[sdiy] Amphenol edge card connector sides touch?

[Phillip Gallo]

Well, I haven't found any data for this connector.

As to the concept, the many patents filed refer to this technique as
"normaling contacts'', nothing new to the SDIY world.
The concept quickly refines to optimize the uniformity of the contacts
make/break characteristic, as well as self-wiping contact interplay.

Using this technique, a bus-board could be fashioned such that when a PCB
"plugs in",  it can claim bus-signals, route them to its circuit complement,
and then hand them to the next connector (or signal destination).    When
not plugged, the signals have continuity to the next connector.

Benjamin, was this technique employed for the MVCI?
Those funny connectors now look more like interesting vs. non-conforming
connectors.

p
US4US4514030A5US408715114030A


On Wed, Mar 30, 2022 at 6:57 AM Benjamin Tremblay <btremblay at me.com> wrote:

> I had to use connectors like this when I had a PAIA MVCI mainboard and
> multiple cards.
> Ultimately I had to flow solder over the ends of the PCB to keep the
> connections steady enough for digital control lines.
> I missed the Apple ][ era of DIY cards and I don’t think I missed anything
> good.
>
> I would not use them again unless this was a once-in-five-years connection
> and there was some kind of steel bootstrap holding them in place.
>
> On Mar 30, 2022, at 8:26 AM, mark verbos via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> If you look at the third photo photo, you can see what I mean.
>
>
> https://www.qimiadvice.com/amphenol-22522821101-56contact-card-edge-connector-new-great-price-p-178399.htm
>
>
> Mark
>
>
>
> On 22. Mar 2022, at 16:49, Phillip Gallo via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> I have a few Amp 530664-6, Vector R644-3 and generic Chinese copy
> connectors.  There are no shorts between contacts in opposition.
> While Buchla legendarily used a lot of surplus parts to build units at
> times, it could just be these connectors were rejected for use and put in
> store.
>
> <image.png>
> p
>
> On Tue, Mar 22, 2022 at 8:29 AM Valery Klapatsiuk via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>> I checked several Amphenol 225-22821-*101* connectors I have – none of
>> the contacts on them are shorting...
>>
>> Val
>>
>> вт, 22 мар. 2022 г. в 16:02, mark verbos via Synth-diy <
>> synth-diy at synth-diy.org>:
>>
>>> Definitely not. The power is shut down by the shorting.
>>> I have had some success putting my wide tweezers into the slot and
>>> pushing back and forth.
>>>
>>> Mark
>>>
>>>
>>>
>>>
>>> > On 19. Mar 2022, at 19:39, Brian Willoughby <brianw at audiobanshee.com>
>>> wrote:
>>> >
>>> > This matches computer edge card connector circuits I've seen from a
>>> certain era, but now you have me wondering:
>>> >
>>> > Was the Buchla 200 series designed for this shorting of opposed
>>> terminals? I've never owned one...
>>> >
>>> > Brian
>>> >
>>> >
>>> > On Mar 19, 2022, at 09:35, Oren Leavitt wrote:
>>> >> Yes. The terminal pairs normally short on these type connectors when
>>> cards are removed. At least all that I've seen. Power supply lines are
>>> usually connected with same voltage on each terminal pair or one side not
>>> connected.
>>> >>
>>> >> Best bet may be to put a dummy card in unused connectors.
>>> >>
>>> >> - Oren
>>> >>
>>> >> On 3/19/22 8:02 AM, mark verbos wrote:
>>> >>> Hi there,
>>> >>>
>>> >>> I have a Buchla 208 I built from parts from Buchla’s garage sale. I
>>> used the proper (expensive as hell) Amphenol 225-22821-110 edge card
>>> connector for the card slot on the front panel. The pins from the two sides
>>> are touching each other when no card is installed, causing the module to
>>> short power out. Is this normal for these connectors? Is there a way to
>>> stretch it out? Anyone have experience with this?
>>> >>>
>>> >>>
>>> >>> Mark
>>> >
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