Hi Michael,
> -----Original Message-----
> From: Michael Reinelt [mailto:re...@eu...]
> Sent: Thursday, January 26, 2006 10:54 AM
> To: lcd...@li...
> Subject: Re: AW: [Lcd4linux-devel] USB based hd44780 units ...
>
> Hi Luis,
>
> > there is a much more cheaper source for those DC-DC converters, old
> > ethernet cards with the BNC connector, it is a big black
> block, shown
> > vertically with the letters YLC, in this link:
>
> You are right, but (there's always a 'but' :-)
>
> A 5V to negative converter would be better here (as there are
> no 12V when powered by USB).
>
> These convertes from ethernet cards are all quite large (at
> least these that I've seen), while the converter I've been
> using are really small (and may be mounted somewhere on the board)
You are also correct, but let's face it, a display that requires
negative voltages, is usually an old device which would certainly
require a lot more then the 500mA that the USB port supplies,
therefore requiring a separate power source.
Nonetheless, the current DC-DC converters are indeed quite small
while also being effective.
Luis
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