Analog Multiplexer (CB21250E)

This low impedance circuit was found in an Electronic Design from the 90's. Operational amplifiers admit equivalents.

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Active Band Pass Filter MC33171 (CB15272E)
This circuit can also use other series operational amplifiers such as MC33172, MC33174, MC35171,...
Scanner squelch (CB9424E)
Found in Popular Electronics from the 90s, this circuit mutes a scanner's speaker in the absence of a...
Astable from 4 to 25 kHz (CB9246E)
This circuit was found in General Electric documentation from 1965. The transistors are from that...