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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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,...
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1answer
192 views

Why is my piezo so innacurate? Is it just insensitive? [closed]

I'm trying to make a sound level display, simply to tell the user how loud nearby sounds are. The issue is this data, which I collected in a near silent environment (it's night, and I can't make out ...
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1answer
159 views

Send action signal via radio using energy generated by piezo

I have an idea going on in my mind but I am not sure if it is even feasible, so please be patient! Here is my problem. I have a set of chairs, say several dozens. I would like to be able to monitor ...
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1answer
123 views

Conditioning input signal range for sensor

I have piezo sensor which outputs around 1mV of signal. I am using an already build analog front end to measure the signal, with Vcc = 5V and Vss = 0V. To measure the signal, the front end has ...
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2answers
321 views

Using a low voltage opamp for feedback with high voltage mosfet?

I've been looking at Piezo drivers lately. They are effectively 0->100v output amplifiers with 0->10v input. Which can source ~60mA, at a few KHz. The drivers I've seen mostly use high voltage opamps ...
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207 views

Stop earth from introducing noise to piezo circuit

I am currently prototyping a circuit which measures pulses on piezo-electric sensors; however, I seem to be having an issue with noise. When the circuit is battery powered (and therefore floating), ...
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3answers
2k views

Converting small AC output voltage of a piezo element to DC without IC

I've been trying to find a AC to DC converting circuit that will take a piezoelectric crystal as its input. I have the piezo to a bridge rectifier but all the diagrams I am finding have some kind of ...
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2answers
2k views

5v piezo (micropump) with arduino

edit -added pin 9 as output in setup and now HIGH/LOW code works. -When the pump is set to LOW it turns on, when it goes HIGH it is disabled. So when I plug the arduino in, by default the pump turns ...
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1answer
777 views

How to power a 6-12v Piezo siren from an Arduino?

We are trying to power a Piezo siren, which requires 6-12v, from an Arduino, which only outputs up to 5v. We are planning on using an external 9v battery to power the Piezo siren, although we do not ...
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1answer
299 views

Setting up piezo pump with arduino

I'm trying to control a 12V piezo pump (with an inbuilt driver) and I'm a bit unsure how to use it safely. I'm using an Arduino Uno to control it, with an N-channel MOSFET rated at 60V 30A (with a 10K ...
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1answer
3k views

Loudest Piezo with low voltage and current?

I am making a board which will communicate wirelessly with a smart phone. When I send a specific command, I want it to sound an alarm to the user, making it able to be found when lost. I've got ...
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1answer
91 views

Replacing a Piezo with a button

In my senior engineering design class for high school, my teacher bought a toaster oven and microcontroller and tasked my group to make surface mount digital dice kit for him to teach surface mount ...
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1answer
3k views

Using an unamplified piezo in a mic-in jack

it's my first time working with piezos and I'd like to use one as an input to my iPhone via the microphone port to allow my app to detect vibrations. in order to do this, I was thinking that I'd use ...
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220 views

DC-DC converter topology

Is it possible to build a DC-DC converter by means of a piezo crystal followed by a voltage multiplier? The crystal would supply the AC voltage needed by the voltage multiplier. I'm looking to get ...
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3answers
849 views

Avoiding switching transient in IC switch

I am switching an op amp input between two sources, one is ground, the other is a piezo material. I have an issue with switching transients which cause the op amp to saturate since I have a pretty ...
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2answers
2k views

DC - DC Amplifier for Piezo Buzzer

I have a Raspberry Pi outputting a 3.3v DC square wave that I'd like to be able to amplify to just under 20v, the maximum the piezo can handle. Just to clarify, the piezo does not have an internal ...
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2answers
1k views

If I drive a piezo sensor with switched DC, will I get back over-voltage?

I have a built a vibration detection circuit based on an op-amp to trigger high speed photography of balloons popping. (I'm using this circuit) (From this blog - not my image) It works well. It ...
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1answer
1k views

Piezo electric transducer-Vibration to Electrical Energy

I need to convert Vibrations into electricl enerery. Is it possible to convert it with the use of single chips?
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2answers
4k views

How to improve the sensitivity of a piezo assembly?

First and foremost I’d like to warn you that I’m not a native English speaker. Sorry in advance for my mistakes. And also I’m kinda a newbie in terms of electronics; so go easy on me please, I will ...
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1answer
676 views

What is the pressure/force sensor used in the Beddit?

The Beddit sleep-tracking device (Beddit and @indiegogo) has a pressure sensor that looks like a thin (~0.3mm?), flexible tape about 2ft long. The tape seems to be constructed of several layers ...
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2answers
396 views

I'm trying to set up a electrical polling field that produces 2000 V/mm inside a kiln

I'm attempting to produce my own piezoelectric ceramic materials. I wish to manufacture half dollar size x 1/4" thick ceramics which are kiln fired at just under 1020 degrees Fahrenheit while ...
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2answers
961 views

Differential Driver Maximum Output Voltage Swing

I'm trying to understand how BTL driver on TI's DRV8662 Piezo Haptic Driver (datasheet) works. What I am confused about is how a 200Vpp output signal can be generated from a driver that only has rails ...
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3answers
67 views

Is the battery being drained?

I'm building a simple intrusion alarm system with a piezo buzzer fed by a 9V battery, I have a switch to activate/deactivate the alarm, and a trigger (like a switch) connected to a tripwire so if ...
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2answers
1k views

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 ...
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1answer
186 views

Synchronising two microcontrollers for LED sequence and piezo speaker

I am making a piano keyboard which has a subsystem that plays a song whilst lighting up the corresponding notes that are to be played. I have used a PICAXE 20M2 microcontroller for the LED sequence ...
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1answer
2k views

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 ...
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1answer
2k views

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 ...
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1answer
956 views

Amplified 80dBA 40KHz Sound From 3V Square Wave?

How can a loud high-frequency tone be produced from a 3V square wave? Given that: the square wave is 3V and can have a varying frequency (max 4mA) 12VDC high-current supply is available ...
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1answer
2k views

Amplifying a Piezo with an Op-Amp

I am trying to use a piezo as a speaker. (I know that a piezo has a bad frequency-response. However, In my application it is better to use one instead of a speaker, since normal speakers don't like ...
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1answer
1k views

Amplifying an audio signal [closed]

Preface Essentially, I want to use the analog signal coming out of my smartphone when I play music to modulate LEDs and piezo electric elements. Initially, I thought that if the raw power output is ...

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