Audio Cable Tester (CB3827E)

This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered by two common batteries.

Emitter Follower Detector (CB12236E)
This circuit is suggested by an English publication from 1980. It is an RF detector that uses a...
Phonographic preamplifier (CB8249E)
This circuit was found in a Electronics World of 1968. The integrated circuit is the MC1320P from...
Power Zener (CB15011E)
The presented circuit simulates a high power zener that depends on the characteristics of the...