Two way Simple Very Small Telephone Exchange


Posted on Feb 5, 2014

This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition, Exchange will detect it & send ringing pulse to other phone. When it will be picked up, the connection will be established between both phones. This will be taken place vice


Two way Simple Very Small Telephone Exchange
Click here to download the full size of the above Circuit.

-versa. This circuit is base on PIC16F84A microcontroller. Two slimier SLIC are connected to The controlling unit. It needs to identify following connections on the controlling unit circuit diagram. This unit is required to detect every status from an usual telephone set for the Controlling circuit ( Exchange ). It interfaces an usual telephone to the controlling circuit. Two slimier SLIC are required for this project.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Shorty Forty Antenna
    Wide range oscillator
    Electronic-photoflash
    A 12 Volt Switching Power Supply
    clock driver for sparkfun easydriver breakout
    kode kunci satu transistor
    CM2 Practical
    toggle switch using 555
    Mains clearance in a TRIAC driver
    Battery SaverCircuit
    why have my power dooe locks lost the power to operate correctly
    The FSK modulation circuit composed of 74LS74
    Speaker Mic Circuit



    Top