Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

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Fluorescent and Ultraviolet Lamp Inverter (CB1562E)
The inverter circuit shown in the figure can be used to power a fluorescent lamp in an emergency...
Capacitance Meter (CB19855E)
The integrated circuit used in this application is uncommon today. The circuit converts...
Amplitude Modulator (CB19261E)
This circuit was found in documentation on FETs from the 1980s. The circuit receives an audio...