Revision history of "File:Plant board top.jpg"

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  • (cur | prev) 08:11, 19 September 2013Ralph Benadski (Talk | contribs). . (574 bytes) (+574). . (The board was a bit small for this project, but all fits. The whole thing uses the magic of the 4093 (a quad, dual input, Schmitt-trigger NAND port IC). It feeds the feelers (green pins) with a low current AC, then checks whether or not the voltage is hig)