DIY copper gramophone for Acoustic Amplifier speaker for phones and crystal radio.

DIY copper gramophone for Acoustic Amplifier speaker for phones and crystal radio.
  Billy Cheung
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DIY copper gramophone for Acoustic Amplifier speaker for phones and crystal radio. View this video if you want a pure gramophone Acoustic Amplifier made out of a single piece of wood.  ...   ... 

Tags:
Diy  Crystal  


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