Found in the CQ radio amateur magazine, this circuit generates a standard 100 kHz signal. The circuit is from 1965 and can be made with modern equivalent transistors.
This sensitive passage alarm was found in the August 1971 Radio Electronics magazine. The light...
This filter has the components calculated for the frequency of 1 kHz but can be changed. The input...
The direction of rotation of the M motor can be controlled by an Arduino or another...