Instructions

28
14 red – green – white
Another cable can be used to connect the third port of the
potentiometer. This allows you to adjust the electrical voltage
in the circuit. There are three LEDs connected to the slider of
the potentiometer. The red and green LEDs have their own
series resistor. Although the white LED is connected directly,
at full brightness, the resistance is 470 Ω.
If you turn the knob all the way to the left, all LEDs go out. By
turning slowly to the right, first the red LED will turn on, then
the green one and finally the white LED. In other words: The
red LED needs the least voltage; the white LED the most. You
can also test the yellow LED once and use it instead of the
red or the green LED.