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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3answers
3k views

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 ...
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2answers
189 views

Using piezoelectronic components as position trackers

I've been trying for a while to get this circuit working, I looked all over the place and now, defeteated, I come to the point where I need to ask for help with my specific case. My plan was to use ...
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156 views

ADC for many piezos at once

I'm building an electronic musical instrument, using piezoelectric contact microphones as inputs. I want ~80 buttons, each with a piezo connected to an ADC. The idea is that you hit the piezo, then ...
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1answer
518 views

Piezoelectricity in water mediums

I am trying to run an experiment using a piezo ceramic cylindrical transducer (32X30X10MM 29 KHZ) to send a signal from the inside of a water-filled test metal tube to a transducer mounted on the ...
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1answer
943 views

Piezo input stage for drum triggering

I want to design an input stage for my DIY midi-drum-trigger. Piezo-Elements are used as drum trigger and i want to read out the voltage spikes with the built-in ADC of a ATMega168p in order to ...
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3answers
758 views

Ultrasonic Piezo passive component matching

I am attempting to drive a 640kHz piezo electric transducer with an FPGA. For some reason, I cannot get a matched signal, and do not know why. I've captured a scope readout where CH1 is IN, CH2 is A, ...
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0answers
80 views

Strange output current waveform

I have another question regarding output voltage and current of the driver as continuation of my question @ Inductance overheating Voltage measured on the input of the piezo has a square wave shape on ...
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3answers
1k views

Line In Amplifer to Piezo Help

I am trying to build a very simple amplifier type device to power a 4ohm 150 watt piezo tweeter. I am getting my signal from an mp3 player and then want to use a voltage source, 9-20 volts, to ...
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1answer
2k views

Filter design for piezoelectric transducer

I'd like to use a piezoelectric transducer at one of its resonant frequency (4500 Hz). In order to get a clearer signal, I would like to use a band-pass filter. First of all I calculated the ...
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1answer
268 views

60Hz hum with piezo disc

I am trying to measure the "at rest" characteristics of a piezo disc. The piezo is of inexpensive variety, the type enclosed in a black plastic holder: http://www.sunrom.com/img/p/83/83_0_800.jpg ...
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1answer
243 views

ADC0820 and piezo drum pad

Bit of a newb with electronics, so if this question has an obvious answer, please excuse me. I am trying to attach an electronic drum pad to the Vin input of an ADC0820 flash ADC. I am powering it ...
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1answer
310 views

Unwanted noise in oscilloscope display

Hi I'm a beginner on using an oscilloscope and I'm sorry if my question may be repeated in other posts. I was working on a circuit with the following materials: (1) an Al plate (5mm thick) (2) a ...
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2answers
2k views

What will increase output volume (dB) on a Piezo Transducer?

I need to achieve 110dB at 25khz from a Piezo Transducer. According to the datasheet, the resonant frequency of the Piezo is 25khz and at 10 vrms it will produce 110dB. I will be using an ...
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1answer
526 views

Powering a self-drive piezo buzzer with capacitors?

I have a project I am working on where I want to power a "self-drive" piezo buzzer for 20-30 seconds. However, in order to provide the power to this piezo, I would like to ideally use capacitors in ...
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2answers
520 views

What is the characteristic of piezo transducer?

I want to detect the tap/sound, I am using piezo transducer (circular) and connected it to raspberry pi using ADC (MCP3008, SPI communication). When I tap on the transducer the output value should ...
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1answer
535 views

Design of variable split rail power supply

I'm attempting to drive an array of piezo transducers and am struggling to find a good design capable of driving from around +-5V to +-30V at about 2A for my testing. There are about 12 sets of ...
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1answer
2k views

What are typical failure modes of piezoelectric transducers?

How do piezoelectric transducers in ultrasound probes fail? I have a machine whose elements are being driven by an amplifier that is very noisy. The signal I see arriving from the power amplifier ...
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4answers
15k views

How to determine the polarity of a piezoelectric buzzer?

Inside of a piezo buzzer is a little unimorph/bimorph disk which converts voltage to mechanical movement. To function as a buzzer, you just feed it an ac signal at its resonant frequency. However, ...
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1answer
4k views

This guitar piezo opamp buffer lacks any sort of bass, why?

My preamp in my acoustic guitar died after I put the battery in backwards. I need to replace it, and fast. Piezos have incredibly high output impedance (5+ mohm) so a buffer circuit is used to knock ...
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2answers
1k views

LM317 - Getting the lowest possible Vout

The LM317 can produce a Vout from 1.25V to 37V. I have a small piezo pickup I'd like to step down to as close to 1V as possible. The formula for the LM317 is roughly Vout = 1.25(1 + R2/R1). Can I just ...
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1answer
2k views

Driver for piezo atomizer/transducer

I am trying to drive a "piezo atomizer" which is pretty much a transducer from what I can see. The specs on the transducer are as follows: -30-50VPP -Resonant frequency fr: 190 KHz±5KHz -Resonant ...
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1answer
54 views

Paralling piezo alarms

I have a simple question and I'm new to electronics but I don't know the answer so here goes! I have a house alarm with a loud piezo sounder. The alarm has only one output connector. Is it possible ...
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1answer
65k views

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 ...
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2answers
879 views

op amp with single supply - non inverting circuit gain not being produced

I'm trying to boost a 12V signal to around 100-120V using an opamp from a single 12V 5A supply voltage (gain of about 10). I can't seem to get it to work though. Right now I'm just trying to make a ...
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1answer
3k views

How to add a capacitor and switch correctly to piezoelectric circuit?

Am a hobbyist beginner with no prior electrical engineering knowledge (though can follow a basic circuit), so please bear that in mind when giving your valued advice! am following an instructable to ...
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372 views

Piezo film for electronic stethoscope

I'm needing to build an electronic stethoscope. I'm thinking to use this piezo film because I already used a piezo disc (ceramic piezo element I suppose) 25mm large (no idea which producer, eBay ...
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0answers
494 views

Piezo speaker driver not giving full differential voltage - why?

I am trying to drive a piezo speaker at 20kHz with maximum voltage swing from a 10V source. Previously I had used a square wave plus its inverse to give the equivalent of 20V across the speaker but I ...
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1answer
6k views

Arduino piezo vibration measurement circuit

I'm looking for a very simple measurement circuit to measure vibrations with a piezo elment and an arduino device. I want to read positive and negative values. I have this sensor: http://www....
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1answer
1k views

Piezo vibration sensor board negative values

I have this piezo vibration sensor module from Grove: http://www.seeedstudio.com/wiki/Grove_-_Piezo_Vibration_Sensor Using this sensor and an arduino device I want to measure two things: amplitude (...
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2answers
660 views

make a buffer balanced

i am still new to electronic and i probably have a stupid question.. i am trying to build a buffer for a piezo microphone following the project on this site: http://www.scotthelmke.com/Mint-box-...
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5k views

Buzzer vs piezo sound for generating sound

Correct me if i'm wrong. Buzzers can only produce 1 tone but are quite loud. While piezos can generate a wide variety but are most suited to ics. Is there anything i missed?
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1answer
171 views

Explain this schematic

I am taking apart this non-invasive blood pressure monitor to see how it works. The engineer decided to use (what looks like a piezo-electric element to measure the relative pressure from the cuff, ...
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2answers
896 views

Parallel Piezo Pickup Problem

I've an electronic drum machine - which involves electronic drum pads with piezoelectric transducers in them (which pick up you hitting the pads with your drum sticks) which feed into a magic drum ...
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1answer
443 views

Driving Ultrasonic Transducer

Because my system needs higher power for the ultrasonic transducer, I need to drive the transducer with higher voltage. I came up with following ideas driving transducer with 10V peak to peak voltage....
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1answer
466 views

Series inductance increasing piezo volume

Does an inductor in series with a piezo element increase its volume? If so, is it because of collapsing magnetic fields?
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230 views

Using an mbed and piezo disc to determine frequency

I am attempting to determine the frequency of an instrument from its vibration using a piezo disc and an mbed LCP1768. I attempted this with a raspberry pi but couldn't get the sample frequency high ...
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1answer
731 views

Fluctuating op-amp output

I've presented this schematic before in bits and broken pieces but I finished it, but I'm still not getting the results I want and expect. simulate this circuit – Schematic created using ...
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2answers
293 views

Piezo to detect low frequency, low strain

I have been trying to detect a very low frequency, very low strain signal with different types of piezos (hobby type, hobby type enclosed in plastic casing, shielded contact mic type, and flexible ...
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1answer
202 views

Help correcting a circuit piezo ADC

I've been trying to develop an electric guitar tuner using a piezo disk to detect vibration. I have this design but at the moment the design fluctuates randomly from 0 to 5.09V when it should remain ...
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2answers
168 views

Erroneous results from ADC and piezo disk

Okay, so I posted this question before but my design has changed and has become unmanageable. I am attempting to create an electric tuner device which uses a piezo disk to accurately measure the ...
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1answer
215 views

Incorrect voltage readings through ADC

I am trying to create an electric tuner using a piezo (so it can be used to detect vibrations rather than a mic which is subject to ambient noise) I have the schematic below using a voltage regulator ...
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2answers
1k views

Help with resistor in gain and filter op-amps circuit

I'm designing a piezo preamp with high-pass filter using two preamps. The first one amplifies the signal, while the second one filters it (and some little extra gain). See schematic: simulate this ...
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1answer
89 views

piezoelectricity [closed]

By knowing some of the features of piezoelectric sensor, I want to know more about this sensor. how does it actually works? Does it require application of pressure and releasing that pressure often to ...
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1answer
599 views

Negative voltage ADC and op-amp

I have this circuit and I am running code on the raspberry pi which checks the input pin continuously and converts the 10-bit digital signal to a readable voltage. So I can accurately see the voltage ...
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2answers
685 views

Piezo voltage through guitar vibration and Nyquist's theorem

I bought a piezo disk and intend to use it to determine the vibration frequency of a string instrument when a note is played. https://www.sparkfun.com/products/10293 Can anyone explain how much ...
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1answer
2k views

Using a Piezo sensor to detect audio frequency

I recently posted here without much success on this subject but I've moved forward a bit and got stuck, again! I have Raspberry Pi and a MCP3002 ADC chip because RPi doesn't have any analog pins. I ...
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2answers
1k views

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 ...
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2answers
1k views

Piezo into 0-5V ADC, with offset center voltage?

I want my piezos to have a center voltage at 2.5V for a 0-5V ADC input on Atmega328, so it can sense force in both ways - one way would be >2.5V and the other will be <2.5V. Will this circuit work?...
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1answer
3k views

Replacing a 8 ohm Speaker with a Piezo. Will it work?

Like Replacing a piezoelectric speaker with an electromagnetic one, but the other way round. simulate this circuit – Schematic created using CircuitLab A DC squarewave will turn on and off ASW ...
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1answer
165 views

piezo and 3v LED in series to 3v battery

I'm a complete newbie to electronics. This piezo I have works with a 3v battery, and this green 3v LED works with the 3v battery, but when I combine both the piezo and LED in series on the 3V battery,...