Item Link QTY Raspberry Pi Pico W https://www.adafruit.com/product/5544 1 12V Power Supply https://www.adafruit.com/product/4880 1 5V Step-Down Converter https://www.adafruit.com/product/1466 1 Barrel Jack https://www.digikey.com/en/products/detail/tensility-international-corp/54-00063/6206244 1 Power Switch https://www.digikey.com/en/products/detail/e-switch/RR3112ABLKBLKNFF0/1589375 1 Speakers https://www.adafruit.com/product/1314 2 Amplifier https://www.adafruit.com/product/1752 1 Digital to Analog Converter https://www.adafruit.com/product/3678 1 Opto Coupler 4N35 1 Diodes 1N4001, RL207 1 Power Mosfet IRFZ44N 1 Permanent Magnets https://www.kjmagnetics.com/d41-neodymium-disc-magnet?srsltid=AfmBOoqX5QSYfH9Br4u6VB6d0PGNB2tcBJuptexQ-pBq5WYRsY6VNTj8 6 Electromagnet https://www.adafruit.com/product/3875 1 Ferrofluid https://www.amazon.com/dp/B0DBW2NH7X/ 1 Volume Encoder https://www.digikey.com/en/products/detail/bourns-inc/PEC11R-4025F-S0024/4699199 1 Volume Knob https://www.digikey.com/en/products/detail/kilo-international/OEDNI-63-2-7/5970329 1 Buttons https://www.adafruit.com/product/1505 3 LED Strip https://www.adafruit.com/product/1506 1