This circuit is intended for detecting 3 levels power grid voltage, and it can be adapted to operate with the most diverse voltages. The circuit uses neon indicator lamps.
This circuit was found in an English publication from 1967. The circuit is for listening on a...
This circuit allows you to use a digital multimeter as a thermometer. The sensor is mounted in a...
This configuration, which appears in other articles on this website, was found in a European...