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.

Band Notch Filter 741 (CB13325E)
We found this configuration of band rejector filter or band rejector with operational 741 in a...
CMOS Oscillator (CB24273E)
This oscillator can use any CMOS inverter. The circuit is crystal controlled and was found in 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...