Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

Master Category List - Dave's Circuits

Text & Graphics Copyright © David A. Johnson, PE - ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY to your WEB SITE server!

Piezoelectric Circuits

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.,  02/18/09]


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.,  07/09/06]


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.,  06/03/00]

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.,  01/10/09]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.,  12/07/10]


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.,  06/03/00]


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.,  01/01/98]


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.,  03/13/11]


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.,  01/01/98]


Motion Alarm Using piezo Device  -  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 David A. Johnson P.E.,  07/09/06]


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.,  06/03/00]


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.,  07/09/06]


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.,  12/07/10]


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.,  02/11/02]


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.,  07/09/06]


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.,  07/26/09]


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.,  03/13/11]


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.,  01/10/09]


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.,  06/27/00]


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.,  07/09/06]


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.,  02/11/02]


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.,  02/18/09]


Ultra Low Current 3v LED Flasher #3  -  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.,  02/27/11]


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.,  02/18/09]


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.,  06/03/00]


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.,  10/24/10]


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.,  07/26/09]


More  Piezoelectric Circuits
 

Find Dave's Circuits by Category
eMail David A. Johnson, P.E. about these circuits




HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.