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I am designing a mechanical attitude indicator for the avionics simulator. I need a pancake slip ring, that drives servo (max 500mA at 5V) and some backlight. My idea is to use a gold-plated PCB and brushes mounted on the other PCB. But I am struggling heavily, to find suitable brushes, that can be PCB-mounted. The only thing I found is EMI gold finger contacts and pogo-pins, but they are too stiff for this application, what I am looking for is similar to the wiper of the potentiometer. Any help?

FeroFixxer
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  • Why can't you use a pancake slip ring? – Andy aka Feb 16 '21 at 11:17
  • You'll find potentiometer style wipers ... in a potentiometer. For prototyping, pull one apart and keep moving. You can also buy beryllium copper spring wire or strip by the metre. –  Feb 16 '21 at 14:51

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To build:-

slip ring

From https://www.moflon.com/mpcb.html

So I suggest either buy some carbon brushes and mount them yourself in a DIY holder thingie, or buy a full a cheepo slip ring like the Adafruit one.

Notice that the slip ring picture above uses four sets of brushes to maintain electrical connectivity and mitigate contact bounce.

Paul Uszak
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  • I am planing to utilize slip-ring PCB for other electronics like connectors, drivers, etc. Adafruit one is not a pancake, so I cant drive shaft trough, low profile is also reqirement. I can google, and I did sufficient research before asking. Thank you for pointing out, that I should use multiple of something, I cant get at the first place. – FeroFixxer Feb 16 '21 at 16:08