phone cut circuit


Posted on Feb 7, 2014

A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in Electronics Now. When the circuit detects that a phone line has been cut, it activates a MOSFET which can be used to drive a relay, motor, etc. It can also be connected to a security system. If the circuit is


phone cut circuit
Click here to download the full size of the above Circuit.

connected to a security system or other circuit, both circuits must be electrically isolated from each other using an opto-isolator, relay, etc. This also means that the Cut Phone Line Detector must be powered by a seperate 9V supply.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Electronic Night Light
    Mobile voltage regulator
    Precision buffered reference
    simple-amplifier-with-c945mje340-and.html
    Exterior LampCircuit Of 1998 Chevrolet Blazer
    Very Low Dropout Adjustable Breadboard Power Supply
    Geerts clock
    Inductor saturation tester alternative route to dump the excess energy
    VOX Circuit
    A Dozen Small Battery-Powered Alarm Projects
    DC Motor Tutorial
    Lantern controller circuit diagram of a non-contact



    Top