Selective Light Amplifier (CB25488E)

This IR light sensor circuit was found in the July 1992 issue of Radio Electronics magazine. It is tuned for 20 kHz modulated light.

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Low-power oscillator HA7210 (CB25582E)
This oscillator, which operates from 2 V, was found in the June 1993 issue of Radio Electronics magazine....
AGC for Receivers (CB4214S)
This circuit is intended for communications receivers. We can find it in a documentation from the...
Simple One Transistor Audio Stage (CB942E)
This circuit was found in publication of the year 1958. The circuit uses one of the first...