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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Automatic Protection Power Source (CB15847E)
This circuit supplies voltages from 6 to 18 V with a maximum current of 2 A. We found it in a...
RMS to DC Converter (CB6105E)
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...
Current Regulator 1.5 A L200 (CB15145E)
This circuit was found in the SGS manual of linear integrated circuits of 1982. The integrated circuit...