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Beeper & Buzzer Circuits   Page 2
Beepers & Buzzers:  #-D      E-R      S-Z

Last Updated on: Friday, March 12, 2010 12:07 PM

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.
  • 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
  • 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.
  • 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.
  • Power Reminder Beeper
    This circuit produces a short beep once each minute. It is powered directly off the 120vac power line to remind you that a device connected to the circuit is turned on. It is simple enough to be packaged inside a small plastic box. It might be ideal for computers, printers or some test equipment that shouldn't be left on all night.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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.  (added 6/06)
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.  The secondary of this transformer has an impedance of 8 ohms.  Usually noted as 1K:8 ct.  I tried a couple other models like the red and green types (Tony van Roon's taken out of a $5 made-in-china am pocket radio) and they both work good.  You may have to adjust the caps to get the sound... (Tony van Roon's electronic design added 2/06)
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 that discharges the 10 uF capacitor through the diode. The voltage then jumps up and slowly decays .... (electronic design added 6/07)
Electronic Police Siren - The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors...(electronic design added 08/08/08)
Electronic Siren - An electronic siren made from discrete components.  (schematic added 03/04/05)
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)
Fix Adds Door Chime Repeater - 05/13/99 EDN-Design Ideas:.....(design idea added 70/08/09)
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)
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 ….(designed by David A. Johnson)
Harvest energy using a piezoelectric buzzer - 03/20/08 EDN-Design Ideas: You can harvest small amounts of mechanical energy using a piezoelectric buzzer to charge a supercapacitor.....(design idea added 09/08)
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)
Inexpensive LED Drives Flash & Beep Circuit - 06/05/97 EDN-Design Ideas: (design idea added 4/02)
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)
Multi-Switch Doorbell with Indicators - (electronic Circuit / Schematic added 10/04)
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)
Personal Alarm redcircuits - Small portable, anti-bag-snatching unit.  Also suitable for Doors and windows control (added 9/04)
Piezo device generates buzz beep or chime  - 05/07/98 EDN-Design Ideas: (design idea added 6/06)
Piezo DeviceGenerates Buzz Beep or Chime  - 04/23/98 EDN-Design Ideas: (design idea added 05/03) 
Piezoelectric driver finds buzzer’s resonant frequency - 08/07/08 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.....(design idea added 09/08)
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. ….(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. ….(designed by David A. Johnson)
Police Car Siren - This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail.  (circuit design added 08/08)
Power Reminder Beeper - This hobby electronic circuit produces a short beep once each minute. It is powered directly off the 120vac power line to remind you that a device connected to the circuit is turned on. It is simple enough to be packaged inside a small plastic box. It might be ideal for computers, printers or some test equipment that shouldn't be left on all night. ….(designed by David A. Johnson)
Powerful Siren - Simple circuitry No ICs 12V Battery operation (added 9/04)
Pushbutton Activated Service Request Beeper - A single press of a pushbutton switch turns on a beeper for one second but can’t be activated again for 60 seconds.  (added 7/06) ….(designed by David A. Johnson)
Red Alert Star Trek Alarm - Scroll down to locate this circuit. The third circuit simulates the "Red Alert" siren from the TV show Star Trek. It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is wired as a 1.5 second non-symmetrical....(electronic design added 6/07)
Remarkable R-Beeper-by Tom Bruhns - (circuit added 07/07/07)
Remote Doorbell Indicator - (electronic schematic / circuit added 4/02)

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