The figure shows how to use the LM3914 Bargraph with an external reference voltage source. The reference cannot be greater than the supply voltage.
This circuit was obtained from a 2005 Linear Technology application manual. The circuit is...
Small time intervals up o some minutes can be achieved with this circuit. Only incandescent lamps...
This circuit is from a 1977 Radio Shack documentation. It produces a modulated sound of good...