3-way control (CB7047E)

This is a simple circuit to control a set of lamps from 3 different points. We found it in an old Popular Electronics.

Simple Alarm (CB16496E)
This circuit triggers an oscillator when any of the sensors is opened. The circuit can be powered by...
Electronic Bird (CB18670E)
This circuit imitates the singing of a bird intermittently with the intermittency determined by C1...
Super simple amplifier (CB23699E)
This is a high gain circuit with 3 transistors connected in direct coupling. The circuit is from a...