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Reply to "Instructions for MTH block signal"

Many LED's probably wont light with a single AA cell.  I'd use a 9V battery with a 1K resistor in series, that will light any common LED.  The fact that the PCB is obviously missing means they're probably just bare LED's in there.

Good point, I was leaning to bulbs…as I thought it was mentioned. I have a 9v with resistor and alligator clamps for testing.

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