This circuit allows you to read capacitances on a common analog instrument. It is part of an article in the April 1990 Radio Electronics magazine.
This circuit is connected to the inputs X and Y of an oscilloscope to display the characteristic curve of a...
-- This old oscillator takes advantage of a transistor radio output transformer of the time. The 2...
This circuit can be used as a buzzer from 3 different locations, allowing you to identify where it went...