LED Flasher Unijunction (CB22144E)

The frequency of this circuit depends on the capacitor. The unijunction transistor can be the 2N2646.

Atmospheric noise monitor (CB21066E)
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...
FM transmitter (CB16327E)
This project was found in a 1982 publication. It is a small transmitter that can send signals from...
Medium wave range booster (CB21677E)
This circuit is from a 1960 book by Hugo Gernsback. The transistors are germanium from the time....