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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Alternator Monitor (CB15050E)
The purpose of this circuit is to monitor the operation of an alternator in cars with a 12 V...
Up to 8 A x 12 V Charger (CB13546E)
This circuit is from a 1974 technical documentation. The publication deals with applications of...
Variable Attenuator (CB14144E)
The circuit shown in the figure was suggested by National Semiconductor in its 1994 Linear...