Component List

Resistors

R1 = 6.8 Ω resistor, 1/8 W
R2 = 220 Ω resistor, 1/8 W
R3 = 330 Ω resistor, 1/8 W

VR1 = 1 kΩ potentiometer

Capacitors

C1, C2, C3, C5 = 0.1 μF, 25 V capacitor
C4 = 1000 μF, 25 V capacitor

Semiconductors
D1 = 1N4004 diode
DS1 = 5 mm LED
U2 = WS2812 8-LED stick
U3 = AD8307 logarithmic amplifier IC

Miscellaneous

J1 = DC power jack
S1 = SPST switch
U1 = Arduino Nano
Enclosure: Solarbotics Mega S.A.F.E.