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Piezoelectric Circuits
#'s - M      N - Z

Last Updated: October 09, 2017 03:39 PM

Circuits Designed by Dave Johnson, P.E. :

3v Powered Loud Beeper - Getting a high sound intensity from a piezoelectric type beeper is not easy when the available DC supply is only 3v.    The circuit below is not only efficient but produces a very intense sound.    The circuit combines a voltage boost section with a resonant. . . Circuit by Dave Johnson P.E.-February, 2009

Alarm-Piezo Device Detects Motion - Using a piezo device, this circuit will activate a beeper whenever the circuit is moved.  It could be used as an earthquake alarm. . . Circuit by Dave Johnson P.E.-July, 2006

Beeper that is Very Loud - This circuit generates a continuous tone instead of a pulsing one.  The circuit delivers about 110db   (12 inches away) from a 9v battery using a single inexpensive C-MOS IC.  An off-the-shelf piezoelectric beeping device is driven at resonance to insure maxim. . . Circuit by Dave Johnson P.E.-June, 2000

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. . . Circuit by David A. Johnson P.E.-January, 2009

Finger Tap Piezo Relay - This circuit uses a flat piezo wafer, glued inside a plastic box, as a finger tap sensor.  With each tap of a finger to the box holding the wafer, the circuit turns on and off AC or DC power to an external device.  The circuit is powered by a 9v 9v battery . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2010

High Sound Output Beeper - I you need a real loud beeper, this circuit delivers about 110db (12 inches away) from a 9v battery using a single inexpensive C-MOS IC.  An off-the-shelf piezoelectric beeping device is driven at resonance to insure maximum efficiency.  By changing the control IC to a 74AC14, the same circuit can operate from 3v and 1.5v batteries. . . Circuit by David Johnson P.E.-June, 2000

Hour Meter triggered by Machine Vibration - This hobby circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine . . . Hobby Circuit designed by David A. Johnson P.E.-January, 1998

Improved Solar Path Light - The circuit below was designed to replace the guts of an existing path light assembly with one which has a much better performance.  I suggest using a quality 10 cell solar panel with at least a 4 square inch area.  Buy a panel with solar panels that fills . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2011

Machine Vibration Triggers Hour Meter - This circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine.  Machine vibrations are detected by an off-the-shelf piezo. . . Circuit by David A. Johnson P.E.-January, 1998

Motion Alarm using piezo Device - An inexpensive piezoelectric device is used as a motion sensing device for this motion alarm. . . Circuit by David A. Johnson P.E.-July, 2006

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

3v Powered Loud Beeper-  Getting a high sound intensity from a piezoelectric type beeper is not easy when the available DC supply is only 3v.  The circuit below is not only efficient but produces a very intense sound.  The circuit combines a voltage boost section with a resonant. . . Circuit by Dave Johnson P.E.-February, 2009

3V supply Delivers 12V p-p to piezo speaker-  10/16/03  EDN Design Ideas:  Low-profile piezoelectric speakers can provide quality sound for portable electronic devices, but they require voltage swings greater than 8V p-p across the speaker element.  Yet, most portable devices include only a low-voltage pow __ Circuit Design 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 __ Designed by Tony van Roon  VA3AVR

Alarm-Piezo Device Detects Motion-  Using a piezo device, this circuit will activate a beeper whenever the circuit is moved.  It could be used as an earthquake alarm. . . Circuit by Dave Johnson P.E.-July, 2006

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-temperature coefficient characteristics of their quartz counterparts.  However, you. PDF has several circuits, scroll to find this one. __ Circuit Design by Jim Mahoney, Linear Technology Corp, Milpitas, CA

AT-121 (3W) to AT-150 (2W) Converter-  AT-121 3-wire to 2-wire Piezo Buzzer Converter, AT-150. __ Designed by Tony van Roon  VA3AVR

Beeper that is Very Loud-  This circuit generates a continuous tone instead of a pulsing one.  The circuit delivers about 110db ( 12 inches away) from a 9v battery using a single inexpensive C-MOS IC.  An off-the-shelf piezoelectric beeping device is driven at resonance to insure maxim. . . Circuit by Dave Johnson P.E.-June, 2000

Boost Voltage to Piezoelectric Transducers-  06/09/11  EDN Design Ideas:  Drive a piezo device at maximum power and its resonant frequency.  Piezoelectric transducers are common in ultrasonic and acoustic-alarm-signaling applications.  To get enough acoustic power from a piezoelectric transducer, you must power the device with a frequency at or near its resonant frequency.  Furthermore, the driving voltage should be as high as the transducer allows. __ Circuit Design by Kurt Nell, Sankt Pölten, Austria

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. . . Circuit by David A. Johnson P.E.-January, 2009

Controller provides multiple alarm-driver formats-  01/15/98 EDN Design Ideas:  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 provide as multiple driver formats with a minimum of additional cost and footprint __ Circuit Design by William Grill, Riverhead Systems, Littleton, CO

Current-mode instrumentation Amplifier enhances piezoelectric accelerometer-  11/23/06 EDN Design Ideas:  Circuit suppresses capacitively coupled noise pickup by piezoelectric sensor and its wiring __ Circuit Design by Dave Wuchinich, Modal Mechanics, Yonkers, NY

Deer Repellent-  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 __ Contact:  Charles Wenzel of Wenzel Associates, Inc.

Finger Tap Piezo Relay-  This circuit uses a flat piezo wafer, glued inside a plastic box, as a finger tap sensor.  With each tap of a finger to the box holding the wafer, the circuit turns on and off AC or DC power to an external device.  The circuit is powered by a 9v battery . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2010

Harvest Energy using a Piezoelectric Buzzer-  03/20/08  EDN Design Ideas:  You can harvest small amounts of mechanical energy using a piezoelectric buzzer to charge a supercapacitor __ Circuit Design by Carlos Cossio, Santander, Spain

High Sound Output Beeper-  I you need a real loud beeper, this circuit delivers about 110db ( 12 inches away) from a 9v battery using a single inexpensive C-MOS IC.  An off-the-shelf piezoelectric beeping device is driven at resonance to insure maximum efficiency.  By changing the control IC to a 74AC14, the same circuit can operate from 3v and 1.5v batteries. . . Circuit by David Johnson P.E.-June, 2000

High-voltage Amplifier drives piezo tubes-  7-Dec-04 EDN Design Ideas:  Piezoelectric tubular positioners that drive manipulators in scanning tunneling microscopes require high-voltage, low-current drive circuits.  The circuit in Figure 1 can drive high-resistance, low-capacitance piezoelectric loads at a -3-dB bandwidth of 6 kHz.  It offers a low-cost alternative to commercial drivers.  PDF has several circuits, please scroll to find this one __ Circuit Design by Bipin Duggal, Netaji Subhas Institute of Technology, New Delhi, India

History of Piezoelectricity-  19-Feb-09 EDN Design Ideas:  A voltage-to-frequency converter uses square roots to extend dynamic range by orders of magnitude__

Hour Meter triggered by Machine Vibration-  This hobby circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine . . . Hobby Circuit designed by David A. Johnson P.E.-January, 1998

Improved Solar Path Light-  The circuit below was designed to replace the guts of an existing path light assembly with one which has a much better performance.  I suggest using a quality 10 cell solar panel with at least a 4 square inch area.  Buy a panel with solar panels that fills . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2011

Keys Finder-  The ear and mouth of the circuit is a piezoelectric buzzer.  Fizzling in a frequency of 34 KHz produced sound waves that piezoelectric buzzer converts them to an oscillation.  This oscillation passes thought C1 and thought inverters N1N3.  The inverters along with R1 and R2, compose an amplifier with gain 400 !.  The C8 and C9 stabilize and reduce the signal's level. __

Knock Alarm-  This circuit ( Fig.  1) , used in conjunction with a thin piezoelectric plate, senses the vibration generated on knocking a surface ( such as a door or a table) to activate the alarm.  It...__ Electronics Projects for You

Knock Alarm-  This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; e.g., a door or table.  Basically, it amplifies and processes the signal from the sensor and sounds an alarm for a preset period.  In operation, the piezoelectric sensor converts mechanical vibration into an electrical signal.  This sensor can be attached to a door, a cash box, cupboard, etc using adhesive. __ Raj. K. Gorkhali  c Silicon Chip Electronics

Machine Vibration Triggers Hour Meter-  This circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine.  Machine vibrations are detected by an off-the-shelf piezo. . . Circuit by David A. Johnson P.E.-January, 1998

Microcontroller Drives Piezoelectric Buzzer At High Voltage-  03/01/12  EDN Design Ideas:  Drive the buzzer directly from the μC’s I/O pins.  Piezoelectric buzzers find wide use in embedded systems for audible-signal generation.  You can drive a piezoelectric element directly from a microcontroller’s I/O pins, but the maximum voltage rating and loudness of a piezoelectric buzzer are typically several times larger than the voltage an I/O pin supplies.  Using four enhancement-mode MOSFETs that connect in an H-bridge configuration, the microcontroller can drive the buzzer at a high alternating voltage.  The gate terminals of the N-channel transistors in the lower arms of the bridge can connect directly to the microcontroller’s I/O pins.  The voltage level on the I/O pins is insufficient for switching the P-channel transistors, however. __ Circuit Design by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey

Microcontroller Drives Piezoelectric Buzzer At High Voltage through One Pin-  08/17/12  EDN Design Ideas:  If you're short on I/O pins, this circuit might solve your problem. __ Circuit Design by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey

Motion Alarm using piezo Device-  An inexpensive piezoelectric device is used as a motion sensing device for this motion alarm. . . Circuit by David A. Johnson P.E.-July, 2006


Piezo Circuits:   #'s - M      N - Z

 


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