Medium wave range booster (CB21677E)

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

Test Microamplifier (CB18180E)
This output step with a transistor can be used in experimental radios and intercoms or as a signal...
Solar Oscillator (CB13887E)
This circuit is from an old documentation of Radio Shack from the 70s. The transistor should...
Audiability Control (CB12063E)
We found this configuration in a 1975 publication. It can be implemented easily, as it uses only...