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Beeper & Buzzer Circuits
Page 3
Beepers & Buzzers: #-B
C-D E-O
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Last Updated on:
Monday, October 03, 2011 06:08 PM |
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Circuits Designed by Dave Johnson, P.E. : |
- Front Desk Service Beeper:
This device functions like a lobby desk service request bell. A short beep is
sounded whenever the large pushbutton on top of the device is pressed. Once
pressed, the device will not make another beep until at least 2 minutes of time has
elapsed. This prevents impatient customers from ringing the bell over and
over.
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HIGH SOUND OUTPUT BEEPER CIRCUIT
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. Published in Electronic Design, Aug 5, 1993
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MACHINE POWER LOSS BEEPER
For some medical equipment it is important for an operator when power is lost to the
machine. The beeper is powered from a 9v battery and requires the machine to have a
power switch with a third set of contacts.
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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Electronic buzzer - This very simple circuit just uses a couple
of resistors, a capacitor and the easily available 555 timer IC. The 555
is setup as an astable multivibrator operating at a frequency of about
1kHz that produces a shrill noise when switched on. The frequency can be
changed by varying the 10K resistor.... [Radioland.nt.au] |
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Electronic Canary Doorbell - This circuit is a modified "Hartley
Oscillator" with a couple extra parts. T1, the LT700 (Tony van
Roon's or equivalent, is a small center tapped (Tony van Roon's ct) audio
transformer with an impedance of 1000 ohms at 1000 hertz..... [Tony
van Roon's circuit] |
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Electronic Chime - Scroll Down to find this circuit. This
circuit simulates a chime similar to the sound many cars make when the
keys are left in the ignition. The bottom two gates form a squarewave
audio oscillator that drives the base of the 2N4401, turning it on and off
at an audio rate. The top two gates produce a short low-going pulse about
once per second.... (electronic design added 6/07) |
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Electronic Siren - An electronic siren made from discrete
components. (schematic added 03/04/05) |
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Electronic Whistle - Schematic only, no circuit description
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Emergency Vehicle Car Siren - This siren circuit simulates police, fire
or other emergency sirens that produce an up and down wail. (Circuit design
added 08/08) |
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Fix Adds Door Chime Repeater - 05/13/99 EDN-Design Ideas
Electromechanical door chimes can enhance your home, but they are vulnerable to
costly repair problems. A defective pushbutton switch or a careless visitor can
maintain the chime in an energized state for a prolonged period, thereby damaging
the chime. The circuit in Figure 1 prevents damage to the chime and improves the
chime's effectivenessElectromechanical door chimes can enhance your home, but they
are vulnerable to costly repair problems. A defective pushbutton switch or a
careless visitor can maintain the chime in an energized state for a prolonged
period, thereby damaging the chime. The circuit in Figure 1 prevents damage to the
chime and improves the chime's effectiveness.... [Design Idea by Dennis Eichenberg,
Parma Heights, OH] |
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Flip Flop Flashers Buzzers Etc - Several circuits here. The
familiar astable flip-flop circuit is a handy configuration for making flashers or
generating squarewaves. Here is a typical alternating LED flasher with the LEDs in
the emitters instead of collectors as is normally done. The bias resistors are
directly connected....(added 04/05/06) |
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Front Desk Service Beeper - This device functions like a lobby desk
service request bell. A short beep is sounded whenever the large pushbutton
on top of the device is pressed. Once pressed, the device will not make
another beep until at least 2 minutes of time has elapsed. This prevents impatient
customers from ringing the bell over and over. Posted …. [Hobby Corner Circuit by
Dave Johnson] |
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Generating -5 Volts From a 9 Volt Battery - A 555 timer can be used to
generate a squarewave to produce a negative voltage relative to the negative
battery terminal. When the timer output at pin 3 goes positive, the series 22 uF
capacitor charges through the diode (D1) to about 8 volts. When the output
switches to ground, the 22 uF cap discharges through the second diode (D2) and
charges the 100 uF capacitor to a negative voltage. The negative voltage can rise
over several cycles to about -7 volts but.... [Circuit designed by Bill Bowden] |
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Harvest energy using a piezoelectric buzzer - 20-Mar-08 Issue of EDN
You can harvest small amounts of mechanical energy using a piezoelectric buzzer to
charge a supercapacitor.... [Design Idea by Carlos Cossio, Santander, Spain] |
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Hee Haw Siren - Build the circuit and listen. Change the resistors and
capacitors to get all sorts of different results. |
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High Sound Output Beeper Circuit - 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. Published in Electronic
Design, Aug 5, 1993 …. [Designed by David A. Johnson] |
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Inexpensive LED Drives Flash & Beep Circuit - 06/05/97 EDN-Design Ideas
[Design Idea added 4/02] EDN migrating links. This link is not verified.
Google the "title" EDN for new link. |
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Machine Power Loss Beeper - For some medical equipment it is important
for an operator when power is lost to the machine. The beeper is powered from a 9v
battery and requires the machine to have a power switch with a third set of
contacts. …. [Designed by David A. Johnson] |
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Multi-Switch Doorbell with Indicators - (electronic Circuit / Schematic
added 10/04) |
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Novel Buzzer - (diagram added12/09) |
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One IC 2 Tones Siren Double Tone Police Sound Single Tone Old Ambulance Sound
- This circuit is intended for children fun, and is suitable to be installed
on bicycles, battery powered cars and motorcycles, but also in models and other
games. With SW1 positioned as shown in the circuit diagram it reproduces the
typical dual tone sound of Police....(added 9/04) |
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Beepers &
Buzzers: #-B C-D
E-O P-R
S-Z
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