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Re: Schematic for Velleman MK138 Temperature Controller Boar

Posted: Sun Mar 24, 2013 1:41 pm
by thosj
No voltage on the other end of the relay, this with nothing but 12vdc into the board, red led on, relay clicked when powered, no sensor, no output connected. Should I have 12vdc on the backend of the relay at this point? Wouldn't I NEED 12vdc on the back end to make it trip/click? So I wonder where to start checking for "operator error"? I guess I'll get the schematic out and try to trace thru and see if I have a diode backwards or something. I have all the black bands to the white band on the board, my interpretation of how it goes.