[sdiy] Amphenol edge card connector sides touch?

[Benjamin Tremblay]

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 <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 <mailto: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 <mailto: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 <mailto: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 <mailto: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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