> Van: Mike M <elektrikman@DYNAMITEMAIL.COM>
> Aan: PICLIST@MITVMA.MIT.EDU
> Onderwerp: Parallel port current
> Datum: vrijdag 12 november 1999 4:50

Hi Mike,

> hey guys i built a programmer to program 24lc32 eeproms, i wanted to know
if
> the parallel port would have enough current to supply power to operate
the chip.
> i believe the 24lc32 needs a Vcc of 3ma at around 5v while its writing.
If not i
> guess ill have to throw on a 9v battery and a 7805.

I've got a 24C16 "programmer" here, that takes it's current from the
Printer-port.  I just wired 3 output-pins together thru BAT 85 diodes (0.3
volts voltage-drop).  Other parts are two  BAT 85 diodes to create two
Open-collector outputs (for SDA & SCL) , and two 10 K-ohm resistors as
pull-ups.  The whole "circuit" is build into a connector, just leaving 4
threads going to my "adapter" ( a simple IC-socket ).  It has not failed me
yet !

Regards,
  Rudy Wieser