loud speaker
thingiverse
A simple functionally loud speaker. Instructions For the coil you need an isolated small copper wire with approximately 20-30 turns (about 1-2meter). The magnet are Neodym with a diameter 20mm and 6mm length. As source i used my mobile phone i attached a connector to the speaker with 3.5 diameter. Don't expect to much , but you will hear a quit music.
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