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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Hybrid Amplifier - 10 or 20W (CB999E)
This amplifier uses hybrid modules Sanken and can provide powers of 10 W or 20, depending on the...
RMS to DC Converter (CB6105E)
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...
Optical Shield TTL - II (CB1324E)
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...