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Gearbest Tronxy X8 220 x 220 x 200mm Desktop DIY 3D Printer
Tronxy X8 220 x 220 x 200mm Desktop DIY 3D Printer only $139.99

Gearbest Hubsan H117S Zino GPS 5.8G 1KM FPV with 4K UHD Camera 3-Axis Gimbal RC Drone - RTF
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Gearbest 37-in-1 Sensor Modules Kit
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Whistle detector - Part list




whistle detector Arduino


LM324: LINK eBay
Electret mic: LINK eBay
Arduino NANO: LINK eBay
10 turn Pot: LINK eBay
Capacitors: LINK eBay
LCD: LINK eBay
Relay: LINK eBay
5V LED strip: LINK eBay
IRFZ44N MOSFET: LINK eBay

You have the full part list above.