I've almost pulled the trigger today on a headphone kit from Stern but got to thinking, Has anyone done a DIY version of this?

We'd need a:

1) Potentiometer
2) 1/8" input jack for the door
3) ***adapter for the spike board to connect to the input, what part is this?

I could use any info on #3 if you have it...

Thanks in advance Pinside Guru's

Hmm, rotary encoder. And I thought I was so smart. Looks like I'm headed back to the google machine to learn what that is.

P.s.
I just accidentally put an order in for a spike 2 kit, a monitor bezel, and mirror for my Star Wars.

This thread may never get off the ground

Thanks guys

Rotary encoder
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A Gray code absolute rotary encoder with 13 tracks. At the top, the housing, interrupter disk, and light source can be seen; at the bottom the sensing element and support components.
A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to analog or digital output signals.

There are two main types of rotary encoder: absolute and incremental. The output of an absolute encoder indicates the current shaft position, making it an angle transducer. The output of an incremental encoder provides information about the motion of the shaft, which typically is processed elsewhere into information such as position, speed and distance.

Rotary encoders are used in a wide range of applications that require monitoring or control, or both, of mechanical systems, including industrial controls, robotics, photographic lenses,[1] computer input devices such as optomechanical mice and trackballs, controlled stress rheometers, and rotating radar platforms.