Telephone Scrambler Circuit

  
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 - schematic

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




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