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Forum Index : Electronics : Panel Meters Article
| Author | Message | ||||
SparWeb Senior Member  Joined: 17/04/2008 Location: CanadaPosts: 196 |
Hi, I was looking at the panel meters here (http://www.thebackshed.com/windmill/articles/PanelMeter.asp ), and found the article interesting. What I don't get is why aren't you using a LM7809 to power the displays? Why go to 5V just to bring it back up to 9? That inverter sure looks like something I should pull off a few network cards I have lying around, though... Steven T. Fahey |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Steven The inverter is used because the displays need a isolated power supply. The inverter has a input voltage requirement of 5 volts. If we feed it the full battery voltage ( 12, 24, etc ), it will die a very quick and smelly death. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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