The figure shows how to obtain a digitally programmed resistance using the 4066. The circuit is from a Radio Electronics from November 1989.
This very simple circuit must use coal microphones of the type found in very old equipment. The...
This biestable circuit was found in a Popular Electronics from the 90s. The circuit has an unusual...
This circuit was found in a 1969 US documentation. It provides a signal that can be externally...