This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
This circuit was obtained from a 1997 publication. It is an alarm that has a lock and a bistable...
This circuit is from a project published in the March 1996 Electronics Now magazine. The author used...
This well-known circuit is another version of a 2-transistor transmitter found on the Internet. In this...