Water Activated Relay circuit board


Posted on Feb 5, 2014

Circuit diagram is water activated relay circuit. In this diagram circuit using two transistors connected as a high gain compound pair. 2N2222A transistors T1 and T2 may be a BC108. Current gain will be the product of each transistor beta, which will be a minimum of 140 x 110 or 15, 400. Power supply voltage can be used 4, 5-15 volts, a typical 5-vo


Water Activated Relay circuit board
Click here to download the full size of the above Circuit.

lt relay may require 60 mA to operate, in this case any fluid flow through at least 4 UA will activate the relay. This is easily achieved with tap or rain water. The following is a schematic drawing:




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