Modifying the Relay boards

I had to modify the Relay boards – The relays were getting VERY hot.  Turned out to be a fault in the design – the 5V relays were being run from the 12V supply.  Simple fix to cut a trace, and run a wire to the output of the on-board 5V supply.  I guess that explains why they were $6 a board 🙂


And a quick look at the half-finished Relay driver board!  That’s 6 x 74HC255’s and 6x 74HC244’sIMG_3054

Leave a Comment