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Beeper & Buzzer Circuits   Page 1
Beepers & Buzzers:  #-D      E-R      S-Z
Last Updated on: Thursday, April 24, 2008 05:07 PM
Circuits Designed by Dave Johnson, P.E. :

  • 24V DC Powered Beeper with 4 Separate Inputs
    24v DC is a very popular voltage used in industrial settings.  The circuit below was designed to accept four different 24v DC alarm input signals, which are then used to drive a single low power beeper.  The beeper is a magnetic type with its own oscillator/driver.  The four diodes form an “OR” gate so any one of the four inputs will cause the beeper to make noise.  A CMOS version of the popular 555 timer is used to strobe the beeper on and off at about 1Hz.
  • 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.
  • BASEMENT DOORBELL BEEPER
    If you can't hear your doorbell when you are in your basement try this circuit. This circuit takes advantage of the 24vac power source located near the furnace. Using a simple current transformer technique, the circuit sounds a beeper whenever the main door chime is activated.
  • Check Engine Beeper
    When wired into a car’s indicator light panel, this circuit will turn on a loud beeper when the “check engine” light turns on.  (added 7/06)
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

 

3 Tone Gong:  Suitable for use as a door bell (added 3/03)

555 Tone Generator 8 Ohm Speaker:  (circuit added 7/02)

A Simple Electronic Buzzer:  This very simple circuit just uses a couple of resistors, a capacitor and  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  10K resistor.   (added 6/06)

AN16 Automotive and Household Siren Driver Circuits: Zsd100 and Discrete 'H'-Bridge Minimum Parts Count Solution:  Zetec Semiconductors  Applications Notes A solution is provided that uses a minimum number of components by utilising an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors.   (app note added 2/06)

Audio MilliVoltmeter:  (schematic / circuit design added 9/02)

Automotive and Household Siren Driver Circuits: Zsd100 and Discrete 'H'-Bridge Minimum Parts Count Solution:  Zetec Semiconductors  Applications Notes A solution is provided that uses a minimum number of components by utilising an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors.   (app note added 2/06)

Basement Doorbell Extension:  (schematic added 9/06)

Battery Low Voltage Beeper:  This circuit provides an audible and visual low voltage warning for 12V battery powered devices. Idle current: 6ma Low Voltage Warning current: 15ma…. (schematic / circuit design added 9/02)

Beeper:  This circuit produces  sound of a beeper like  one in pagers which produces a "beep-beep" sound. Basically  circuit consists of a 555 timer oscillator which is turned ON and OFF periodically. The first C (left) oscillates at about 1Hz. The second IC is turned ON and OFF by  first IC. The first IC determines how fast  second IC is turned ON/OFF and second IC determines  tone of  final output. By varying  VR1,  changeover rate can be adjusted. By varying VR2  tone can be adjusted. If you know something about electronics, you can try replacing  2nd 555 IC circuit with a piezoelectric buzzer. This saves one IC and associated components but  buzzer cannot give a loud sound as  speaker and also its tone cannot be varied. (added 6/06)

Bells Ring Generator:  3-Circuit options Can be synchronized to Christmas tree flashing lights (added 9/04)

Birdie Doorbell Ringer:  (electronic (schematic / circuit added 4/02)

Bull Horn:  (circuit added 10/06)

Buzzer:  (electronic circuit added 8/02)

Continuity Buzzer is Frugal with Power:  04/15/99 EDN-Design Ideas / (added 11/05) [Note:  File contains multiple circuits.  Scroll to find this one]  The continuity detector in Figure 1 is based on W Dijkstra's "Fleapower circuit detects short circuits" (EDN, July 2, 1998, pg 122). The buzzer indicator allows you to devote full attention to making the connection without having to observe an LED. The circuit also consumes less power than Dijkstra's circuit. Power comes from two AA or AAA cells, which last for a period equal to their shelf life. Current consumption is less than 2.5 mA when the circuit detects continuity and less than 1.7 mA for an open circuit. Open-circuit voltage is less than 100 mV, and short-circuit current is less than 1 mA. You can use a number of op amps for IC1, provided that the specs indicate rail-to-rail operation with a low-voltage single supply....

Controller Provides Multiple Alarm Driver Formats:  01/15/98 EDN-Design Ideas  /  (added 08/05)  DC/DC converters for use inside the telephone handset require operation from the high-source-impedance phone line. Additionally, the CCITT specifications call for maximum on-hook power consumption of 25 mA. The dc/dc converter in Figure 1 is 70%-efficient at an input power of 25 mA, providing 5V at 3.4 mA. Controlled, low-peak switch current ensures that the ­48V input line experiences no excessive voltage drops during switching.

Cuckoo sound Generator:  Agreeable, very close sound imitation Suitable for sound effects, door-bells etc. (added 9/04)

Curious C Beeper:  (electronic circuit added 7/03)

Ding-Dong Bell:  (electronic Circuit / Schematic added 10/04)

Door Chime:  This is a circuit that could be used as a doorbell system like those that most homes have. From what I can tell, pressing the switch triggers the IC to oscillate and send electricity through the transistors to power the speaker. The IC type is not listed, but I am guessing that it is a 555 Timer. (schematic / circuit added 10/06)

 

Doorbell for the Deaf:  (electronic (schematic / circuit added 4/02)

Doorbell for the Deaf:  (electronic design added 10/06)

Doorbell with Counter:  (electronic circuit added 1/03)

Beepers & Buzzers:  #-D      E-R      S-Z

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