Paralell port powered little device.
Edson Brusque email (remove spam text)
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 open
>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 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?
See also: www.piclist.com/techref/ios.htm?key=port
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