On a Roland TR09 (rear view) (Roland's 2016 recreation of their famous TR909):

enter image description here

we can see a stereo volume potentiometer, that is smaller than usual.

Question: Is this

  1. a normal potentiometer + a "striated" black cap (if so, what is the proper name? I guess striated cap is not the right name, I haven't found anything with this name)


  1. some small potentiometer with black rubber-looking shaft, all-in-one?

Note: it's not a sourcing question, but I'd like to know what kind of component it is, and the proper name of it (this will allow me to search then).

  • 2
    \$\begingroup\$ Sometimes they are called "knurled" although typically knurled knobs are a hatch pattern. On Mouser they are referred to as "Knurled - Straight". You would usually source the knob separate from the potentiometer itself, it slides onto the shaft. \$\endgroup\$ – Ron Beyer Nov 28 '17 at 0:19

Pot. Knobs come in 3 types "Flat" or D shape, Slotted and Knurled 20 or 40 teeth as well as various shaft length , 15 to 35mm in 5mm increments with linear and log. (audio) profiles and shaft diameters such as 6mm.

This would be a right angle PCB mount, log. , knurled 6mm 40 tooth, Pot.

  • \$\begingroup\$ Thanks! Do you think I should look for 2. (pot+knob all in one), or 1. (I should shop pot and knob separately)? \$\endgroup\$ – Basj Nov 28 '17 at 0:33
  • \$\begingroup\$ Something else: when pot manufacturers say "16mm pot" or "9mm pot", does 16 and 9 refer to shaft, width, height, diameter, something else, etc. ? \$\endgroup\$ – Basj Nov 28 '17 at 0:34
  • \$\begingroup\$ approx. diameter \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 28 '17 at 0:38
  • \$\begingroup\$ For example this one seems to be a 16mm. The shaft cylinder has not a 16mm diameter, right? \$\endgroup\$ – Basj Nov 28 '17 at 0:43
  • \$\begingroup\$ Body diameter, not shaft \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 28 '17 at 0:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.