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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Heterodyne Frequency Meter (CB22320E)
This circuit determines the frequency of a signal by beating with a known signal. The circuit was...
Variable Timer 555 (CB15097E)
With the values of the components indicated, this timer controls intervals from a few seconds to a...
Water Pump Automatic Control (CB18101E)
The purpose of this circuit is to automatically turn a water pump on and off. Sensor 1 is the...