This circuit was found in the January 1995 Electronics Now magazine. The source must be dual, and a noise pickup guard ring must be used.
The figure shows how to use the LM3914 bargraph with expanded scale. The circuit has two...
This circuit was originally intended to operate with a solar source for experiments. Transistors are...
This circuit can be used as an input shield for microcontrollers or other TTL circuits. The power...