Scanner squelch (CB9424E)

Found in Popular Electronics from the 90s, this circuit mutes a scanner's speaker in the absence of a voice signal, thus eliminating the hiss.

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1 kHz oscillator 4001 (CB16317E)
The oscillator in figure 1 can be used in alarm, call or warning systems, producing a sound of...
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This circuit was found in a 1965 General Electric manual. It is intended for cars that have...
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The component used, which is not common today, is an electronic attenuator. In this application of the...