground" connection.
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Stan, you nailed it. I had not connected the minus side of the DC power supply to the common. I really appreciate the help - thanks
