Lamp control (CB21962E)

This 60's shield or driver employs germanium transistors. The circuit is from a 1960 Gernsback documentation.

7 MHz receiver (CB9335E)
This direct conversion receiver circuit was found in Radio Electronics from the 90s. The...
Moisture Meter (CB18618E)
This circuit is from American documentation from the 1980s. The circuit can make use of any common...
Shield Darlington NPN (CB25612E)
Using NPN transistors, this circuit activates a voltage relay according to the power supply. The...