Ammeter (CB9660E)

This current meter with many scales was found in a 80s American documentation. The operational amplifier is from that time, uncommon nowadays.

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Bridge photometer (CB12980E)
This photometer is based on a Wheatstone bridge that must be balanced by the linear potentiometer P1. The...
Camcorder Cameras Battery Eliminator (CB16830E)
This 1997 documentation circuit was originally created for use with Camcorder type video cameras....
Audio Cable Tester (CB3827E)
This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered...