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A comment on Towards a “PCB Drone” – Making a PCB Motor which reaches 30k RPM [video]. Parent comment

Re:Towards a “PCB Drone” – Making a PCB Motor which reaches ... by mindentropy on Monday June 26, 2023 @03:02PM (#36484270)
>Most designs were made by very smart people in the 50s at RCA as far as I can tell.

I am very interested to know this. Do you have any resources on this development work done by RCA and how it has shaped the modern world?

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Re:Towards a “PCB Drone” – Making a PCB Motor which reaches ... by narrator on Monday June 26, 2023 @05:50PM (#36486342)
When I was looking at catalogs of various analog circuit designs, a lot of them were circuits RCA patented that now are public domain because the patents are now expired. They probably aren't the only ones, but they certainly contributed a lot.

https://patents.google.com/?q=(analog+circuit)&assignee=rca&...

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