Wien Bridge Oscillator (CB8093E)

This circuit was found in a Popular Electronics from the 90s. Transistors admit equivalents, as well as the operational.

Walk Talkie for 1 km (CB3826E)
This circuit using components that are still common in our market was found in a 1987...
Varicap Beat Oscillator (CB25649E)
The varactor or varicap diode tunes the signal for listening to SSB signals on a common receiver. The...
Lamp Control (CB21676E)
This circuit that also serves to control LEDs and other loads is from a 1960 publication. The...