Ok Mike, if this is for a single instalation, your computer and all, why
not just install a "Y" power connector at your PC I/O power supply cable
and then you can install a small terminal block outside with not only
+5Vdc (bunches of current available) but also +12V...?    All cpu fans
have those Y cables, so just look at the junk box.

There is a tendency to be afraid to mess with computer power supply, but
we are willing always to mess with the little and fragil voltage
generated by the parallel and serial driver chips... why is that?

PC's power supply are strong and some can stand a nice external short
circuit via 5ft #24 wire at +5Vdc without shutting down...  The worse
can happens is rebooting the PC, but if you fry a parallel port chip,
you be better buy another mother board or parallel port card.

Still afraid? ok, install a 1A fuse in the wire!

Wagner.

Mike M wrote:
>
> hey guys i built a programmer to program 24lc32 eeproms, i wanted to know if t
he 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.
>
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