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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144 MHz preamplifier (CB22013E)
Found in an old English documentation, this circuit is intended to amplify signals in the 2-meter ham...
Ralaxation Oscillator Using the 741 (MSB014E)
This relaxation oscillator, simulated in the Multisim Blue, produces two different signals. The...
20 dB Gain Inverter Amplifier (CB14059E
) This circuit is from an old RCA linear integrated circuit manual from 1972, but it can be...