Combined Light and Dark Alarm 741 (CB25480E)

This circuit detects a light window using two operating systems. The circuit is from a July 1992 Radio Electronics.

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1kHz Double T Oscillator (CB10957E)
This circuit came out in a Popular Electronics from December 1995. It is a double T configuration that...
Transistor Simple Amplifier (CB18553E)
This low power amplifier, with 2 W in charge of 16 ohms, was found in a Japanese magazine from the...
Gain Control with Limiter (CB6322E)
This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital...