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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Missing pulse detector (CB7547E)
Using a 555, this configuration appears elsewhere on this site. This is from American...
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Modulated light receiver (CB19581E)
This circuit is from an American documentation from the 70's using transistors of general use of...