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:

New Circuits

.

 


Popular Circuits

H Bridge Direct Current Motor Control Circuits
Model Railroad OdometerCar
Air Model Finder
Delay circuit for a long time periods ( 4060 )
Crystal oscillator
Electronic mosquito repeller
network rs232
infrared emitter and detector using ic 74ls14
Kit Car Design & Build
TV preamplifier circuit
Conversion using LM555 timer circuit diagram



Top