This circuit was found in Linear Technology documentation from the 90's. The circuit uses components from that time, and can be powered by 5 V. In these conditions, it can function as a shield.
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...