14 Sep
2014
14 Sep
'14
5:38 p.m.
Back home now, the trip up north was great.. it got a bit cold,
particularly out on the lake, but great never the less!
The generally-available 8800 kit manual is for the original (perhaps 'A')
version, which contains grounding scheme notes for the 'A' type power
supply. My machine has a 'B' type PSU, and as such, may have some
differences.
Is anyone aware of any differences between the A and B type grounding
schemes? Can anyone provide any documentation for the same?
Also - I was able to come up with some 1/8" braid to create the several
ground straps - but I can't find any 1/4" braid as spec'd in the manual.
But again, the manual is for the 'A' series and the 1/4" braid is used on
the negative end of the many (8?) electrolytics used on the A type PSU
board.
I'm not even sure if such a scheme is used on the B type board.. and my
board bears no sign that such a scheme were ever implemented. But
obviously, the board +must+ be very solidly grounded, so.. how was it done
in the day?
As ever, thanks for all of your input! The project is coming together
nicely..
14 Sep
14 Sep
5:43 p.m.
Lost my chain of thought for a moment.. re: the 1/4" ground braid.
Does anyone have some of this material? I'd only need 12" or so. Plain
tinned copper ground braid, 1/4" wide (that's roughly 6.5mm x 30cm for the
imperially-challenged among us. ;-)
On Sun, Sep 14, 2014 at 8:38 PM, drlegendre . <drlegendre at gmail.com> wrote:
Back home now, the trip up north was great.. it got a
bit cold,
particularly out on the lake, but great never the less!
The generally-available 8800 kit manual is for the original (perhaps 'A')
version, which contains grounding scheme notes for the 'A' type power
supply. My machine has a 'B' type PSU, and as such, may have some
differences.
Is anyone aware of any differences between the A and B type grounding
schemes? Can anyone provide any documentation for the same?
Also - I was able to come up with some 1/8" braid to create the several
ground straps - but I can't find any 1/4" braid as spec'd in the manual.
But again, the manual is for the 'A' series and the 1/4" braid is used on
the negative end of the many (8?) electrolytics used on the A type PSU
board.
I'm not even sure if such a scheme is used on the B type board.. and my
board bears no sign that such a scheme were ever implemented. But
obviously, the board +must+ be very solidly grounded, so.. how was it done
in the day?
As ever, thanks for all of your input! The project is coming together
nicely..
8:27 p.m.
From: drlegendre: Sunday, September 14, 2014 6:43 PM
Lost my chain of thought for a moment.. re: the
1/4" ground braid.
Does anyone have some of this material? I'd only need 12" or so. Plain
tinned copper ground braid, 1/4" wide (that's roughly 6.5mm x 30cm for the
imperially-challenged among us. ;-)
JameCo part number 1392-50?
Vince
15 Sep
15 Sep
12:18 p.m.
Hi Vince,
On Sun, Sep 14, 2014 at 11:27 PM, Vincent Slyngstad <vrs at msn.com> wrote:
JameCo part number 1392-50?
Vince
If the question is "Is this the right material?" - then that's a
'yes'..
But if you're asking "Will you buy 50ft. for $30 + ship when you need less
than 1ft. of it?" - that would be a big 'no'. ;-)
16 Sep
16 Sep
5:16 p.m.
On 09/14/2014 06:43 PM, drlegendre . wrote:
Lost my chain of thought for a moment.. re: the
1/4" ground braid.
Does anyone have some of this material? I'd only need 12" or so. Plain
tinned copper ground braid, 1/4" wide (that's roughly 6.5mm x 30cm for the
imperially-challenged among us. ;-)
Not on hand, but I used to take (naked) audio cable with a braided
shield and simply pull the inner conductor. Worked just fine--but that
was long ago.
OTOH, there's plenty tinned braid on eBay for not much.
--Chuck
.
7:05 p.m.
Howdy Chuck,
On Tue, Sep 16, 2014 at 8:16 PM, Chuck Guzis <cclist at sydex.com> wrote:
That's what I did to cover the 1/8" requirement.. found a couple feet of
Belden (audio, RF?) co-ax from the 1960s. It had a braided shield which I
stripped-out and used as raw material to make a few ground straps.
But I didn't see any 1/4" material on eBay - at least not in short lengths,
for fair money. All I need is a foot, at max.. and I'm wiling to pay $2 for
it.
Not on hand, but I used to take (naked) audio
cable with a braided shield
and simply pull the inner conductor. Worked just
fine--but that was long
ago.
OTOH, there's plenty tinned braid on eBay for not much.
7:21 p.m.
On 9/16/2014 8:05 PM, drlegendre . wrote:
Howdy Chuck,
On Tue, Sep 16, 2014 at 8:16 PM, Chuck Guzis<cclist at sydex.com> wrote:
That's what I did to cover the 1/8" requirement.. found a couple
feet of
Belden (audio, RF?) co-ax from the 1960s. It had a braided shield which I
stripped-out and used as raw material to make a few ground straps.
But I didn't see any 1/4" material on eBay - at least not in short lengths,
for fair money. All I need is a foot, at max.. and I'm wiling to pay $2 for
it.
I may have some at home (get back Fri night) but.... are you reasonably
close to Silicon Valley.....?
Steve
Not on hand, but I used to take (naked) audio
cable with a braided shield
and simply pull the inner conductor. Worked just fine--but that was long
ago.
OTOH, there's plenty tinned braid on eBay for not much.
17 Sep
17 Sep
5:05 p.m.
I'll look Sat and see what I have in the junk box. May be able to help.
Steve
On 9/16/2014 10:00 PM, drlegendre . wrote:
Hey Steve,
On Tue, Sep 16, 2014 at 10:21 PM, steve shumaker<shumaker at att.net> wrote:
I may have some at home (get back
Fri night) but.... are you reasonably
close to Silicon Valley.....?
Steve
Closer than, say, the far side of the moon.. ;-)
(I'm in MN)
20 Sep
20 Sep
2:51 p.m.
On 9/17/2014 6:05 PM, steve shumaker wrote:
I'll look Sat and see what I have in the junk box.
May be able to help.
Steve
On 9/16/2014 10:00 PM, drlegendre . wrote:
OK. Checked several places and do not have anything that will
help... (found one short piece of the 1/8" stuff but nothing larger)
sorry!
and didn't make it to San Jose today so that so couldn't help there either
Steve
Steve
Hey Steve,
On Tue, Sep 16, 2014 at 10:21 PM, steve shumaker<shumaker at att.net>
wrote:
I may have some at home (get back Fri night) but.... are you reasonably
close to Silicon Valley.....?
Steve
Closer than, say, the far side of the moon.. ;-)
(I'm in MN)
4:54 p.m.
No worries Steve, thanks for looking. Actually, I think I'm covered at this
point.. I don't see anyplace to install it on the bottom of the 'B' board,
so I'll just assume that it was deleted as part of the B spec.
Stripped the chassis bare the other night, so I could clean it up well,
tighten / replace any bad fasteners, and _properly_ mount the 3" 95,000uF /
20V computer-grade cap. I want it to be right from the ground-up, and
there's no better time than the present to do that..
The previous owner must have lost the 3" cap clamp, as the cap was glued
in-place with what seems to be construction adhesive - like Liquid Nails,
and so on. Took some heat to get that one apart! But now it's all good, and
in the process of final assembly. I think I +might+ replace the main (8V)
bridge rect. with a more modern 35A / 100V part.. just because I can, and I
have them.
On Sat, Sep 20, 2014 at 5:51 PM, steve shumaker <shumaker at att.net> wrote:
On 9/17/2014 6:05 PM, steve shumaker wrote:
I'll look Sat and see what I have in the junk
box. May be able to help.
Steve
On 9/16/2014 10:00 PM, drlegendre . wrote:
OK. Checked several places and do not have anything that will help...
(found one short piece of the 1/8" stuff but nothing larger) sorry!
and didn't make it to San Jose today so that so couldn't help there either
Steve
Steve
Hey Steve,
On Tue, Sep 16, 2014 at 10:21 PM, steve shumaker<shumaker at att.net>
wrote:
I may have some at home (get back Fri night) but.... are you reasonably
close to Silicon Valley.....?
Steve
Closer than, say, the far side of the moon.. ;-)
(I'm in MN)
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