I have no clue sounds like when they use multiple piezos they wire them in series which should give a louder signal. Fluorescent lights will also produce hum, maybe use an incandescent lamp while recording. I see they are exposed so twist them and wrap them in tin foil (this rejects lots of emf). Hum can be dealt with by twisting/braiding your wires. It doesn't matter what direction, it just matters that they make good contact, so yes, glue them down or use some tape. Piezo will create an audio signal from anything they are touching. but it will not capture the audio good, it will sound weak (no bass), you must eq a lot or do something to correct the impedence and that's gonna take a lot of typing to explain, so do what you can with eq. (NB: I did not ground the filter cap through a resistor, to create a high pass filter as I would lose 3db output) You don't want any knocks bangs or Wolf tones to be transmitted below the G string frequency. Place a Capacitor Inline with your Hot output lead (say, at the output jack) to kill unwanted Bass frequencies. (Series is louder but parallel matches impedances better) More than two piezo elements in parallel can be plugged into a Line or Mic input directly. The trick is to wire them In Parallel to lower the impedance. If you put each piezo In Series, you compound the already massive output impedance. So I suggest cutting the piezo output and grafting on shielded cable. The wire from each piezo must be shielded as soon (within 1cm) as possible. I've been working on piezo electric violins as a gigging player and engineer for thirty years and have picked up some tricks. ![]() Thanks for your time, excited to start on version 2.0 ![]() anyone have anything productive to say about that? It sounded good, but very hot (loud) I guess because they are in series the voltage (signal) increases for every one added?ģ.) I also had a wicked hum! Obviously a shielding problem, any suggestions?Ĥ.) last question: I have heard that having reversed polarity is a "good thing" what is that all about? I think that the new generation of Barbera bridges have 8 elements, one on each side of the string, and their polarity is opposite. I cut the discs into rectangles first I stuck them to a bridge to prove the concept, then cleaned up the long cables, and glued them to a bridge and sandwiched them between a thin peace of wood (with a cavity for the solder bumps). It looks to me like their are 4 Piezos wired in series.ġ.) First question: I have some "12mm Piezo Elements Sounder Sensor Trigger Drum Disc + wire copper" are they suitable?Ģ.) Are Piezos directional? it looks like they are perpendicular to the face of the bridge does it matter? It would be much easer to glue them parallel to the bridge. It is inspired by a drawing I found, probably of a Barbera. What I want to do is make a violin bridge pickup using multiple Piezo elements. So I'm not looking for a "go buy one" answer. So firstly I live on an Island, I get my supplies from e-bay, and it takes a month or more to get it here.
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