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.

Different Crystal Radio (CB933E)
This different configuration for a crystal galena radio or modernized since a diode is used, has a...
Flashing Timer Switch (CB16959E)
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
SCR Test your Nerves (CB12205E)
This version of the test lights a lamp when the ring touches the tortuous wire. The SCR can be the...