>
> > 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 !
>
> I have allmost the same programmer which can program 24xxx but use the
> seriell-port instead. It takes the current from the port. With some changes
> it's a variant of the well known COM84-programmer which can program PIC16x84.
> The software I use is PIP02.

If you want the circuit i try to explain it for you.

/PEK