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Piezoelectric Circuits
#'s - M      N - Z

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

Piezoelectric 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 David Johnson P.E.-June, 2000

Piezoelectric Device used for Motion Alarm - An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Piezoelectric Tap Switch - 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. . . Circuit by Dave Johnson P.E.-December, 2010

Piezoelectric Triggered Switch - Two different switch circuits are shown.  One sources current and the second sinks current.  Both switches are connected to a piezo wafer.  When the wafer is tapped, the switches are activated. . . Circuit by Dave Johnson P.E.-February, 2002

Piezoelectric Vibration Sensor Activates Switch - An inexpensive piezo device is used as a motion sensing device for this motion alarm. . . Circuit by David A. Johnson P.E.-July, 2006

Piezoelectric Water Flowing Indicator - The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezo wafer.  The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra low power voltage comparator . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

Solar Path Light Improvement - Use 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. . . Circuit by Dave Johnson P.E.-March, 2011

Sound Generator-Clicking - 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 . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2009

Still 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 piezo device to more than 200 volts peak to peak . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Switch activated by Piezo Vibration - An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Tap Switch uses a Piezo Wafer - Two different switch circuits are shown.  One sources current and the second sinks current.  Both switches are connected to a piezo wafer.  When the wafer is tapped, the switches are activated . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Three-Volt Powered Very 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 . . . Hobby Circuit designed by David Johnson P.E.-February, 2009

Ultra Low Current 3v LED Flasher #8 - This circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from National Semiconductor and a super efficient green LED from King Bright.  The 3v powered circuit forms a classic pulse generator circuit, which drives the LED.  The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED current is only 100ua. . . Circuit by Dave Johnson P.E.-February, 2011

Very Loud 3v Powered 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 David Johnson P.E.-February, 2009

Very Loud Beeper Circuit - This circuit generates a continuous tone instead of a pulsing one for your hobby project.  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 . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Very Loud Pulsating Beeper - Many battery powered alarms draw excessive current when operating.  Some of the most attention-getting noise makers, such as the unit shown below, use piezo sound generators with a frequency sweeping tone.  When operating with a 9v battery, these units can often draw 100ma or more.  In many applications, a continuous alarm sound is not needed. . . Circuit by Dave Johnson P.E.-October, 2010

Water Flowing in Pipe Indicator - The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezoelectric wafer.    The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra low power voltage comparator.     When the vibration signal has sufficient amplitude, a FET transistor switch is activated…[Circuit designed by Dave Johnson P.  E.  , 6/06/2009]. . . Circuit by David A. Johnson P.E.-July, 2009


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

Piezo crystal Monitors liquid level-  03/30/00 EDN Design Ideas:  The simple and inexpensive circuit in Figure 1 monitors the liquid level in a container.  The piezo crystal, carefully mounted at the bottom surface of the container, receives it activation from the 74HCT14 hex Schmitt trigger.  The. PDF contains multiple circuits, please scroll to find this one __ Circuit Design by J Jayapandian, IGCAR, Tamil Nadu, India

Piezo Device generates buzz, beep, or chime-  05/07/98 EDN Design Ideas:    NOTE:     Page includes several designs, scroll to find this one. Piezoelectric buzzers, such as the Murata (Smyrna, GA]PKB5-3A in Figure 1, make excellent alarms.  They're compact, lightweight, efficient, and reliable.  However, a piezo alarm is a dc device; it requires additional circuitry to operate from an ac source __ Circuit Design by Dennis Eichenberg, Parma Heights, OH

Piezo Film Sensor Serves as an Accelerometer-  Accelerometers are used in instrumentation applications to measure a change in velocity with respect to time or an inclination (the angle between an object’s vertical axis and a line perpendicular to a plane tangent to the earth’s__

Piezoelectric 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 David Johnson P.E.-June, 2000

Piezoelectric Device used for Motion Alarm-  An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Piezoelectric Driver Finds Buzzer’s Resonant Frequency-  7-Aug-08 EDN Design Ideas:  By driving a piezoelectric buzzer near its resonant frequency and counting the residual oscillations, a microcontroller can find the buzzer's resonant frequency __ Circuit Design by Mehmet Efe Ozbek, PhD, Atilim University, Incek, Ankara, Turkey

Piezoelectric Energy Harvester & 1.2V Secondary Rail-  The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation.  The EN pin can be used to activate the LTC3388-1/LTC3388-3.  For instance, in this circuit the __ Linear Technology/Analog Devices App Note, Jul 23, 2010

Piezoelectric Heat Sensor-  Here is an Ultrasensitive Heat Sensor to monitor high temperature in Electronic devices.  It can be placed inside the electronic gadget that usually generates heat during its operation.  The circuit also functions as a sensitive Fire Alarm.  This heat sensor uses the piezoelectric property to sense heat.  The sensor element is the __ Designed by D Mohan Kumar

Piezoelectric Shock Sensor Amplifier-  A piezoelectric shock sensor generates a charge when physically accelerated.  This charge is transferred to the smaller feedback capacitor.  In this circuit a gain of 100 is given to the sensor’s open circuit voltage. __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Piezoelectric Tap Switch-  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. . . Circuit by Dave Johnson P.E.-December, 2010

Piezoelectric Tone Generation using the MAXQ3210-  App Note 4148-- 2/04/2008 -- (add 5/08) __ Maxim Integrated

Piezoelectric transformer-  If there is a need to feed very low power devices you may resort to infrared optocouplers, solar cells, batteries or low power transformers although the latter might be rather oversized for the intended purpose.  Eventually, with the exception of solar cells, all__

Piezoelectric Triggered Switch-  Two different switch circuits are shown.  One sources current and the second sinks current.  Both switches are connected to a piezo wafer.  When the wafer is tapped, the switches are activated. . . Circuit by Dave Johnson P.E.-February, 2002

Piezoelectric Vibration Sensor Activates Switch-  An inexpensive piezo device is used as a motion sensing device for this motion alarm. . . Circuit by David A. Johnson P.E.-July, 2006

Piezoelectric Water Flowing Indicator-  The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezo wafer.  The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra-low power voltage comparator . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

Point-contact oscillators-  The principle of operation of a car hooter has been applied to both a ceramic sounder and a loudspeaker.  A break in the supply current is caused by the vibration of the ceramic sounder plate or the speaker membrane.  You could implement similar circuits even without a transformer but the voltage range will be limited, there__

Remote Switch Uses No-Power Fiber-Optic Link-  10/10/96 EDN Design Ideas:  The heavy-duty switching device in Figure 1 counts the number of products manufactured and rolled out of a production line per hour.  The switch is useful for counting rolling heavy objects or materials weighing one to several thousand kilograms.  It generates one pulse per __ Circuit Design by Shyam Tiwari, IGKAR, Kalpakkam, India

Seismic Sensor-  My original "Deer Repellent/ Seismic Sensor" recommended using a speaker with a weight glued to the cone as a vibration sensor ( see bottom of page) but it recently occurred to me that the speaker could supply the mass itself.  By gluing __ Contact:  Charles Wenzel of Wenzel Associates, Inc.

Shock-Sensor Prevents Data Corruption-  07/04/96 EDN Design Ideas: Hard-disk drives for laptop and other portable applications need to withstand significant g-force shocks when operating.  A typical 1.8-in.  drive writes servo information over less than 15% of the disk's active area, which means that the read/write head spends more than 85% __ Circuit Design by Carolyn Platt, Raltron Electronics Corp, Miami, FL

Solar Path Light Improvement-  Use 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. . . Circuit by Dave Johnson P.E.-March, 2011

Sound Generator-Clicking-  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 . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2009

Still 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 piezo device to more than 200 volts peak to peak . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Switch activated by Piezo Vibration-  An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Tap Switch uses a Piezo Wafer-  Two different switch circuits are shown.  One sources current and the second sinks current.  Both switches are connected to a piezo wafer.  When the wafer is tapped, the switches are activated . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Three Fake Alarms-  Battery Powered LED Circuits:  Flashing LEDs can be used to create the impression that an alarm has been fitted.  Or they can be used in conjunction with a real alarm - to warn-off a potential thief.  These three small circuits will flash anything from a single LED - up to 90 LEDs and beyond - with a variety of speeds and patterns. __ Designed by Ron J.

Three-V 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

Three-Volt Powered Very 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 . . . Hobby Circuit designed by David Johnson P.E.-February, 2009

Ultra-Low Current 3v LED Flasher #8-  This circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from National Semiconductor and a super-efficient green LED from King Bright.  The 3v powered circuit forms a classic pulse generator circuit, which drives the LED.  The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED current is only 100ua. . . Circuit by Dave Johnson P.E.-February, 2011

Very Loud 3v Powered 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 David Johnson P.E.-February, 2009

Very Loud Beeper Circuit-  This circuit generates a continuous tone instead of a pulsing one for your hobby project.  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 . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Very Loud Pulsating Beeper-  Many battery powered alarms draw excessive current when operating.  Some of the most attention-getting noise makers, such as the unit shown below, use piezo sound generators with a frequency sweeping tone.  When operating with a 9v battery, these units can often draw 100ma or more.  In many applications, a continuous alarm sound is not needed. . . Circuit by Dave Johnson P.E.-October, 2010

Water & vandal-proof keypad uses piezoelectric disc as sensor & buzzer-  04/21/14  EDN Design Ideas:  An ingenious and low-cost method to create a rugged “UI”.  This design was done to get a sealed keypad for very wet environments (in my particular case, showers for swimming pools).  The keypad needed to be able to detect slight pressure on a stainless steel plate 0.4mm thick.  Apart from water protection, the solution offers an esthetical finish, as the user side is absolutely flat, with nothing visible other than the silkscreened print.  Another advantage of this type of keypad is that it is vandal-proof __ Circuit Design by Francesc Casanellas

Water Flowing in Pipe Indicator-  The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezoelectric wafer.  The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra-low power voltage comparator.   When the vibration signal has sufficient amplitude, a FET transistor switch is activated…[Circuit designed by Dave Johnson P.  E.  , 6/06/2009]. . . Circuit by David A. Johnson P.E.-July, 2009

White LED Shines From Piezoelectric-Oscillator Supply-  10-Jan-08 EDN Design Ideas:  A piezoelectric ceramic buzzer powers a white LED from a single cell __ Circuit Design by TA Babu, Chennai, India

 

Piezo Circuits#'s - M      N - Z

 


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