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.
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How can we model the piezoelectric behavior of a capacitor to mechanical and thermal transients?
I would like to model the behavior of ceramic capacitor to thermal and mechanical stress.
We are seeing power supply fluctuations during reliability test and suspecting the ceramic capacitors' role in ...
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Piezo voltage generator that mutes the audio signal
I am new to the forum and PCB/circuits altogether so please go easy on me!
I'm a solo musician working on a percussion foot pedal for my performances. The basic idea is you stomp your foot on the ...
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How do you generate an impulse signal in a mechatronic system?
Background:
I have a piezoelectric force transducer that I am using to measure the force produced by a combustion reaction in a tube. The issue is that there is a lot of ringing that occurs during the ...
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Is it possible to create a piezo power generator? [closed]
Piezoelectric effect can be reversed. Hence suppose a crystal and a steel frame with a screw built in it. When putting pressure on the crystal via screwing, a tension should appear between both sides ...
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Simulating IEPE powered sensor and current source
I am trying to create a simulation of an IEPE sensor circuit and get it to match measured behavior of something like a PCB 378B02 microphone connected to such a supply.
IEPE sensor-side amplifier ...
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73 views
How to measure output of a piezoelectric?
I have a (perhaps trivial) question that is buzzing me a bit these days. A brief explanation of the project: I have metallic plate with two piezoelectric sensors attached on each side. One is used as ...
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How to measure the waveform of a piezo igniter?
Is there a (cheap) way to measure the pulse of commercially available piezoelectric igniters like those used in lighters or BBQ grills?
I use them as a cheap (and very crude, for sure) method for ESD ...
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133 views
Impedance matching transformer for piezo acoustic guitar pickup
I am trying to determine the specifics (windings, wire gauge, core material) for an impedance-matching transformer for a piezo pickup on an acoustic guitar. If I can arrive at a 2 megohm input, 20 ...
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Can I increase the inductive component stored-energy of a Piezo Buzzer?
In this example of a model for a piezo element, there is an inductive component (I think this is a quartz crystal model -- it should not matter for the question. This graphic was also used here and ...
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143 views
Buzzer differences and configurations
I want to understand the right way to wire a buzzer. I know there are passive and active as well piezo buzzers and magnetic buzzers. Also, a passive buzzer needs an external source while the active ...
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77 views
step-up transformer design - basics
I want to step up Li-ion battery voltage to ~100-125V at ~145kHz and ~0.5Arms.
(The circuit is to drive a small piezo at its ultrasonic resonant frequency.)
I have limited space.
Are there any rules ...
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95 views
How large is a piezo buzzer's deformation?
For a standard run-of-the mill piezo buzzer (as in the image below), what order of magnitude would the deformation be (compared to 0V) that occurs when driving it within its normal operating ...
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Driving a piezo with digital input (I2S)
In a current project, I'm trying to chirp a piezo sounder in the 40 kHz range.
So far, I chose the PAM8904Q piezo driver, which accepts PWM input.
As it now turns out, my microcontroller cannot output ...
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100 views
Piezo connected to ESP32 - Why doesn't it kill the input?
I have a ESP32, and a piezo disk connected as a sensor:
Piezo - to GND
Piezo + to Analog In
50K Resistor in parallel to piezo
My understandin is that the piezo generates a voltage when it is ...
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1answer
47 views
Could you please tell me resistor parallel with piezo PKLCS1212E4001-R1
Please could you tell me the reason why you add a resistor in parallel with a piezo?
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Purpose of switch in transimpedance amplifier
The schematic below is for a piezoelectric sensor. For the transimpedance op-amp, what is the purpose of the switch (SW1)? To my understanding, when the switch is on the bandwidth is reduced by the ...
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Generate vibration and sense with the same piezo
I would like to build a sensor that generates some vibration on a material and then sense the vibration of the material. The simplest approach seems like using a piezo transducer. Ideally in ...
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44 views
Mimicking the output of a piezo sensor with a membrane potentiometer
High level
I'm trying to use an electronic drum pedal as an electronic drum trigger. My specific e-drum unit has only one pedal input, so I need to repurpose a drum trigger input in order to use more ...
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Can I use Op-Amps to drive a ultrasonic piezo transducer at 200kHz
I’ll admit I’m not the most knowledgeable guy when it comes to electronic circuits, so I thought I’d ask before breaking anything.
I’m looking to drive a piezo transducer using a 200kHz sine wave. The ...
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33 views
Adapting a universal preamp to a piezo microphone
for a school project I'm trying to adapt a universal mic preamp to a piezo mic: obviusly with the original circuit i've obtained a low distortion.
The preamp is a Velleman k1803 mono preamp:
I've ...
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129 views
Do almost all modern smartphones use piezoelectric speakers?
Do almost all modern smartphones use piezoelectric speakers for both the ear speaker and the speakerphone speaker?
The reason I ask is because I rinsed off my waterproof smartphone (which I've done ...
asked May 10 '21 at 22:03
RockPaperLz- Mask it or Casket
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How to surpress coupling between two circuits
I have the following setup:
2 piezo transducers are placed 0.7 meter apart from eachother in water facing eachother. 1 piezo (PA) acts as the sender, the other piezo (PB) acts as the receiver.
PA ...
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101 views
Easiest way to (quietly) drive a 2W 120VAC load (piezo air pump) from MCU-controlled 3V/5V/12V?
I'm trying to drive this piezoelectric air pump that requires 1.5W and runs on 120VAC 60Hz wall power.
This will be controlled by a MCU/CPU of some kind (Raspberry Pi in this instance), so the control ...
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CW Doppler probe for fetal doppler and blood flow velocity
I am currently working on a microcontroller based project to measure the blood flow velocity using ultrasound doppler.
I have purchased two Spengler 8 MHz continuous mode probes in order to measure ...
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Can a MOSFET or transistor be used to switch on a 9V supply using a 3.3V signal?
***Technical question, not a wiring problem.
I am building a bicycle alarm system and I'm a little stuck on the alarm output. I wonder if I am approaching this problem wrong.
My alarm piezo ...
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Touch sensor selection
I am currently researching a touch/force sensor for my project. Purpose of this post is to get your help in sensor selection.
Below is the information about the project so that you can get insight ...
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Help Designing an Impact Detector for Raspberry Pi
I am trying to design a little game where you throw a baseball at a 3x3 grid of 24x18" polycarbonate panels (1/4" thick), and the game detects which of 9 panels is struck. I'm aware there ...
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109 views
Reducing resonance in a piezoelectric ultrasonic transducer
I am using a piezo transducer to launch an ultrasonic pulse in air, at a frequency of 125kHz. A picture of the received waveform is attached. My question concerns how I can (electronically) limit the ...
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1answer
87 views
What is the use of drain diodes in the circuit below?
This TC7920 driver will be driving a piezo electric load which may behave like a capacitive load at certain frequencies. There is another IC TC8220 which is the same except it is not having the drain ...
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52 views
What are the advantages and advantages of ceramic and Langevin transducers for ultrasonic cleaners?
I have an old large ultrasonic cleaner with 5 ceramic piezo electric transducers (pictured below) epoxied to its tank's underside. They use around 40W of power each.
Newer ultrasonic cleaners, ...
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Noise in Voltage Buffer
I am trying to build a voltage buffer for a piezoelectric record player cartridge. The amp built into the record player doesn't provide the necessary impedance. I have tried multiple circuits ...
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1answer
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Amplifier circuit for Bently Nevada velomitor 330525
I'm in need of measuring vibrations and I have access to these Bently Nevada velomitors.
I'm not sure how to design a ampliefier circuit for the signal.
The datasheet is says that it is a piezo ...
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67 views
LTSpice sweep resistance
I would like to plot the power obtained by this simple recovery circuit (UR1eff^2/R1) according to the value of the resistance R1. But as it is a sinusoidal function, it takes the average value of the ...
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SSHI circuit on LTSpice
I've been trying to get an SSHI circuit running on LTspice for several days now (see below schematic). My problem is the following: the simulation (.tran) stops after a hundred milliseconds. Being a ...
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Turning on a latch circuit with a piezo sensor?
I am trying to build a relatively 'simple' circuit with a piezo sensor that turns on an LED for ~10-20 seconds after it has been tapped.
In the off-state the circuit should use zero current to ...
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2answers
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Piezo signal amplifier using LM358 opamp
I was trying to amplify the signal of a piezo, which is very low and amplify it so that I could use it to latch a flipflop. I had the LM358 opamp so I made a differential amplifier by a gain of 50 so ...
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protect op amp input from overvoltage from piezo sensor
I use a piezo to register the moment of a knock via a micro controller's analog in (1.8V Max)
So far I used the scheme in the figure without any diodes. This works so far, but depending on the knocks ...
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Piezo cantilever energy harvester: how to mesure such small power?
I am currently designing a piezo energy harvester and I would like to modify the resonating frequency to maximize the energy recovered(for exemple by changing the center of mass of the cantilever). My ...
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Protecting circuit from piezoelectric disc voltage spike
I have a piezoelectric disc, and I'm trying to use to build a primitive sonar. I connected the disc to an oscilloscope and if I press very hard on the disc, I see that the voltage can spike pretty ...
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160 views
Stick-Slip Piezo Linear Stage Driver - Prevent the Load from Changing Driver Output?
I am currently trying to develop a circuit that generates ramp waveforms to control the motion of a piezo linear stage.
Specifically, two waveforms need to be possible to output: a slow ~250us upward ...
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1answer
120 views
Does the type of preamplifier used for a piezoelectric sensor change its physical resonant frequency?
Two common amplifier circuits used for piezoelectric sensors are voltage amplifiers and charge amplifiers (pictured respectively).
With the charge amplifier, the sensor is shorted but this is not the ...
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536 views
Is this design of a charge amplifier for a piezoelectric sensor correct?
This is the specifications that must be met: "Design a charge amplifier for a piezoelectric sensor that has 500 pF capacitance. It should pass frequencies from 0.05 to 100 Hz so that it can ...
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Debugging a SA 90.4 800W class-D audio amplifier
I am using a Re-audio SA 90.4 800W 4-channel class D audio amplifier (https://www.amazon.com/REAudio-SA90-4-4-Channel-Digital-Amplifier/dp/B00RE9EO7K) for some underwater piezoacoustics experiment. ...
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2answers
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Why do magnet door/window alarms use always-on switches?
I am looking at door/window alarm designs, and they all use overcomplicated circuits with an always on switch, where the piezo is triggered when the switch is off.
If the switch was always off, it ...
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1answer
207 views
6-channel piezo buffer jfet circuit
Even though I'm a total beginner at electronics, I've decided to build a 6-channel piezo pickup buffer/mixer unit, for a stringed instrument. It should fit into a typically sized electronics cavity, ...
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How to DRIVE a piezo driver circuit
I want to implement a driver circuit for piezo actuators for a positioning system. For this, I require a high-voltage, low-current output, similar to the one discussed here which features a circuit ...
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Driving piezo scanner tubes using the driven internal electrode configuration
I'm planning on doing a project involving a piezo tube scanner (PTS). The PTS will be used for 3 axis manipulation of a sharp needle. PiezoDrive has a few scanners and some info on how to use them. ...
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356 views
Protect Op Amp input from piezo sensor overvoltage
I have a circuit that I'm using to detects "knocks" using a piezo element. It seems to work adequately, but as I half suspected, I have now demonstrated that it's possible for the piezo element to ...
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121 views
Is it possible to drive a power piezoelectric in lower frequency than its own frequency?
I am driving a piezo transducer simply by an inductor series with piezo.
the resonant frequency of the piezo is about 40KHz and I designed a 20KHz transducer.
I'm giving a pulse voltage (using a class ...
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273 views
What happens when DC is applied to a piezo crystal?
I've heard that when an alternating current is passed through a piezo crystal it vibrates. But what happens if a direct current is passed through the crystal? I'm assuming depending on the direction ...
