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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Light Activated Switch (CB14457E)
This circuit is from 1968 documentation. We can assemble it with more modern components such as a...
FET Regenerative receiver for all ranges (CB13311E)
The frequency ranges that this receiver can tune in depend only on the coils. For medium waves L1...
5V x 500 mA Buck Converter (CB9952E)
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...