[sdiy] Amphenol edge card connector sides touch?

Brian Willoughby brianw at audiobanshee.com
Sat Mar 19 19:39:34 CET 2022

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...


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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