This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
This circuit is from a 1970 General Electric documentation. It can be found with variations on this...
This circuit was found in a General Electric documentation from 1970. It is used in an optical...
This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and...