Voice Scrambler


With this circuit you
can modify how your voice sounds by changing the pitch of your voice.
This circuit can be connected to a phone and with a duplicate circuit on
the end of the phone line, you can have a scrambled voice
communication. The way the circuit works is as follows: If we cut the
circuit in half at the T2 transformer and include the LM324 on the left
side, you will see that the LM324 portion of the circuit is a tone
oscillator which shifts the frequency of all input signals to a new
higher frequency. When the voice and the tone oscillator mix frequencies
the voice is not recognized. The voice signal is then inputted to the
second stage which again shifts the voice signal again. I recommend that
the first stage be tuned to a frequency that is 100hz lower then the
second stage.


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