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KBK update for Sunday, 7th February

Having just uploaded the specifications of Oak Full Travel Membrane (kindly scanned in by TG3 Electronics), this seems a perfect time to upload an article from around the same time that describes the workings of Micro Switch’s own offering: SC Series capacitive membrane keyboards. It is not clear which of Oak and Micro Switch introduced membrane keyboards first, but both types seem to date from the start of the move to full travel membrane keyboards. (Datanetics batch-fabricated array is much older, but they found that discrete switches were more practical.)

When I first encountered suggestions of capacitive membrane keyboards from Alphameric, it seemed like some kind of a mistake, but the article from Computer Design from 1981 depicts and describes the operation.

View within the updates for 2021

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