From Livid Wiki

The Turn board is designed to have a single rotary potentiometer and a backlight LED circuit. The LED is designed for ambient backlighting and a separate 12v power supply, however, there is no reason you couldn't use a talkback LED as provided by the Brain, similar to the LED on the Push boards. Each board is 1"x1" and comes in a 4x4 board grid that can house 16 9mm rotary potentiometers separated by v-score lines. The boards can break apart into single boards, so knobs can be arranged in any physical configuration desired. . When attached to other Turn boards, rotary potentiometers will be spaced1" apart. Boards are designed with 0.1" spacing so they will work with standard 0.1" pin headers, terminal blocks, and perforated boards. The board can be plugged directly into a standard 0.1" breadboard.

A. Connections

Turn boards have five connections labeled JP1,JP2,JP3,POS,NEG. There are matching connections on all four sides and they are all connected together. The POS (positive) and NEG (negative) connections are for the three string backlight LED circuit. When used with other Turn and Slide boards, POS and NEG connections are designed to be daisy chained together with wire jumpers. JP1 and JP2 are common connections for the potentiometer. When used with other Turn or Slide boards, up to 8 boards can be daisy chained together as long as one pair of JP1 and JP2 are connected with a wire to the corresponding analog section of the Breakout Board (each pin header on the Brain can take up to 8 analog controls). JP3 is the wiper signal of the potentiometer. Each Turn JP3 pin needs a dedicated wire connected to the JP3 pin of each CC line of the Breakout Board.

B. Potentiometer Connections

These connection are for a 9mm snap-in board mounted potentiometer. Turn works with a standard 9mm snap-in board mounted potentiometer. Here are a few confirmed rotary pots. Alps Metal Shaft Rotary Pot w/ detent Alps Metal Shaft Rotary Pot Alps Plastic Shaft Rotary Pot

C. Backlight LEDs

The onboard backlight LED circuit features three LEDs that can be either 3mm through-hole or 0603 surface mount. These connections correspond to the positive and negative (POS,NEG) solder holes on all four side connections. One set of POS and NEG will need to be wired to a set of connections on the Indicator LED section of the Breakout board.

D. Resistor

This is for either a standard through-hole resistor or 1206 surface mount resistor. The resistor is used to set the voltage for the LEDs used. You can use a resistor calculator to determine the resistor value needed such as: http://led.linear1.org/led.wiz.

E. Capacitor

The Turn board features an onboard place for either a through-hole or 0805 surface mount capacitor. We suggest using a .01uf capacitor for noise reduction.

Backlight Circuit

The backlight circuit is a string of LEDs with a resistor to control voltage. The backlight LEDs are intended to be constant on or off not controlled by the builder brain and require a 12 volt power source.

Specs:

Individuals board size 1"x1"

POS - Positive LED backlight circuit
NEG - Negative LED Backlight circuit
JP1 - Potentiometer common ground
JP2 - Potentiometer common voltage
JP3 - Potentiometer wiper

Contains:
Rotary potentiometer pad
3 - through-hole 3mm LED pads
3 - 0603 SMD LED pads
2 - corner mounting holes
1 - through-hole resistor pad
1 - 1206 SMD resistor pad
1 - through-hole capacitor pad
1 - 0603 SMD capacitor pad

Turn Schematic
Technical Specs
Turn 4x4 Dimensions - Adobe Illustrator
Turn 4x4 Dimensions - DXF