Quantity   Component name
2 × 100K resistor
1 × 4.7uF capacitor (electrolytic)
1 × 200R resistor
1 × Signal generator
1 × Oscilloscope
1 × Amplifier module (LM386) You can normally get these from China suppliers in eBay!
1 × Speaker (4 or 8 ohms)
1 × Arduino Uno or other microcontroller of your choice