I'm currently designing a circuit using Alpha RV141F-40-20BL-B50K Potentiometers which feature a clear shift into which a 3mm LED can be inserted.

My initial plan was to just fit a WS2812B underneath each chip for simple RGB addressing of each potentiometer. Unfortunately, there is only a 0.9mm gap underneath the pot, which won't fit the 1.6mm 5050 package. Additionally, I am worried about light leaking from one pot to another if the led is not properly inserted into the shaft.

My second approach was to use an external driver (e.g. TLC5940) and a 3mm RGB led until I realised that "real" 3mm RGB LEDs don't exist.

Does anybody know about an equivalent of a 3mm led as an smd package, any other widely available clear shaft potentiometers or does anybody have any other thoughts/ideas regarding the problem?

Thank you.

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    \$\begingroup\$ Unfortunately sourcing questions are off topic here \$\endgroup\$ – Chris Stratton Dec 28 '19 at 15:53
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    \$\begingroup\$ Another option, route a hole under the potentiometer and mount the led on the back side. I've seen it done with SMD and the led was mounted upside down. \$\endgroup\$ – Ron Beyer Dec 28 '19 at 15:53
  • \$\begingroup\$ Sorry I'm new to EE, but I believe it's less a sourcing and more a design question, isn't it? If anything I'm more looking for a type of package or idea for design than an actual part \$\endgroup\$ – user3567992 Dec 28 '19 at 15:56
  • \$\begingroup\$ @RonBeyer The idea sounds neat, but a 5050 package only has pins at the bottom, so I'd need another package or am I missing something? \$\endgroup\$ – user3567992 Dec 28 '19 at 15:59
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    \$\begingroup\$ Yes, you'd need to select an LED that was compatible with that type of mounting. \$\endgroup\$ – Ron Beyer Dec 28 '19 at 16:39

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