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.

Integrator (CB14104E)
This circuit can be implemented with other operational amplifiers. The formulas for calculating the...
Antique Mini Transistor Amplifier (CB11872E)
This circuit is from a 1953 publication, consisting of an AM radio with 3 germanium transistors that,...
Thermostat Without Relay (CB18013E)
The sensor of this circuit is a common silicon diode and it directly drives a small cooler with a...