1-Ttube reflex receiver (T1555E)

This one-tube circuit is equivalent to the previous one. We find it in a 1924 book by Gernsback, Power is made by batteries.

Invisible rifle pulse LASER (CB6372E)
Found in an American 1980s documentation, this circuit generates high-intensity pulses for a...
Powerful FM Transmitter (CB17410E)
This powerful FM transmitter was found in a 2002 documentation. The output transistors must be...
Weak Signal Differential Detector (CB6665E)
This circuit was obtained from a 1966 documentation. The transistors are of the time. The circuit...