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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Contactless temperature sensor (CB7109E)
Found in an American documentation from 1968, this circuit senses the temperature through an...
Voltage Level Detector (CB4660E)
This circuit is intended to trigger an alarm when the input voltage exceeds one value and to...
6 W Amplifier (CB4934E)
This 80's amplifier delivers 6 W of 8 ohm speaker power without using an output transformer....