This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference, as this type of dialing is no longer used today.
This circuit was found in a Hands On Electronics with the suggested application an optical link for...
This circuit is from an Electronics World of 1967. The circuit slows down the activation of a...
This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of...