Water Activated Relay


Posted on Nov 28, 2012

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.


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




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

WinBode
Flashing LEDs toy with 555
1.2GHz Voltage Controlled Oscillator With Linear Modulation
fADC Amplifier Circuit Simulations
universal battery charger schematic
Monostable multivibrator
Fire Sensor Circuit
A hi-fi amp around 01
ISO102 and OPA27 schematic configuration measuring DC current 500VDV



Top