28 Nov
2018
28 Nov
'18
11:34 a.m.
Card Edge Connectors are PC Board to Wire Connectors. The 34-pin version was popular for
control board on 5-1/4? floppy drives in 1980s.
https://en.m.wikipedia.org/wiki/Edge_connector
I have not seen commercial PC board widgets used as an interconnect.
gb
==
Date: Tue, 27 Nov 2018 14:56:18 -0500
From: "William Sudbrink" <wh.sudbrink at verizon.net>
To: cctalk
Subject: 34 pin card edge male to male biscuit (wafer? adapter?)
Hi,
Before I go to the bother of making up a gerber, and putting in a cheap Chinese PCB order,
does anyone know of any place that has them for sale?
28 Nov
28 Nov
12:55 p.m.
New subject: 34 pin Card Edge “Male to Male” Connector
Are the adapters from dual row header to card edge wtill available?
(They were used to connect a 3.5" drive to a 5.25" drive cable)
Could you put two of those back to back connected by a header?
In the late 1970's in the TRS80 world, there were MALE 34 pin card edge
ribbon cable connectors! with gold plated fingers! (used on a short
extension for drives in enclosures, and to convert expansion interface
connections to gold-plated to withstand corrosion and lots of connections)
2:07 p.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On Wed, Nov 28, 2018 at 1:55 PM Fred Cisin via cctalk <cctalk at classiccmp.org>
wrote:
In the late 1970's in the TRS80 world, there were
MALE 34 pin card edge
ribbon cable connectors! with gold plated fingers! (used on a short
extension for drives in enclosures, and to convert expansion interface
connections to gold-plated to withstand corrosion and lots of connections)
Those were great! I'm not entirely sure who made them, but it might have
been Robinson Nugent (since devoured by 3M). It doesn't appear that anyone
makes them any more. The last I saw any was in Anchor Electronics in Santa
Clara CA about 20 years ago.
Sullins does still make male card-edge connectors, but not in an IDC form
for crimping onto ribbon cable. Digi-Key carries them but appears to be
going non-stock.
https://sullinscorp.com/news/news-releases/sullins-double-row-male-edgecard…
https://sullinscorp.com/products/?filters=category:312|col05:11947&togg…
5:01 p.m.
New subject: 34 pin Card Edge “Male to Male” Connector
I'm not sure you're quite getting it... they say a picture is worth a thousand
words:
http://wsudbrink.dyndns.org:8080/images/20181128_194316.jpg
Assuming I make up some gerbers myself, two questions:
1) how do you specify the slightly beveled edge required for easy insertion?
2) is there some way to specify "hardened" or whatever plating for the connector
traces?
And actually a third: Does anyone have a particular PCB company that they like,
communications wise?
Bill S.
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5:13 p.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On Nov 28, 2018, at 8:01 PM, William Sudbrink via
cctalk <cctalk at classiccmp.org> wrote:
I'm not sure you're quite getting it... they say a picture is worth a thousand
words:
http://wsudbrink.dyndns.org:8080/images/20181128_194316.jpg
Assuming I make up some gerbers myself, two questions:
1) how do you specify the slightly beveled edge required for easy insertion?
2) is there some way to specify "hardened" or whatever plating for the
connector traces?
And actually a third: Does anyone have a particular PCB company that they like,
communications wise?
I can't help with the first two -- I would be interested in answers to that myself.
For #1, I suppose a file could be used.
For #3: I have only used a professional PCB fab twice, years apart, but was quite happy
both times. PCB-Pool. Once for a quantity 1 order, once for quantity 10. The fact you
can do quantity 1 is pretty nice, that's where the "pool" in the name comes
from.
With the second order they offered a solder paste stencil at no charge, which I should
have taken them up on but I didn't. TSOP is a pain even with fine tips and fine
solder; I've seen some good articles on how to do reflow soldering in a toaster oven.
Next time, perhaps.
paul
6:05 p.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On 11/28/18 5:13 PM, Paul Koning via cctalk wrote:
> On Nov 28, 2018, at 8:01 PM, William Sudbrink via cctalk <cctalk at
classiccmp.org> wrote:
>
> I'm not sure you're quite getting it... they say a picture is worth a
thousand words:
>
> http://wsudbrink.dyndns.org:8080/images/20181128_194316.jpg
>
> Assuming I make up some gerbers myself, two questions:
>
> 1) how do you specify the slightly beveled edge required for easy insertion?
> 2) is there some way to specify "hardened" or whatever plating for the
connector traces?
>
> And actually a third: Does anyone have a particular PCB company that they like,
communications wise?
My last order from OSHPark came with all traces gold-plated.
Apparently, it's getting to be standard practice.
--Chuck
29 Nov
29 Nov
6:31 a.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On Nov 28, 2018, at 9:05 PM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
On 11/28/18 5:13 PM, Paul Koning via cctalk wrote:
I think mine (from PCB Pool) was similar. Note that that's a very thin gold alloy,
picked for improving solderability. It's not the thick hard gold plating you want for
edge connectors.
If memory serves, PCB Pool offered either "hot air leveled tin" or gold alloy
plating for the traces. The latter is better for small parts because it's flatter,
and the price was either the same or close enough.
paul
> On Nov 28, 2018, at 8:01 PM, William Sudbrink via cctalk <cctalk at
classiccmp.org> wrote:
>
> I'm not sure you're quite getting it... they say a picture is worth a
thousand words:
>
> http://wsudbrink.dyndns.org:8080/images/20181128_194316.jpg
>
> Assuming I make up some gerbers myself, two questions:
>
> 1) how do you specify the slightly beveled edge required for easy insertion?
> 2) is there some way to specify "hardened" or whatever plating for the
connector traces?
>
> And actually a third: Does anyone have a particular PCB company that they like,
communications wise?
My last order from OSHPark came with all traces gold-plated.
Apparently, it's getting to be standard practice.
10:52 a.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On Wed, Nov 28, 2018 at 7:05 PM Chuck Guzis via cctalk <
cctalk at classiccmp.org> wrote:
Sure, but that's just 0.05 to 0.125 microns of ENIG (electroless nickel
immersion gold). That's not intended for mating surfaces, and will wear
away after only a small number of connector cycles.
For reliable edge fingers you need "hard gold" (AKA "hard electrolytic
gold"), which is 0.75 to 2 microns of gold electroplated over 3 to 6
microns of nickel.
(Be careful out there, a lot of places still specify the nickel and gold
thickness in microinches.)
2) is there
some way to specify "hardened" or whatever plating for the
connector
traces?
My last order from OSHPark came with all traces gold-plated.
Apparently, it's getting to be standard practice.
11 a.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On Thu, Nov 29, 2018 at 11:52 AM Eric Smith <spacewar at gmail.com> wrote:
Sure, but that's just 0.05 to 0.125 microns of
ENIG (electroless nickel
immersion gold). That's not intended for mating surfaces, and will wear
away after only a small number of connector cycles.
For reliable edge fingers you need "hard gold" (AKA "hard electrolytic
gold"), which is 0.75 to 2 microns of gold electroplated over 3 to 6
microns of nickel.
I can't find any figures for ENIG, but hard gold is expected to last for
300 to 1000 mating cycles, depending on the plating thickness. Since ENIG
has about 1/15 as much gold, one might expect it to last 20 to 60 mating
cycles at most. Possibly fewer since there's not only a lot less gold (and
less nickel), but also a different application process not engineered to
support surface mating.
5:04 a.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On 11/28/2018 8:01 PM, William Sudbrink via cctalk wrote:
I'm not sure you're quite getting it... they
say a picture is worth a thousand words:
http://wsudbrink.dyndns.org:8080/images/20181128_194316.jpg
Assuming I make up some gerbers myself, two questions:
1) how do you specify the slightly beveled edge required for easy insertion?
2) is there some way to specify "hardened" or whatever plating for the
connector traces?
And actually a third: Does anyone have a particular PCB company that they like,
communications wise?
Bill S.
A board house like PCBCart allows you to specify gold fingers and a
chamfer on the edges if you want.
I've purchased more than 2500 boards from PCBCart and have been happy
with their work including the checking before production of the Gerbers.
Todd
10:53 a.m.
New subject: 34 pin Card Edge “Male to Male” Connector
On Wed, Nov 28, 2018 at 6:01 PM William Sudbrink via cctalk <
cctalk at classiccmp.org> wrote:
1) how do you specify the slightly beveled edge
required for easy
insertion?
2) is there some way to specify "hardened" or whatever plating for the
connector traces?
Those have to be specified "out of band", i.e., in production documentation
that you deliver along with the gerber and excellon files.
1981
days inactive
1982
days old
10 comments
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cclist＠sydex.com -
cisin＠xenosoft.com -
paulkoning＠comcast.net -
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tsg＠bonedaddy.net -
w9gb＠icloud.com -
wh.sudbrink＠verizon.net