Questions tagged [piezo]

Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress.

Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress.

The piezoelectric effect is understood as the linear electromechanical interaction between the mechanical and the electrical state in crystalline materials with no inversion symmetry. The piezoelectric effect is a reversible process in that materials exhibiting the direct piezoelectric effect (the internal generation of electrical charge resulting from an applied mechanical force) also exhibit the reverse piezoelectric effect (the internal generation of a mechanical strain resulting from an applied electrical field).

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Active vs Passive Buzzer

I recently borrowed an Arduino Inland Basic Starter Kit. It includes an active and passive buzzer. What is the difference? I can hear a difference in sound when I use the tone() command. Anything else? How can I identify which one is which? Are…
shurup
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Convert analog piezo "transition" to digital signal

I'm trying to get what amounts to a knock indication into a microcontroller input from a piezo sensor. It's looking fairly good now at the fifth iteration, and about ready to provide digital levels for input to a 3v3 MCU. I started with an…
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How can I create a mist maker with a 9 V DC power supply?

Context Note: I am a beginner with electronics so please provide detailed explanations and add descriptions that are more beginner friendly. I really do want to learn how this all works. I am trying to make a diffuser using a 113 kHz piezoelectric…
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Does a pickup microphone work in space (vacuum)?

Of course in space there is no sound transmitted via air, so there is no air-borne sound, but there is structure borne sound. This sound can be recorded with a pickup microphone, but do pickup microphones need air to work as well? Considering that a…
Karsten Becker
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A peculiar issue in an atomic force microscope

I'm not sure where else to turn for this issue. Hopefully you all can offer some insight. Sorry the title is so vague, I don't know how to explain this concisely. I am a teaching assistant for an introductory engineering lab which teaches the…
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GaN & SiC piezoelectricity problematic?

I read that galium nitride and silicon carbide are piezo materials.Does this cause some problems? I can imagine that unwanted piezoelectricity directly in the circuit path would cause some kind of distortion or noise. Can this be modeled as some…
wav scientist
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Piezo transducer preamp and AGC/compressor

I've been suggested this circuit as a good low-noise high gain piezoelectric transducer preamp (used to pick up really faint sounds in water). It is nice because it includes a high pass filter (yet no AGC or a compressor, which would be useful for…
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Measuring the resonance point of a piezo ultrasonic transducer

I assume it will be something along the lines of feeding it a sine wave via a resistor and measuring the signal across the resistor as the frequency changes. Does this sound viable? Also, on resonance does the current maximize or minimize? A…
user32885
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Are electrical clocks influenced by vibration?

There are many different electrical clocks for generating pulses with constant frequency (e.g. RC oscillators, crystals, OCXOs, MEMS oscillators, chip-scale atomic clocks). If they are mounted on a vibrating device (e.g. an electrical motor of a car…
Alejandro
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Possible causes of ceramic capacitor damage on high-voltage op-amp supply pin

I am working on a waveform generation board. The board contains +-200 V supplies and +-24 V supplies. The board takes a low voltage (+-15 V) waveform from a DAC on separate board and outputs +-200 V waveform. This output powers piezoelectric tubes…
Nirmala
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Sensor to detect ball impact

I want to detect the impact of a ball against a table tennis racket. I'm currently using Piezo discs tightly fixed in the racket wood. However, in addition to correctly detect impact, the sensor also detects sudden accelerations in the racket. As an…
Contaso
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How to detect very hard impacts with piezo?

Normally I'm a software guy, but I've recently decided to try my hand at some electronics projects. What I want to do is make my own impact sensor for target shooting. What I'm picturing is a piece of AR-500 steel for the target, and a sensor that…
campbell.rw
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Unwanted noise/oscillations on op amp output

I am working on a piezo vibration voltage amplifier circuit. The working schematic is attached below. From a 9V battery I am using a 7805 to provide 5V to both my single supply op amp and the 5V power connection on my contact-mic style piezo. I…
Thomas Wilk
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Electronic stethoscope / contact mic not quite working

I built a circuit similar to this one here and I can hear my breathing but not my heartbeat. Now I used this piezo from digi, and I used a FDV301n fet instead of their JFET. Eventually I removed the emitter follower and just put the capacitively…
confused
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Using a piezo disc as an input and output device to ATtiny85

I am working on an art installation and plan to use a number of these small circuits to make sounds, to sense sound/vibration and also to move the device (using a triangle wave output). This link gives examples of input and output using the piezo.…
Rob
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