9V power supply

Peter D. Hipson mail at darkstar.mv.com
Fri Aug 13 17:20:31 GMT 1999

Be careful, many LCD meters cannot have a common ground with the voltage
being measured. You probably will have to either buy or make an isolator
(they are nto that expensive). Otherwise just use a 7809 regulator, with a
small by-pass cap on the output. The resistor and diode trick requires a 9V
zener diode and a dropping resistor, and is rather inefficient to boot!

At 05:00 8/13/99 -0400, you wrote:

>Date: Thu, 12 Aug 1999 21:50:04 -0500
>From: Tom Sharpe <twsharpe at mtco.com>
>Subject: 9V power supply
>I need 2 mv @ 9V to drive an LCD in dash.  My radioshak book says I can do
>it with a resistor and diode. Can any EEs out there give me values or part
>numbers???  TIA Tom

        Peter Hipson (founder, NEHOG)
        1995 White NA Hummer Wagon

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