Hello!
The AJAKs are simply bipolar LEDs housed inside a 3.5mm mono jack. The two LEDs respond to different polarities of voltage, as shown below:
AJAK1:
+ = Red
- = Yellow
AJAK2:
+ = Blue
- = Red
The colours fade in and out, so at 0V the LED is totally dim, whilst with increasing magnitude of positive or negative voltage, that assigned colour becomes brighter.
I really must make a video of these in action - they're super cool! Expect something on Youtube soon
