Ultra high gain FET amplifier (CB9065E)

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

FM Receiver via Power Grid (CIR25197E)
Unlike the previous one, this circuit is intended for the reception of frequency modulated signals...
Fuel gas detector (CB7807E)
Found in Electronics now from the 90s, this circuit uses a sensor from the time, which is...
18 to 60 MHz Crystal Oscillator (CB13872E)
We obtained this oscillator in a publication for radio amateurs in 1978. The circuit operates on...