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Forum Index : Electronics : Panel Meters Article

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SparWeb

Senior Member

Joined: 17/04/2008
Location: Canada
Posts: 196
Posted: 06:46pm 08 May 2008
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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
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5108
Posted: 08:58pm 08 May 2008
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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.

GlennEdited by Gizmo 2008-05-10
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