Contactless temperature sensor (CB7109E)

Found in an American documentation from 1968, this circuit senses the temperature through an infrared sensor of the time. The indicator is analog.

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Phase Shift with a Transistor (CB5439E)
The transistor may be the BC548 in this circuit for low frequency signals. We found it in an old...
Voltage controlled gain amplifier (CB8992E)
Found in a 1980s American documentation, this circuit is intended for amplifying 10.7 MHz video...
Tape Playback Amplifier (CB4761E)
This circuit can be used with older tape player systems to recover media converting for digital...