Short Wave Converter (T987E)

The conversion range of this circuit depends on the coil. The circuit uses two tubes, and the power supply is not provided.

Field strength meter (CB9740E)
This circuit, with adjusted sensitivity, can use common general-purpose transistors. The circuit is...
5 to 200 seconds timer (CB21401E)
This circuit was found in a 1967 RCA documentation. The semiconductor components are from the...
Astable Multivibrator (MSB016E)
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....