Pre selector with varicap tuning (CB9172E)

This circuit for the medium wave range was suggested by a Popular Electronics from the 90s. The double port MOSFET is an unusual component today.

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Damped filter for triac (CB6742E)
This circuit is from a 1967 General Electric SCR manual. The capacitors are polyester and the...
RC Oscillator (CB9048E)
This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
Modulator without varicap (CB21085E)
This varicap-less modulator circuit was found in an Electronic Design from the 90's. The circuit...