telephone call voice changer

Posted on Feb 6, 2014

This design fulfills these requirements by means of a variable gain microphone preamplifier built around IC1A, a variable steep Wien-bridge pass-band filter centered at about 1KHz provided by IC1B and an audio amplifier chip (IC2) driving the loudspeaker. 1) The pass-band filter can be bypassed by means of SW1A and B: in this case, a non-manipulat

telephone call voice changer
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ed microphone signal will be directly available at the line or loudspeaker outputs after some amplification through IC1A. 2) R3 sets the gain of the microphone preamp. Besides setting the microphone gain, this control can be of some utility in adding some amount of distortion to the signal, thus allowing a more realistic imitation of a telephone call voice. 3) R9 is the steep control of the pass-band filter. It should be used with care, in order to avoid excessive ringing when filter steepness is approaching maximum value.

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