This touch switch uses components that have easy-to-obtain current equivalents. The power supply must be isolated and the cable to the sensor must be short.
This circuit was obtained in old American documentation and is valid for common JFETs. The circuit...
This traditional metronome circuit is powered by voltages from 9 to 12 V and output drives a...
This ultra-low consumption circuit was originally designed to be powered by a solar panel or small...