21 Aug
2001
21 Aug
'01
4:22 p.m.
On Tue, 21 Aug 2001, Richard Erlacher wrote:
see below, plz.
Dick
----- Original Message -----
From: "Roger Merchberger" <zmerch(a)30below.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, August 21, 2001 2:38 PM
Subject: Wiring Classic Machines to Triacs (was: Assembly vs....
**** www.gatewayelex.com ****
Rumor has it that Tony Duell may have mentioned
these words:
<snip>
3 questions:
Does anyone have some good schematics or facts/figures (no matter how
basic) as to a good way to interface triacs to a classic computer? (I'm
mainly worried about 2 things: circuit isolation & heat dissipation of the
triac) ...
Take a look at the Motorola Optoelectronics Databook. That has optoisolated
triac drivers, SCR drivers, etc. in addition to the usual optoisolators. Also,
take a look at Burr-Brown's isolation hardware. They've got a couple of pretty
good devices I once used to provide isolation between the stage (@2KV reference
with respect to earth) and the interface logic (@earth-ground reference) on a
scanning electron microscope for auto-registrathion/alignment of wafers in an IC
fab. They're capable of over 2 KV of isolation and 80MHz of bandwidth.
Does anyone have some good schematics / advice on how to interface a 12 or
16-bit A/D chip to an 8-bit system?
there are converters in both directions that operate serially, not to mention a
few that work byte+nybble. Check with www.maxim-ic.com and www.analog.com
And lastly: Does anyone have any references to where I could purchase
40-pin board edge connectors (instead of the usual 44-pin) other than
hacking said connectors with a dremel tool?
more info is needed here. What pin pitch are you after? If you want the most
common 44-pin connector's pitch (0.157") there may be trouble, but Gateway
Electronics in Denver, (they don't even have a web site!) (303) 458-5444 had a
few dual 20's on 0.100" pitch when I last looked. Web
references, book references, personal experience, *any* info is welcome!
There are
LOTS of sites that handle "controlling the world" interface issues,
and may show up on GOOGLE searches using simply the most obvious search terms.
Try "stepping motor" or Fourier Series, just for grins ...
Thanks loads (and trying to keep the S/N ratio higher...)
Roger "Merch" Merchberger
--
Roger "Merch" Merchberger --- sysadmin, Iceberg Computers
Recycling is good, right??? Ok, so I'll recycle an old .sig.
If at first you don't succeed, nuclear warhead
disarmament should *not* be your first career choice.