Water Activated Relay circuit board

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

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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