Found in a 1969 Burr-Brown publication, this circuit makes use of integrated components from that period. With modern equivalents, it can be adapted to be used as a shield.
This circuit is from 1988 documentation. It uses a range of 30 LEDs driven by 4017 integrated...
This circuit was found in Electronics Now, it can be used with universal phones on a common...
Delivering Over 4X More Battery Life and Faster Time to Market, Platform Comes Complete with...