Water Activated Relay


Posted on Feb 7, 2014

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.


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

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.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Logic Probe with 74LS47
    RF Inductance adaptor for multimeter
    Negative Voltage from single positive power Supply
    Metal detector with 4030 CMOS
    get on the blinkm bus with a blinkm cylon
    Op Amp 741 Inverting Amplifier Circuit Simulation with output wave form and working
    Hacking an alarm clock
    Door Lock on Go
    Vacuum tube audio amplifier
    rs-485 circuits



    Top