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From: "murray horn"
Subject: Re: LCD backlight Dimmer circuit
Date: Tue, 1 Oct 2002 00:32:38 +0200
Organization: The South African Internet Exchange
NNTP-Posting-Date: 30 Sep 2002 22:29:21 GMT
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Cheap and cheerfull
will switch upto an amp @ 40V
cost +- 25cUS
"Brill Pappin" wrote in message
> Lower the amperage instead... maybe a PWM circuit?
> - Brill Pappin
> Rogue Robotics
> "Richard Soennichsen" wrote in message
> > I need to dim an LCD backlight when an external 12V is applied as a
> > I have come up with many circuits that brighten the backlight but cannot
> > find that "elegant" solution for dimming. The backlight can be
> > an LED with a fixed resitor. The circuit has to effectively lower the
> > voltage to the resistor or perhaps bypass the resistor and supply a
> > voltage. Both low and high sides are available. Anyone? Thanks
> > Richard
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