Telephone Scrambler Circuit

Posted on Jun 16, 2012

Two hybrids (Tl and T2) are used to allow direct connection to a telephone line. This circuit uses the common speech-inversion algorithm where the frequency of an audio signal is inverted about a center frequency.

Telephone Scrambler Circuit
Click here to download the full size of the above Circuit.

An LM1496 balanced modulator is used to heterodyne the speech range against a 3.58-kHz signal.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Roulette with LED Display
    Car temperature indicator circuit
    Flip-Flop Debouncer Switch
    My Arduino In Circuit Programmer
    Simple Calling Bell Using an Intercom
    smart phone light circuit diagram
    An op-amp made from 555 chips