Cable Locator (CB21303E)

This audio detector circuit can be used for cable identification. We found it in a Popular Electronics from the 90s.

Wein Bridge Oscillator (CB21807E)
This Wein bridge oscillator provides a sinusoidal 3 to 4 kHz signal. The circuit was found in a...
Symmetrical power supply with a regulator (CB24676E)
This interesting symmetrical power supply circuit was found in the January 1981 issue of Radio...
Transistorized Bragraph (CB7009E)
This circuit was found in 80's Popular Electronics. The components used are common and the number of...