Schematic for Velleman MK138 Temperature Controller Board

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Joined: Mon Mar 26, 2012 8:22 am
Location: Greenville, WI USA

Re: Schematic for Velleman MK138 Temperature Controller Boar

Post by thosj » Sun Mar 24, 2013 1:41 pm

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.

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