Trimmer
The VU Meter Kit features a 25-turn trimmer potentiometer. This is used for calibrating your VU Meter. (More
on this later.)
LED – Light Emitting Diodes
LEDs are a special kind of diode that lights up when current goes through it. We’re using low-current, high
e
ffi
ciency LEDs for the VU Meter Kit. These are crystal clear when OFF, and bright RED when turned ON. Insert
the LEDs with the longer legs on the left side, looking at the VU Meter PCB from the front.