Ultra high gain FET amplifier (CB9065E)

Found in American documentation this circuit has a typical gain of 500 times. Other transistors can be used.

Magnetic capsule preamplifier (CB7102E)
This circuit was found in a Popular Electronics from the 90s. The circuit uses general purpose...
Analog TV Modulator (CB5357E)
This circuit for analogue TV was found in an American 1980s documentation. The transistor can be any RF...
Rectangular RF and Audio Generator (CB1447E)
We find this circuit in a 1977 technical documentation. The circuit generates signals in a wide...