Paralell port powered little device.
Bob Ammerman email (remove spam text)
----- Original Message -----
From: Mark Willis <FOXINTERNET.NET> mwillis
To: <MITVMA.MIT.EDU> PICLIST
Sent: Monday, June 05, 2000 8:28 PM
Subject: Re: [EE]: Paralell port powered little device.
> Edson Brusque wrote:
> > Hello all,
> > Arthur Brown wrote:
> > >Why not take the power from the keyboard conecter or a games port
> > >40Ma from the printerPort is not easy to do, as some motherboards use
> > >collecter outputs if you reduce your Ma request you could take a small
> > >voltage from unused datapins at the lower ttl high voltage.
> > Take power from the keyboard connector seens to be the option. I
> > make an adapter using a pair of din connectors and take the signals from
> > 4 (GND) and pin 5 (+5VDC/VCC) to power my little gadget. What about
Of course, at 0.5A, your 10R resistor will end up dissipating 2.5W, which is
quite enough to turn a 1/4W (and probably even a 1/2W) resistor into a fuse!
You might be better off with an actual low-current fuse or polyswitch
(high performance, high function, low-level software)
[And occasionally a little (digital) hardware :-) ]
See also: www.piclist.com/techref/ios.htm?key=port
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