[sdiy] Looking for a mini rotary encoder with very low torque (servo type)

[cheater cheater]

Print a disc with the usual binary pattern and encode it with a CCD
cell or a few optocouplers. You can print it on a transparency to make
it shine-through.

On Wed, Dec 11, 2024 at 4:14 PM Jean-Pierre Desrochers via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> I'm looking for a very small (20mm or less body diameter)
> rotary encoder with very low torque (servo type).
> The low torque shaft is needed because it will turn by means
> of a small wheel with rubber sides that will be put against a moving surface, turn and 'follow'
> the moving surface.. no slipping allowed !
>
> The precision of steps/turn is not important.
> But the higher will be best..
>
> I was thinking of using a dismantled PC mouse (rubber ball type)
> and use one of the two  X/Y optical rotary encoders, but these PC mice
> nowadays are hard to find.. So.
>
> I checked Digikey and Mouser but they have encoder too big
> for my uses..
> The smaller I found has 20mm in diameter..
> https://www.digikey.ca/en/products/detail/nidec-components-corporation/RES20D-50-201-1/6469509
>
> Any suggestions ?
>
>
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