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Piezoelectric Circuits  Page 1
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Last Updated on:
Saturday, August 30, 2014 10:28 AM


Circuits Designed by Dave Johnson, P.E. :
  • ANOTHER VERY LOUD PIEZO ALARM BEEPER
    This is yet another beeper circuit that really draws attention. It sweeps the drive frequency slightly to produce a very annoying sound. It uses a transformer to increase the drive voltage across the piezoelectric device to more than 200 volts peak to peak. It cranks out an ear splitting 120db when measured at 12 inches.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

3V supply delivers 12V p-p to piezo speaker -  16-Oct-03 Issue of EDN  Low-profile piezoelectric speakers can provide quality sound for portable electronic devices, but they require voltage swings greater than 8V p-p across... [Design Idea by Royce Higashi and Tony Doy, Maxim Integrated Products, Sunnyvale, CA]
741 Based Light Sensor -  The circuit as shown act as a light sensor. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay.…. [Tony van Roon's circuit]
Amplifier compensates piezoelectric rate gyros -  12/09/99 EDN-Design Ideas....Low-power, low-cost ceramic piezoelectric rate gyros are available,  but they lack the low-temperaturecoefficient characteristics of their quartz counterparts.  However, you….PDF has several circuits, scoll to find this one…. [Design Idea by Jim Mahoney, Linear Technology Corp, Milpitas, CA]
Another Very Loud Piezo Alarm Beeper -  This is yet another beeper circuit that really draws attention. It sweeps the drive frequency slightly to produce a very annoying sound. It uses a transformer to increase the drive voltage across the piezoelectric device to more than 200 volts peak to peak. It cranks out an ear splitting 120db when measured at 12 inches.... [Designed by David A. Johnson]

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AT-121 (3W) to AT-150 (2W) Converter -  AT-121 3-wire to 2-wire Piezo Buzzer Converter, AT-150…. [Tony van Roon's circuit]
Click Sound Generator -  Often in computer controlled systems, you would like to generate a “click” sound whenever a button is pressed. This provides the user with audible feedback that the pushbutton press has been acknowledged.  The two circuits below generate such a sound.  A click sound is generated each time the logic input swings from a logic low to high condition.... [Designed by David A. Johnson]
Controller provides multiple alarm-driver formats  -  15-Jan-98 Issue of EDN  Using a piezoelectric element for alarm applications offers low cost, low power, and flexibility. By coupling this element with a 12C508 programmable controller (Microchip Technology, Chandler, AZ], you can implement an eight-pin alarm generator.  This approach provides multiple driver formats with a minimum of additional cost and footprin.... [Design Idea by William Grill, Riverhead Systems, Littleton, CO]
Current-mode instrumentation amplifier enhances piezoelectric accelerometer -  23-Nov-06 Issue of EDN  Circuit suppresses capacitively coupled noise pickup by piezoelectric sensor and its wiring.... [Design Idea by Dave Wuchinich, Modal Mechanics, Yonkers, NY; Edited by Brad Thompson and Fran Granville]
Deer Repellent (techlib) -  Here is a simple sensor which can detect the seismic vibrations caused by a person or large animal walking nearby. A representative application for the sensor is a deer repellent for the vegetable garden…..(added 02/05)
Driving Piezoelectric Actuators Apex-AN44 -  Apex App Note....

Piezoelectric Circuits :     #'s - D      E - M      N - Z

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