1 x Arduino NANO LINK eBay
2 x 40KHz speakers: LINK eBay
1 x MAX232: LINK eBay
1 x LM324: LINK eBay
3 x 5k potentiometer: LINK eBay
3 x 100k resistor: LINK eBay
3 x 10k resistor: LINK eBay
1 x 100R resistor: LINK eBay
5 x 100nF capacitor: LINK eBay
5 x 10nF capacitor: LINK eBay
1 x BC557 PNP: LINK eBay
1 x drilled PCB: LINK eBay
PCB pins: LINK eBay
Wires LINK eBay
Wire, soldering iron, solder, etc...
