This shield circuit was suggested by a 90s Popular Electronics. The circuit can use either a triac for a common load or a mechanical relay.
This small locator transmitter was found in old Radio Shack documentation. The transistor could be a...
This circuit causes the light of a bicolor LED to change when it is turned on. The time of...
This circuit was found in a 1968s European documentation. It is a current regulator using...