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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Active Tone Control LM387 (CB13928E)
The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is...
Wien Bridge Oscillator 1.5 to 15 kHz (CB12428E)
Found in a 1995 Hands-On Electronics, this circuit generates a sinusoidal signal whose frequency...
to DC converter (AC)
This precision circuit was found in ancient American documentation. The most critical component is the...