29 Jul
2004
29 Jul
'04
4:21 a.m.
From: "ben franchuk"
<bfranchuk(a)jetnet.ab.ca>
Ethan Dicks wrote:
What about a big electric arc?
Just don't weld it to the bench. :)
Hi Ethan
Ben's idea is great. You just need an arc. There must be an
arc welder around the place for maintenance. Even an arc
Just pop
down the block to your friendly neighbourhood tanning salon....
The closest one
would probably be Christchurch, NZ... I'll be there in
mid-November. -ethan
from a low voltage, high current power supply would
work well.
The best electrodes would of course be carbon but even an
iron welding rod arc produces abundent UV across the entire
spectrum. Make sure to have something to block the UV from
you. Eye and skin damage can happen with even a small arc.
What kinds of parts do you have access to? A number of
7414's, 7400's and 74374's ( or similar families ) would
handle the logic part of connecting to a PC's parallel port.
All you'd need is a couple transistors to switch the
VPP on and a diode or two to supply bypass. As I recall,
these PROMs only need logic level switching for the actual
programming.
You don't need any counters the printer port can be divided
up to supply all the needed expansion ports using the 374's.
Of course, If you had several parallel ports from a number
of I/O boards, collected from several PC's, you could avoid
a lot of circuitry. Just run the wires to the chip.
Stretch your imagination, I'm sure you'll find that there
are many ways to skin a cat.
Dwight
Dwight