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Transducer for contact mic usage
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Transducer for contact mic usage
saemola
Hey guys,

does anyone here have any experience in using transducers to transfer a signal from your audio interface to a surface and then record the result with a contact mic (or "regular" airborne sound waves).
I'm looking for either a commercial product or a very simple DIY project.
so far all I could come up with is this: www.whd.de/en/das-whd-soundwaver.html
pulplogic
I have been doing some experimentation with surface transducers. You might want to look at the exciters from Tectonic Elements. They will need to be driven by a small amplifier.

http://www.tectonicelements.com/audio-exciters/

or Sparkfun
https://www.sparkfun.com/products/10975
https://www.sparkfun.com/products/10917

Tangentially related. Here I am exciting the springs of a reverb with a surface transducer.
https://www.youtube.com/watch?v=fl63mZpakf0&list=HL1402578533&feature= mh_lolz
Barnetric
It doesn't look like a simple or small project to me, but there are some good resources on DIY plate reverbs out there.

http://nicksworldofsynthesizers.com/plate.php

http://www.prosoundweb.com/article/how_to_build_your_own_plate_reverb/ P2/

I love plates!
Tombola
You can just about use one peizo element as the transducer and another as the microphone.
Seemed to be a lot less interesting than I hoped when I tried it with panels/bits of wood. Obviously fun with plates / slinkies
Jarno
Been wanting to build a plate reverb using a vidsonix ghost transducer, originally used for sound in pools. Basically a speaker without cone.
Pretty good apparently. I've seen them listed on ebay

http://m.ebay.com/itm/Vidsonix-Sonic-Ghost-3-Tactile-Transducer-1-Unit -/350469285633
Jarno
I wonder how well a sheet of glass will work as a plate reverb, anybody try this?
nathanxl
Jarno wrote:
I wonder how well a sheet of glass will work as a plate reverb, anybody try this?


http://youtube.com/fbM38VghFnk
pulplogic
Jarno wrote:
Been wanting to build a plate reverb using a vidsonix ghost transducer, originally used for sound in pools. Basically a speaker without cone.
Pretty good apparently. I've seen them listed on ebay

http://m.ebay.com/itm/Vidsonix-Sonic-Ghost-3-Tactile-Transducer-1-Unit -/350469285633


This looks perfect for something I want to try. Thank you!
saemola
thanks all for the great suggestions!
johnbron
does it need to be fixed to the plate or just touching? I need some help on how the tranducers are actually attached to plate reverbs. thanks.
electricanada
I don’t know if anything’s changed since 2014, but I do know that today transducers are abundant and easy to find. I’ve been meaning to get one to experiment with string feedback in a zither, but there are so many I don’t know which one to buy.
EATyourGUITAR
contact mics are piezo crystals on a circle of brass. they have a resonant peak for use as a speaker or microphone. pvdf is much flatter in frequency response for a contact mic. traditional transducers or diy made from old speakers work great as an exciter. the hard part is getting everything to make good solid contact with dense materials without sacrificing the acoustic properties of lightweight cavities. I destroyed a shaker box with too much glue on the transducer. it was impossible for it to have any sympathetic vibration after I increased it's mass by attaching a pile of glue that is way too high of a durometer.
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