What do you call a knob that you can rotate round and round?

I want to implement one of those fancy volume knobs, that has no beginning or end (so not a potentiometer), you know the type you can just rotate on and on, but I don't know what they are called. Does anyone know their name and/or where to get them?

Thx!

Rotary Encoder

Awesome. Thank you!

http://www.goldmine-elec.com/

sell a number. Less than $2. Just search on rotary encoder

I'm sorry, I can't resist - "spinnamajigger".

What do you call a knob that you can rotate round and round?

Well you still call it a knob, but you attach it to a rotary encoder :slight_smile:

In some circumstances you'd call it 'broken' !!