Voice activated intercom (CB7828E)

This one-channel circuit was found in a 90s Popular Electronics, functioning as a vox. Components are common today.

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Alternator Voltage Regulator (CB1417E )
We find this circuit in an earlier American publication of 1978. The components are no longer...
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Found in Radio Electronics from the 90's, this circuit employs a 3140 operational amplifier, still...
PWM controller with high-side Drivers (CB12518E)
The circuit shown in figure 1 is a suggested application for ISL8107, a new integrated circuit from...