Off line Telephone tester


Posted on Feb 7, 2014

Off line Telephone tester. Here is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. The circuit is so simple that.


Off line Telephone tester
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    MCU controlled Bluetooth automation
    Bots Circuit Designs
    accurate reaction timer
    On-off Infrared Remote Control
    High impedance DC voltmeter
    Vu meter stereo circuit
    Astable multivibrator in an 8 pin PIC
    Interfacing to Sony Cameras
    Parking call alarm circuit
    LM1877 amplifier having a control circuit diagram of the bass



    Top