[sdiy] Amphenol edge card connector sides touch?

[Phillip Gallo]

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: 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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