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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One Pulse Per Second Generator (CB20136E)
This circuit was found in documentation from the 80s. It is based on unijunction transistors not...
DC PWM Motor Photocontrol (CB11855E)
The speed of the motor connected to this circuit depends on the amount of light that strikes the...
Optical isolator (CB8272E)
This sensor circuit from a 1967 Ferranti documentation uses components from the era. The circuit...