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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Synchronized Oscillator with Reset (CB19959E)
This circuit, from a documentation of the 90s, uses unusual operations today, but the...
Counter Up to 25 using the 4017 (CB10889E)
This circuit is from a Radio Electronics from May 1994. In it we have the way to connect three 4017...
Dynamic Noise Limiter (CB15838E)
This circuit is from the 70's by A. Fanzeres. We kept the original text. It has already been said...