Acoustic earbuds for crystal radio smart phones and stethoscope
thingiverse
This is a 3-in-1 Acoustic earbud that can be connected to smart phones to replace the electrically connected earbud as the acoustic earbud taking sound from the speaker in the smartphone. It can also be used to listen to crystal radios in similar ways with a speaker box. There is also an adaptor to turn this into a stethoscope to listen to your heart bit. Refer to this youtube video for demonstration and my blog for more detials.
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