Is there a way to make the driver circuit fit into a smaller place?
Or is it small in the picture, I honestly can't tell. There's no size reference.
Also, I can't find handpieces ANYWHERE.
Every diode as at least 3 pins.
Positive pin.
Negative pin.
Grounding pin.
The "middle" pin you keep referring to that is connected directly to the case of the diode, is the grounding pin.