The Dual LM3914_CalcV3.0. exe file requires the Visual Basic 5 or 6 runtime files. [free download from the web].
Having the two LM3914's, its possible to configure them in series to give a 20 LED display.
Be sure to follow the datasheet showing the actual interconnections required between the two LM3914's.
It is possible to select the basic configurations for the two LM3914's.
Note: The Visual Basic runtime files are often required for many web sourced programs.
It is recommended that you download the Datasheet for the device from www.datasheetarchive.com
Ensure that your designs are within the stated operating parameters of the device.
June 2011: added the Single LM3914 Calculator
Apr12: added an example for a 12V vehicle battery status indicator.
Single and Dual LM3914 V3.0 Calculator
Blog entry posted in 'General Purpose Circuits.', May 15, 2010.