Medium wave range booster (CB21677E)

This circuit is from a 1960 book by Hugo Gernsback. The transistors are germanium from the time.

Capacitance Multiplier (CB14089E)
The configuration already explored in our Circuit Bench section is from the National...
Manual Pulse Generator (CB25031E)
This interesting manual circuit uses an SCR to switch a load on and off via pulses. The circuit was...
2-Transistor Receiver (CB18845E)
The circuit shown was found in a Japan publication from the 1960s. The transistors can be of any...