Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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Radio NEC NT 7P (CB18424E)
This medium wave radio with 7 germanium transistors was manufactured in Japan in the 1960s. Its...
Blocking Oscillator (CB19576E)
In this circuit the frequency is determined by the coil and the variable capacitor. Transistors like the...
Thermocouple amplifier (CB19717E)
This high stability circuit is from the datasheet of the component used which is not very common...