Reference

Robot Butterfly Assembly - Chapter 3/14

Solder the 10k Ohm resistors: R2, R4, R8, R9. The polarity does not matter.

10k Ohm colour code is: Brown, Black, Orange, Gold.

Solder the 330 Ohm resistors: R3, R5, R6. The polarity does not matter.

330 Ohm colour code is: Orange, Orange, Brown, Gold.

Solder the 2k Ohm resistor: R1. The polarity does not matter.

2k Ohm colour code is: Red, Black, Red, Gold.

Solder the yellow LEDs: D1, D2. The polarity is such that the flat side of the LED faces flush with the edge of the cutout. The square pad is Gnd.

Solder the buzzer: BZ1. The polarity does not matter. The black portion should be facing up.

Solder the transistor 2N2222: Q1. The polarity is such that the flat of the transistor matches the drawing on the silkscreen. The black portion should be facing up.