Originally created to power an 80's RTTY printer, this circuit can be used in other applications. The circuit is from an Amateur radio of the time.
This device can be used as a proximity arm, touch sensor or electronic bell. When connected to a...
This circuit is from the component's own manual, but it applies to others in the same family. The...
This circuit was found in a 90s Popular Electronics. The circuit uses several relays in order to...