Step 17: Inductor, Diodes
Note: Be careful– the diodes have to be put in with correct polarity (orientation); the negative end is denoted by a black band around the diode body. The silkscreen outline also shows a (white) stripe – when properly installed, the black diode band should match the white silkscreen stripe. Note that the orientation is not the same for all diodes – see picture below. Installing the diodes the wrong way around will prevent the instrument from working and may even damage the diodes.
The inductor on the other hand is not polarized and can be put in either way.