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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Phase detector (CB8155E)
This circuit was found in a 1967 Electronic Design. The FET is from that time. Capacitor C is...
RCA Receiver (CB23624E)
This RCA commercial radio had its circuit published in Radio Electronics magazine in August 1959....
1-Transistor Amplifier Stage (CB961E)
This circuit has a type of bias called "virtual earth" providing good gain, given by R2. The...