Circuit : Marin Lukas, Croatia
Email : firstname.lastname@example.org
A water activated relay circuit. The water or any other fluid must pass a current of 4 uA to operate the relay. Probes could be inserted into a water butt for
example to raise an alarm before overflowing.
Ovaj sklop je projektiran da ukljuci relej kada se na knotaktima pojavi voda.Tranzistor T1 moze biti zamijenjen s 2N2222A.Tranzistor
T2 mora biti BC108. Na kolektor tranistora T1 osim releja mogu biti spojeni signal injektor, LE dioda, zarulja i ostali signalizacijski
In his circuit Marin has used two transistors wired as a high gain compound pair. Transistor T1 may be a 2N2222A and T2 a BC108.
The current gain will be the product of each transistors beta, which will be a minimum of 140 x 110 or 15400. The power supply
used can be any voltage from 4.5 to 15 volts, a typical 5 volt relay may require 60 mA to operate, in which case any fluid which
passes a minimum current of 4 uA will activate the relay. This is easily achieved with tap or rain water.