DIY Magnetic Stereo Contact Microphones
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With these files, a Piezo disc, and a spare cable, make a set of stereo contact microphones
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Updated at source:
Model information
- Source
- Printables
- Category
- Audio
- License
- Creative Commons — Attribution
Use PETG or stronger. It also sounds better than PLA, from my testing. For fun, I tested running them over with my car, and leaving them outside during a thunderstorm / all night, and they still worked. So pretty hardy!
Parts
27 mm piezo disc(s) (or smaller)
20 mm magnet(s)
any audio cable (for stereo, aux to RCA cables are great)
silicone or epoxy
4x M3 screws (short ones... I don't remember :/)
Steps
Solder the wires to the piezo disc(s)
use super glue the magnets into place. This is tricky, since you want the magnet to protrude just a tiny bit. Might take a couple of tries.
Pay attention to the polarity if you want them to snap together easily for storage
super glue the piezo disc to the magnet. Use a bunch to make sure the space between the disc and the magnet is filled.
Route the wire around the outer shell and out of the hole. Tack it into place with super glue
Fill the cavity with silicone. Overfill it a bit.
Place the top, and screw in the M3 Screws in the corners
Notes
This is like the 10th version of a contact mic set. I learned various lessons along the way including:
Supporting the wire is very important. Hence the wrapping around the whole case strategy
Epoxy is annoying and hard to get of. Silicone is a bit more forgiving, waterproof, and as far as I can tell does not negatively affect the sound.
Buying or making a contact mic pre-amp makes these sound way better. true for any contact mics.