The purpose of this circuit is to measure the intensity of audio signals. We found it in the September 1990 issue of Radio Electronics magazine. The circuit works as a S meter.
A flash of light on one sensor or the touch of your fingers on the other type of sensor will turn...
In the figure below we have a simple way to perform a function test for a solar cell. The circuit is...
This circuit is used in short wave receivers that do not have the BFO (Beat Frequency Oscillator) for...