Quantity   Component name
1 × Arduino Uno
1 × ¼" mono Panel-Mount Audio Jack open-frame, open-circuit that accepts ¼" mono plugs
2 × 9V Batteries
2 × Snap Connectors for 9V battery
1 × Operational Amplifier 741 OP AMP, 8-pin DIP
1 × 10K Ohm Linear-Taper Potentiometer
3 × 100K Ohm Resistors Electronic Components / Misc. Electronic Components
1 × 10μF Electrolytic Capacitor 35VDC maximum, ±20% Tolerance, Radial-lead, 0.059" load spacing
1 × 0.047μF Ceramic-Disk Capacitor 50WVDC maximum, ±20% Tolerance, 5mm load spacing
1 × 16x8 1.2" LED Matrix w/ Adafruit Backpack Square Blue lights