The figure shows how to use the LM3914 bargraph with expanded scale. The circuit has two adjustments determining the extremes of the LED excitation scale.
This power source, obtained in a 1973 publication, suggests the use of partially burned germanium...
This circuit was obtained from an Electronic Design from 1964. Transistors admit modern...
The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be...