Passive 1870's sound amplificator
by DigitalTargeter, published
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Horn amplificator for your IPhone 4/4s
based on the ducts found on good old gramophones!
Amplifies the sound pressure from 70dB to 85dB ;)
I have printed both parts on my ultimaker using netfabb
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Passive 1870's sound amplificator by DigitalTargeter is licensed under the Creative Commons - Attribution - Share Alike license.
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