Using the LM3914 this unusual digital clock uses a Bargraph LED indicator. The LEDs are the segments of a 7-segment display. We found it in February 1980 Radio Electronics magazine.
This simple voltmeter takes advantage of a 150 uA instrument. The circuit is from a Radio...
This circuit was found in an English magazine from 1977. The critical component is the gas sensor....
This commercial receiver manufactured by Sanyo in the 1960s used a loop antenna. The circuit is...