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| research:contact_mics [2017/03/19 01:29] – [Credits] mrkva | research:contact_mics [2019/05/15 12:09] (current) – old revision restored (2018/05/27 21:36) mrkva |
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| ==== Resonance ==== | ==== Resonance ==== |
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| Piezos do not detect vibration frequencies in a linear manner. Although they can have an extended frequency range, they have a characteristic resonance that varies with the diameter of the disc. This resonance is usually between 2 and 6 kHz, producing a "metallic" or "honky" sound. The resonance can be reduced by increasing the mass of the disc. However, this can adversely affect the overall sensitivity of the element. A good strategy is to increase the mass of the metallic part, while not excessively loading the central ceramic portion. | Disc piezos do not detect vibration frequencies in a linear manner. Although they can have an extended frequency range, they have a characteristic resonance that varies with the diameter of the disc. This resonance is usually between 2 and 6 kHz, producing a "metallic" or "honky" sound. The resonance can be reduced by increasing the mass of the disc. However, this can adversely affect the overall sensitivity of the element. A good strategy is to increase the mass of the metallic part, while not excessively loading the central ceramic portion. |
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| A comparison of two different bodies is demonstrated in the following video. Notice the "tone" of the piezo without additional mass: | A comparison of two different bodies is demonstrated in the following video. Notice the "tone" of the piezo without additional mass: |
| * [[http://cafewalter.com/pzp-1/how-to-purchase/|Walter Harley]] sells the PZP-1 Piezo buffer for $49. Uses 9V battery. | * [[http://cafewalter.com/pzp-1/how-to-purchase/|Walter Harley]] sells the PZP-1 Piezo buffer for $49. Uses 9V battery. |
| * [[http://www.yannseznec.com/works/custom-contact-mic-preamps/|Yann Seznec]] builds boutique amps, based on Zach Poff's circuit. | * [[http://www.yannseznec.com/works/custom-contact-mic-preamps/|Yann Seznec]] builds boutique amps, based on Zach Poff's circuit. |
| * [[http://tritonaudio.com/bigamp-pi%C3%ABzo.html|Triton Audio BigAmp Piëzo]] is a phantom powered piezo buffer. | * [[http://tritonaudio.com/bigamp-pi%C3%ABzo.html|Triton Audio BigAmp Piëzo]] is a phantom powered piezo buffer |
| * [[http://pulplogic.com/product/ctact-box/|CTACT Box by Pulp Logic]] is a coin-cell powered impedance converter | * [[http://pulplogic.com/product/ctact-box/|CTACT Box by Pulp Logic]] is a coin-cell powered impedance converter |
| | * [[http://www.radialeng.com/stagebugsb4.php|Radial StageBug™ SB-4 Piezo DI]] is phantom powered "active DI optimized for piezo transducers" |
| | * [[http://www.stompville.co.uk/shop/26-phantom-piezo-preamp.html|Stompville Phantom Piezo Preamp]] is phantom powered piezo preamp module |
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| ==== Other resources ==== | ==== Other resources ==== |
| * [[http://www.musicofsound.co.nz/blog/the-first-rule-of-contact-mic-club|The first rule of CONTACT MIC club]] by Tim Prebble | * [[http://www.musicofsound.co.nz/blog/the-first-rule-of-contact-mic-club|The first rule of CONTACT MIC club]] by Tim Prebble |
| | * [[https://www.zachpoff.com/resources/building-contact-mics/?highlight=contact|Building Contact Mics]] by Zach Poff |
| | * [[https://www.zachpoff.com/site/wp-content/uploads/David-Dunn-Microphones_Hydrophones_Vibration-Transducers__Rolling_Your_Own__Dunn2007.pdf|Microphones, Hydrophones, Vibration Transducers: Rolling Your Own]] by David Dunn |
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| ==== Credits ==== | ==== Credits ==== |
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| Authors, editors and contributors (listed alphabetically): | Authors, editors and contributors (listed alphabetically):\\ |
| Jonas Gruska, Jerry Lee Marcel, Robin Parmar, Terry Setter | Till Bovermann, Jonas Gruska, Jerry Lee Marcel, Robin Parmar, Terry Setter\\ |
| Videos by Jonas Gruska | Videos by Jonas Gruska |