Convert old speakers into a 2x50W bluetooth model for 7€ with the ZK-502C mini amplifier
thingiverse
For making 45mm inserts (about 2 inches) work, you'll need a few specific items. First, get an amplifier board from this link: https://bit.ly/3dcPRdf. Next, find a power supply that can handle 80 watts of power and has a voltage rating between 12 to 24 volts - an old laptop computer power supply will do the trick or you can check out this alternative: https://bit.ly/3dd12mb. Finally, pick up a 5.5mm jack like the one found here on eBay: www.ebay.com/itm/2-1mm-x-5-5mm-Right-Angle-Male-Plug-Panel-Mount-Socket-Jack-DC-Connector/281790992051. I made an angled connector instead of buying another because it saves money. Check out this video in English for more details: https://www.youtube.com/watch?v=6evgEtWHp1Q
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