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Piezoelectric Circuits Page 1
#'s - D E - M
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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| Circuits
Designed by Dave Johnson, P.E. : |
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Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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) |
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Driving Piezoelectric Actuators Apex-AN44 - Apex App Note....
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| Piezoelectric
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