Piezo mics. Can be mounted any acoustic instrument including Guitars, violins, Mandolin, Nanjo, Ukulele, dulcimer, pianos, horns, harmonicas to pick up Hello everyone! I was just looking to buy a piezo / contact mic to play around with, just to figure out the possibilities. Includes fastening tapes but not putty attachment options. Piezo elements come in handy when you need to detect vibration or a knock. TDK and InvenSense’s analog and digital microphone portfolios build on a strong heritage of industry firsts, including continuous improvement of MEMS microphone SNR, ever-higher integration levels, and even lower power consumption. Plug to your amp, bass amp or other recording equipment. 6" cable. Advantages and limitations of existing microphones are presented with the impact of process parameters during the thin film growth. In piezoelectric microphones, the thickness, length, width of the piezoelectric and electrode materials are key parameters that need to be optimized in the design loop. Dec 1, 2015 · Today's blog post is written by Glen van Alkemade of Zeppelin Design Labs. And just one of those three ‘good’ contact mics cost ten times more than all the others combined, simply because the people who created them understood rule number one. Unlike traditional dynamic or condenser microphones, crystal microphones contain a crystal element that generates voltage when mechanical pressure is applied. They seem to cause grief when used as contact mics. I personally feel that the piezo works fine in this kind of style. Rugged Microphones & Accessories for Challenging Environments Test and Measurement microphones require a very thin and delicate sensing element in order to achieve their accuracy, high sensitivities, and low noise floor specifications. The sounds is clear and there's a lot of place to experiment with these. Placing the microphone in an enclosure or otherwise modifying the original sensor will change its resonant frequency. And guitar pickup can be sticked near sound hole with self-adhensive, easy and We would like to show you a description here but the site won’t allow us. Mar 24, 2023 · 【2pcs Piezo contact microphone pickup & 6pcs Guitar Picks】 Professional piezoelectric contact microphone cartridge -1/4 inch (approximately 0. 7 Noise floor of a piezoelectric MEMS microphone with a 18. They function on the following principle: When certain crystals are placed under mechanical force, a voltage is produced. Oct 16, 2021 · Contact piezo mic vs under saddle Acoustic Amplification Crystal microphones are also called piezoelectric microphones. Jun 7, 2017 · Field recordists capture these types of sounds using contact microphones, also known as pickup or piezo microphones. Able to eliminate external sounds interference and not be influenced by sound reflections from nearby objects. I show you the This piezoelectric microphone targets consumer applications: smartphones, wearables and the Internet of Things (IoT). epoxy as seen in step 2. No need drill hole, Works by contacting with the sound source directly, and just plug it into your amp, bass amp or other recording equipment. The first Shure ceramic microphone appeared in the 1957 catalog as the Model 215. The only thing you need to keep in mind is that the Piezo disc needs to sit flush with its container so it can make actual contact with the object you are going to Introduction Are you interested in creating your contact microphone circuit for audio recording or experimentation? A contact microphone, also known as a piezo microphone, is a device that captures vibrations from physical surfaces and converts them into electrical signals. . See full list on zachpoff. Aug 8, 2023 · The piezo clip-on microphone is designed especially for tuners and can be attached to the bell of a brass instrument, the bridge of a violin, or even to a guitar or ukulele. Has anyone got any recommendations on the best piezo mics to buy? For context, I’m looking to create my own diy noise box effects pedal? ( A metal container with a bunch of springs, twangy metal things etc where the mic picks up the vibrations and you can then mess with the sounds. The magnet helps you to stick the microphone easily on metal surfaces and objects. May 21, 2022 · You've probably used piezoelectricity (pronounced " pee-ay-zo- electricity") quite a few times today. At the time, these were important to the home recording and small-scale paging market, but were later replaced by lower-cost dynamic and electret capacitor microphones. Piezos are generally inexpensive, and are very sensitive to vibration. The voltage produced from the sound vibrations can be measured across them. A contact microphone is a piezoelectric transducer that captures vibrations directly from the surface of the material, without picking up surrounding airborne sounds. Sha Feb 4, 2025 · With the development of technology, MEMS microphones, which are small-sized and highly uniform, have been applied extensively. 6 inch (approximately 26. Building your own DIY contact mic circuit is an excellent way to learn about essential electronic components and gain Nov 9, 2024 · Contact microphones, also known as piezo microphones or so-called “piezo mics” are a form of microphone that senses audio vibrations through contact with solid objects. If you wish to have the highest fidelity possible, only apply the 5min. Choose between Piezo Snore Sensors and Snore Microphones. They can also be used for a very small audio transducer such as a Buzzer. Dec 24, 2019 · Buy Guitar Acoustic Clip On Pickup Universal General Piezo Microphone for Guitar Mandolin Bouzouki Violin Banjo Ukulele: Pickups & Pickup Covers - Amazon. They resonate sharply in the mid-range, producing a noticeable ringing or honking coloration to the sound. 8Sc0. A lumped element model of the prototype is derived and employed for device design. 6 cm) jack and 10. Because the piezoelectric effect directly transduces mechanical sound energy into an electrical signal, our microphones can function as a quiescent sound sensor. When making a test mic without it, I noticed it was way to fragile. 78 4. Follow this guide. Dynamic and electret-type condenser cartridges supplanted crystal and ceramic microphones in the 1960s. All just arm-chair advice it's an interesting problem, trying to passively combine a bunch of piezoelectric transducer outputs! But to reiterate I don't have experience with piezo mics per se, you shouldn't expect these speculations to be 100% well founded. With the guide of a fundamental Pre-amp circuit it may also serve to Electrify an Acoustic Guitar, where amplification is essential. Mar 31, 2025 · This work describes a hybrid micro-electro-mechanical-systems (MEMS) microphone based on combined piezoelectric and capacitive transduction mechanisms to enhance the sensitivity. This makes them sensitive to acoustic vibrations and they can produce a voltage in response to sound. The idea is to do this without tapping into the piping while keeping the microphone immune to external noise. A piezoelectric disk produces a voltage when deformed. And if you are using the piezos for hydrophones, to capture underwater sound… 10PCS 41mm Piezo Disc Transducer Contact Microphone Trigger Sound Sensor with 3. Introduction to Piezo Transducers and Contact Mics Piezo transducers, also known as contact microphones, are an essential tool for sound designers, musicians, and audio enthusiasts. This article serves as an introduction to crystal Piezoelectric Microphones, also called Crystal Microphones, were used primarily between 1930 and 1960. com 1-48 of 166 results for "piezo contact mic" Results Check each product page for other buying options. Piezo mics (or transducers as they may be called - a transducer is any device that converts one form of energy to another Oct 3, 2014 · This is the purist approach solution to the tinny contact mic sound problem if you want the lowest electrical noise, or the lowest distortion at higher levels. Comes with double sided tape and self May 25, 2023 · This type of microphone (aka piezo microphone) picks up sound vibrations through direct contact with a surface and, of course, is the same technology that is already embedded in your under-saddle or bridge pickup for those of you who have acoustic guitars with a 1/4" output jack. PCB designed, responding to numerous requests from test engineers, a rugged grid cap that can enhance the lifecycle of a microphone and be interchangeable within other microphone fields (Free-field, Random Incidence, and Pressure). SleepSense offers three sensor technologies for optimal matching with your clinical needs and system specifications. Introduction Most DIY audio enthusiasts are familiar with the standard “tin can mic” (or variations thereof), in which a piezo disc is taped onto the bottom of a tin can and then plugged into a high impedance voltage amplifier, like a guitar amp At PCB Piezotronics, we handle 100% of our microphone manufacturing in-house, ensuring uncompromising quality and performance. I tested several capsules using a 192kHz audio recorder and cheap piezo tweater. The fabrication process for the proposed hybrid MEMS microphone is presented. Apr 27, 2016 · I have a project where I want to connect a piezo to a microcontroller to measure sound level to detect when water is flowing through a pipe. These piezo are meant to capture the vibrations produced by a person exploring haptically these wooden interfaces, and trigger grains of a GrainBuf accordingly. The trick is the preamp – a basic circuit used to match the WHICH VERSION OF THE C-SERIES+ MICS SHOULD YOU BUY? If you are interested in a wide range of applications, such as recording surfaces (bridges, fences, instruments etc), attaching to the outside of trees & plants, and other experimental / extended techniques, then the normal c-cm+ is the ideal option. Feb 16, 2016 · Buy Musical Instruments Pickups Piezo Microphone Contact 3 in 1 for Guitar Violin Ukulele: Pickups & Pickup Covers - Amazon. Great for sound art, sound design, art installations, scientific research,… Microphones - HyperPhysics Microphones A crystal microphone or piezo microphone[30] uses the phenomenon of piezoelectricity —the ability of some materials to produce a voltage when subjected to pressure [b] —to convert vibrations into an electrical signal. 🎶🙏🎸 ABSTRACT This paper describes the design, fabrication, and characterization of a bulk-micromachined piezoelectric microphone for aeroacoustic applications. These microphones use certain crystalline materials which can develop voltage on opposite sides when they are bent or Jan 1, 2024 · MEMS-based piezoelectric microphones have emerged as an alternative to capacitive microphones, making them water and dust resistant and more suitable for use in underwater wireless networking and surveillance [89], [90]. Apologies if this needs to be deleted. Will use this in The most common form of a piezoelectric contact microphone is a metal disk, but piezos may also be found in cylinders or as thin film-like coating. There are four popular types of microphones: dynamic, ribbon, condenser, and piezoelectric. Experimental characterization PCB’s phantom powered preamplifier has a unique modular design that mates with any IEC 61094-4 working class compliant microphone cartridge. These novel microphones exploit the piezoelectric effect of a thin layer of aluminum nitride, which is incorporated in their diaphragm structure. When there is a vibration on a surface of an object, the disc bends slightly which generates a (small) electrical signal. May 1, 2003 · The piezoelectric effect is where certain crystalline and ceramic materials have the property of generating an electric current when pressure or a bending force is applied. . Sep 13, 2025 · A piezo microphone, also known as a contact microphone or a piezoelectric microphone, is a type of microphone that uses the piezoelectric effect to convert Random question, not super related to field recording. The microphone is fabricated on a silicon-on-insulator Aug 6, 2020 · The Vesper VM3011 digital microphone integrates both the ASIC and the piezoelectric MEMS transducer in the same package. Nov 8, 2017 · About this item A professional piezo contact microphone pickup - 1/4" jack with 10. We discussed various transduction mechanisms, including electrostatic Aug 16, 2016 · Contact mics, also sometimes known as piezo microphones or pickup mics, attach physically to vibrating bodies to directly capture the vibrations of the object itself, vs capturing sound waves from the air. Piezo ceramic on metal disc A piezoelectric sensor is the most commonly available contact microphone. This review identifies the issues faced by the microphone Balanced Piezo Contact Microphones: At the illutron art ship, we are using a lot of piezo elements to make contact microphones and hydrophones (underwater microphones) Piezo elements can be a noise nightmare. Dec 16, 2023 · A crystal microphone, also known as a piezoelectric microphone, is a unique sound capture device that utilizes the piezoelectric effect to convert sound waves into electrical signals. A magnetic pickup is largely unaffected by the sort of vibration that causes "rumbling" or "humming" feedback with piezo pickups, and also doesn't pick up sound out of the air, so it doesn't suffer from the "screeching" feedback that microphones often do Nov 7, 2018 · About this item Widely application - Be suitable for acoustic guitar, violin, Mandolin, kalimba, Idiopan drum, cello,banjo and ukulele etc. The problem with piezo guitar pickups and contact mics is that they are not well matched to typical audio inputs. A piezoelectric microphone is a device designed to capture sound waves and convert them into electrical signals, based on the piezoelectric properties of some crystalline substances, which are capable of generating potential differences when subjected to some type of mechanical pressure. It sounds great but his site is offline. In each case, motion of the diaphragm produces a variation in the electric output. Mar 14, 2019 · VM1010 ZeroPower Listening™ Piezoelectric MEMS Microphones Vesper's low-noise, single-ended analog MEMS microphones provide an ultra-low power always-listening solution The VM1010 from Vesper is the world's first ZeroPower Listening ™ piezoelectric MEMS microphone. Apr 25, 2019 · El mic piezoelectrico permite la amplificación de sonidos mínimos y sutiles, texturas que completan la información de la escena, pero que si son reproducidas desde parlantes pierden la ubicación natural de la fuente sonora y provocan un corrimiento del verosimil que entra en tensión con lo visto. Device design and fabrication Working principles MEMS piezoelectric microphones operate based on the principle of the piezoelectric effect, wherein a thin film comprising piezoelectric layers and passive layers undergoes deformation under sound pressure and induces stress. An assortment of these is shown below. Adaptive ZeroPower Listening (ZPL) technology automatically "learns" the acoustic characteristics of the environment in real-time, allowing the system to ignore background noise and only wake in response to keywords or other desired acoustic triggers. piezoelectric contact microphone pickup, violin microphone pickup, cello erhu ukulele mandolin guitar microphone pickup 238 $798 FREE delivery Sat, Jun 14 on $35 of items shipped by Amazon The increase in sensitivity at high frequencies is a characteristic of the plane wave tube. Jan 4, 2025 · The final project will have different mics attached on the backside of CNC-milled wooden boards. Alex Rice Piezo Preamplifier Alex Rice designed a phantom-powered preamplifier for piezo contact mics and hydrophones. The piezo discs are a layer of crystal in the center of a thin brass disk. Premium Design And Build - Made of high-grade ABS,braid nylon and double shield oxygen-free copper cable, Unique Jul 16, 2021 · Test Report: Under Saddle Piezo vs. A microphone is an acoustical-to-mechanical-to-electrical energy transducer. Cheap Microphones for Ultrasound This page documents my experiments using inexpensive microphone capsules to record ultrasound signals. MkII Features: Extended low-end response for full, rich sound Adjustable bias for optimal performance Crazy Jul 17, 2020 · PAGOW Pickups Piezo Transducer, 3 in 1 Microphone Contact Self-adhesive Mono Piezo Pickup with Buzzer for Electronic Acoustic Guitar Violin Ukulele Jul 16, 2019 · A common use of piezo mics among experimental musicians is in “noise boxes,” ungainly contraptions in which household objects are mounted around and amplified by piezo mics. Different sources pointed out that when you work with Piezo contact mics it’s best to use a pre-amp to get the best possible audio quality. This review paper provides a comprehensive overview of the materials and methods employed in these microphone technologies. Our extensive range includes condenser, modern prepolarized, traditional externally polarized, array, probe, low-profile surface, hazardous approved and other specialty-purpose microphones, preamplifiers, and accessories. Unlike conventional microphones, which record sound waves traveling through the air, contact microphones convert mechanical and structural vibrations into electrical signals. Apr 1, 2022 · Abstract Nowadays, the piezoelectric transduction mechanism has a great concern to be used in the (micro-electromechanical systems) MEMS microphones. Unlike conventional microphones that detect airborne sound, contact mics are designed to sense direct physical vibrations, making them ideal for a wide range of experimental, musical The Cortado MkII Balanced Buffered Contact Mic kit contains a phantom-powered circuit that balances the signal from a piezo transducer and matches its high output impedance to the low input impedance typical of consoles and recorders. Nov 11, 2011 · At a guess I’d say I own over a dozen piezo/contact mics of various forms, bought over the last dozen years, but only three of them deliver seriously useable results. Piezo microphones (piezoelectric efect) Contact (pickup) mic no medium/good (very) good excellent (very) good low Mic pre-amp building a pre-amp box for contact microphones finished pre-amp for the contact mic connected to my Zoom H5 Phantom powered input. Sep 14, 2022 · When were Piezoelectric Microphones first made? Is a Piezoelectric Microphone the same as a Crystal Microphone? Where can you place a Piezoelectric Microphone? All your piezo-related questions — answered. Like all transducers, a piezo disk may be used in the opposite kind of application: induced electricity will cause the disk to vibrate, even resonate at distinct pitches. Other articles where crystal microphone is discussed: microphone: …of a piezoelectric crystal (crystal microphone). Apr 21, 2020 · Unlike Rochelle salt, barium titanate did not lose its piezoelectric characteristics when exposed to high heat or humidity. 2N. Linear Contact Microphone on a Acoustic/Electric UBass Sep 12, 2009 · Contact microphones are actually piezoelectric transducers and are mostly used for producing sound as buzzers, beepers and small speakers in electronic devices. Sep 11, 2023 · A contact microphone, otherwise known as a piezo microphone, is a microphone a flat microphone that's placed directly on the soundboard (body) of an instrument. You'd really have to experiment with this though. The microphone uses a piezo element to directly capture the vibrations and send them to your tuner. Oct 31, 2016 · About this item Widely application - Be suitable for acoustic guitar, violin, Mandolin, kalimba, Idiopan drum, cello,banjo and ukulele etc. To improve their reliability in extreme environment and overcome the constraints of traditional microphones, this article presents a piezoelectric bimorph MEMS microphone using Al0. CLICK HERE TO DOWNLOAD THE IFU Apr 13, 2017 · PUI Audio's piezoelectric MEMS microphone is suitable for voice user interface, IoT products, wearables, smartphones, and smart home devices. By proper design, a microphone may be given directional characteristics so that it will pick up sound primarily from a single direction (unidirectional), from two directions (bidirectional), or Dec 28, 2016 · I'd like to connect about 6 contact mics to my arduino and receive simultaneous signals to be used in my computer for an art installation. If you've been writing a letter or an essay on your computer with the help of voice recognition software, the microphone you spoke into probably used piezoelectricity to turn the sound energy in your voice into Nov 8, 2024 · MEMS piezoelectric microphones operate based on the principle of the piezoelectric effect, wherein a thin film comprising piezoelectric layers and passive layers undergoes deformation under sound Feb 25, 2013 · Korg CM200 Clip-On Contact Microphone The CM-200 is a contact microphone that can be attached to the bell of a brass instrument, the bridge of a violin, or even to a guitar or ukulele. It’s a soft plastic yet pretty sturdy and easy to work on. Resonant contact mics are typically made with cheap piezo benders. They are simple to make and attach easily to the acoustic guitar. Try Trance Audio and Barcus Berry. Jan 1, 2024 · Microelectromechanical systems (MEMS)-based piezoresistive and capacitive microphones have gained significant attention due to their miniaturization, high performance, and diverse applications. Jul 3, 2024 · In an effort to find a solution for the measurement of high-level acoustic fields, microphones with the piezoelectric coupling principle have been proposed. For each mic you’ll see a spectrograph showing a frequency sweep through the ultrasound range from 100kHz down to 28kHz. 【Easy to Install】Standard 1/4-inch female jack with 10 inch cable for amplifiers, preamps or other recording equipment, including fixing clip, for easy connection. Of course, you can use t… SleepSense Snore Sensors attach on the patient’s neck to provide clear, artifact free and qualitative indications of snoring and respiratory sounds. PIP Piezo Preamplifier A very low noise piezo preamp that runs on plug-in-power (“PIP”) from small recorders. People are intrigued by the incredibly direct sound and the interesting look and lo-fi character. These microphones reject air vibrations and defer to capturing sound transmission through materials themselves. Does anyone have experience with this kind of mics, any tips or Apr 22, 2014 · Salvage the piezo from an old toy and use it to build a small contact microphone that can be used to amplify acoustic instruments. Jul 31, 2025 · Contact microphones, also known as piezo microphones or surface microphones, are a unique type of microphone that picks up vibrations from solid objects rather than sound waves traveling through the air. They seem to promise a lot, but easily sound rough as commonly applied. If the signal is reversed using a piezo transducer as a mic instead of a primitive speaker, you’re actually picking up vibrations and having it produce voltage rather than consume it. The only downsides are that Make a Contact Microphone: A contact microphone is a type of microphone that picks up vibrations from contact with objects, as opposed the the more common type of microphone that picks up pressure waves in air. Sep 8, 2015 · These guitar, piano or violin contact mics often include an impedance matched preamp for the very best sound quality. com FREE DELIVERY possible on eligible purchases What are your thoughts about piezo-mics? Do you prefer them in certain situations? Have you installed them by yourself? In this Balkan orginated song I use together piezo and Yamaha's SRT pickup system. 94 Inches Wires for Acoustic Instrument，Mic Drum Trigger Acoustic Pickup CBG Guitar Oct 16, 2024 · Piezoelectric MEMS microphones (PMMs) have attracted increased attention in home automation, wearable devices and autonomous driving, since the high l… Even the most careful engineer has experienced microphone stands falling or microphones being dropped. Applications may subject these microphones to challenging environmental conditions. Sep 30, 2018 · Descriptions: Professional Piezo Contact Microphone pickup - 1/4" jack with 10 inch cable. The microphone was fabricated by combining a sol-gel lead zirconate-titanate (PZT) deposition process on a silicon-on-insulator (SOI) wafer with deep-reactive ion-etching (DRIE) for the diaphragm release. For much more on the subject of piezo mics, pick up Future Music 295, which is available in both digital and print formats now. InvenSense combines the capability to sense audio along with a wide sensor portfolio, capturing motion, pressure, air quality and ultrasonic information. It also Generate sound when voltage is used on it. Price and other details may vary based on product size and color. Contact microphones pick up sound by being in direct contact with the sound source. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. In the article, the high robustness of piezoelectric microphones and the The piezomagnet is an active professional contact microphone with magnet powered by 12V-48V phantom with a strong enhanced balanced audio signal thanks to customized symetric jfet preamplifier. Here's a demo of a contact mic attached to an alarm clock, along… Recording resonant sound sources with a larger frequencies bandwidth than passive piezo mic , balanced signal and a good N/S ratio. Piezo Sensors by their nature do not have very high fidelity and are meant to be paired with outside microphones. The 'ecoutic' version was designed alongside the techniques Jez developed for recording in a Making a DIY contact (or surface) microphone with a piezoelectric sensor is easy. I often get questions about the contact microphones I use in live performances. Premium Design And Build - Made of high-grade ABS,braid nylon and double shield oxygen-free copper cable, Unique A contact microphone is a small flat piezo disk/element that translates physical surface vibrations into voltage. I posted his files and made some changes of my own. com FREE DELIVERY possible on eligible purchases how to use piezo transducersWhen most people think of piezos, they think of the shiny, round contact microphones – the gold coins of experimental music! But, there are many different types of piezos, and they can be used as actuators as well as sensors. 4 kHz resonant frequency at room temperature. Oct 31, 2019 · About this item 【Professional Piezo Pickup】Professional piezo contact microphone pickup components can help you capture clear and accurate sound. Piezo mics aren’t usually considered … Piezoelectric microphones operate on a completely different phenomenon – the direct conversion of mechanical sound energy into electrical energy via the piezoelectric effect. Piezo disc and container I used the lid from this vitamin bottle as a container for the Piezo element. Piezoelectric (crystal) microphones Certain materials response to pressure and stress by release a voltage, and this effect – known as the piezoelectric effect – has been used as the basis for a whole category of microphones. The Barcus Berry 4000 Planar Wave System incorporates a piezo Crystal Sensor boundary mic and state-of-the-art 4000XL piezo preamp to capture grand piano and harp with full-spectrum frequency response and perfect amplitude balance across the entire instrument while achieving excellent feedback rejection and isolation from ambient sounds. If you've got a quartz watch, piezoelectricity is what helps it keep regular time. Unlike regular microphones, contact mics detect audio vibrations through conta Sep 15, 2020 · Piezoelectric Disc as the Sensor A piezoelectric disk generates a voltage when deformed. It is made of a thin piezoelectric ceramic disc glued to a thin brass or alloy metal disc (see image). Please note the MkII is only offered as a DIY kit. I've seen some really cheap deals in amazon regarding piezos for acoustic instruments, but I'm not sure if they'll be worthless for me (I just want to stick mic to things and record vibrations). Is there any suggestions as to what piezo Sep 3, 2025 · What About Magnetic Pickups? A magnetic pickup is a common alternative to piezo-based pickups for players who play in high-volume situations. 9 cm) cable 【Contact-type 】Contact microphone captures sound by directly contacting the sound source 【Eliminate interference】 It can eliminate external sound interference without being affected by Nov 1, 2022 · This paper presents a comprehensive literature survey of MEMS based piezoelectric microphones along with the fabrication processes involved, application domains, and methodologies used for experimentations. Nonetheless, I don't know what's the ideal way to go. Homemade Piezo Microphone: As a guitar player, I wanted a cheap and easy way of building my own Piezo Microphone. Just plug it into your amp, bass amp or other recording equipment. Such a device uses a high impedance input buffer. Great microphone for field recording, sound art, art installation and sound design but also for classic acoustic Struggling to get a great piano tone? Here are the 5 best techniques you can use to mic a piano, as well as the microphone recommendations for a pro sound! Jun 6, 2025 · Contact mics enable you to feel uncommon sounds when connected to numerous surfaces. It also positions Vesper to compete with Knowles, Goertek, STMicroelectronics and others for applications in harsh environments. [3] Contact microphones based on piezoelectric materials are passive and high-impedance, and they sound tinny Using Piezo Contact Mics right Cheap, innocent looking piezo elements do okay as greetings cards sounders. 2g xzo yaeu zhidbdz bz6m nyxajthl l4tt ycfazk go 25cwn