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.... [Design Idea by J
Jayapandian, IGCAR, Tamil Nadu, India] |
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Piezo device generates buzz, beep, or chime - 04/23/98 EDN-Design Ideas
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. The circuits in Figure 1 provide a simple and inexpensive way to
obtain the dc drive. The W04G full-wave bridge rectifie....File contains several
circuits, scroll to this one.... [Design Idea by Dennis Eichenberg, Parma Heights,
OH] |
Piezo Disk - (electronic schematic / circuit added 2/05) |
Piezo Education/Tutorial - PPL stands for 'Phase-Locked Loop' and is
basically a closed loop frequency control system, which functioning is based on
the phase sensitive detection of phase difference between the input and output
signals of the controlled oscillator (CO). You will find no formulas or other
complex math within this tutorial. I decided to keep it simple. But, before
we go into any detail, first a little bit of history of the Phase-Locked Loop and
prior to that with the superheterodyne.…. [written by Tony van Roon] |
Piezo Pickup Amplifier Circuit - AS098 Jenson Transformer Application
Note (app note 6/07) |
Piezo Vibration Sensors - Circuit diagram of the vibration sensing
circuit out of a toy dog that barks when he senses a thump nearby… [Reverse
engineered schematic by Stepan Novotill] |
Piezoelectric driver finds buzzer’s resonant frequency - 7-Aug-08 Issue
of EDN By driving a piezoelectric buzzer near its resonant frequency and
counting the residual oscillations, a microcontroller can find the buzzer's
resonant frequency.... [Design Idea by Mehmet Efe Ozbek, PhD, Atilim University,
Incek, Ankara, Turkey] |
Piezoelectric Tone Generation Using the MAXQ3210 - Maxim App Note 4148
-- 2/04/2008 -- (app note add 5/08) |
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....(added 04/08)
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Piezoelectric Triggered Switch - Two different switch circuits are
shown. One sources current and the second sinks current. Both switches
are connected to a piezoelectric wafer. When the wafer is tapped, the
switches are activated. (added 7/06) …. [Designed by David A. Johnson] |
Piezoelectric Vibration Sensor Activates Switch - An inexpensive
piezoelectric wafer is used to detect vibration and when the vibration is
sufficient a switch is activated. (added 7/06) …. [Designed by David A.
Johnson] |
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....(added 03/09) |
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.... EDN is migrating links. This link is not
verified. Google the "title" + EDN for new link. |
Shock Sensor Circuit 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%.... EDN is migrating links. This
link is not verified. Google the "title" EDN for new link. |
Ultra Low Power 32kHz Crystal Oscillator - I have used this circuit many
times when I needed a low frequency reference, which did not draw much power.
With the components show, the current from a 3v battery is less than 1.2
microamps. …. [Designed by David A. Johnson] |
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 feedback network.
The voltage applied to the piezoelectric wafer is about 40 volts peak to peak.
The result is a circuit that generates an attention getting sound without drawing
a lot of current. [Designed by David A. Johnson] |
VERY LOUD BEEPER CIRCUIT - 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 maximum efficiency. [Designed by
David A. Johnson] |
Very Loud Piezoelectric Beeper Circuit - This circuit generates a
continuous tone instead of a pulsing one for your hobby project. As seen in the
schematic, the hobby circuit delivers about 110db (12 inches away) from a 9v to
12v source using a single inexpensive C-MOS IC. …. [Hobby Corner Circuit by Dave
Johnson] |
Very Loud Pulsating Beeper Keeps Average DC Current Draw Low |
White LED shines from piezoelectric oscillator supply - 10-Jan-08 Issue
of EDN A piezoelectric ceramic buzzer powers a white LED from a single
cell.... [Design Idea by TA Babu, Chennai, India] |
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