This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This circuit includes an AD converter for interfacing with a microprocessor and can be used as a...
This watch was found in 2001 documentation. The watch is powered by 4 batteries. To save energy, the...
Found in ancient American documentation, this circuit uses an operational amplifier of the time,...