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

    H Bridge Direct Current Motor Control Circuits
    Class-A Tube Headphone Amplifier
    Overvoltage protection for logic
    300 Watt MOSFET Broadband Amplifier Using MRF141G
    Courtesy Lights
    Simple Twi-light using white LEDs
    ScratchBoard Emulator using Arduino Uno
    Optical Pulse Generator
    Low Tech FM Radios
    push-pull 300B power amplifier
    RING COUNTER WITH VISUAL READOUT



    Top