piclist 2000\06\05\211456a >
Thread: Paralell port powered little device.
face BY : Dale Botkin email (remove spam text)

On Mon, 5 Jun 2000, Edson Brusque wrote:

>     Take power from the keyboard connector seens to be the option. I could
> make an adapter using a pair of din connectors and take the signals from pin
> 4 (GND) and pin 5 (+5VDC/VCC) to power my little gadget. What about using a
> pair of resistors (say, 47R)in series with the GND and VCC to limit the
> current in case of short-circuit?

You definitely do want to limit the current.  Most system boards have a
picofuse on the keyboard Vcc line.  If you draw too much, you blow the
fuse -- which results in what appears to the consumer as a dead
motherboard.  Not a nice thing for anyone concerned.  Yeah, a techie can
find & replace the fuse, but not Joe Average.

The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov


In reply to: <006201bfcf42$c0373d20$c4a3f7c8@bigbru>
See also: www.piclist.com/techref/ios.htm?key=port
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