Radiation thermometer (CB7242E)

Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The sensor is of the type that is difficult to obtain today.

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Infrared Receiver (CB19629E)
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Modified Hartley Oscillator (CB21138E)
This circuit was found in old American documentation. Transistor is general purpose and coil rated...
Touch switch (CB21352E)
Found in English documentation, this touch sensitive switch must be powered by an isolation...