Beeper & Buzzer Circuits, page 5

Beeper & Buzzer Circuits Page 5
Beepers & Buzzers: #-B C-D E-O P-R S-Z
Last Updated on: Friday, March 23, 2012 04:35 PM

Circuits Designed by Dave Johnson, P.E. :

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.

Star Trek Doorbell: In the Star Trek “Next Generation” TV series, the doorbell outside the private quarters of a crew member makes a particular “beep-boop” sound. The 3v battery powered circuit below tries to simulate this sound. The circuit uses one 74HCT74 dual D flip/flop IC, wired as two one-shot circuits. Both are designed to produce a pulse about one half second long. The first pulse turns on a 555 timer to form the beep sound. The second flip/flop one shot ....

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.

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.

Very Loud Pulsating Beeper Keeps Average DC Current Draw Low - Many battery powered alarms draw excessive current when operating. Some of the most attention-getting noise makers, such as the unit shown below, use piezoelectric sound generators with a frequency sweeping tone. When operating with a 9v battery, these units can often draw 100ma or more. In many applications, a continuous alarm sound is not needed. Locating a balloon or a rocket are examples where you want a loud sound but a low average power drain. To lower the average current, the device can be pulsed with short 0.05 second chirps, once every two or three seconds. This lowers the average current by a factor of 60. So, instead of drawing 100ma, by chirping the alarm, the current is lowered to just 2ma. The circuit below generates the pulse train needed for these short but very loud chirp sounds.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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]

Simple blown-fuse indicator sounds an alarm - 10-Jul-08 Issue of EDN A simple blown-fuse-indicator circuit sounds a buzzer and flashes an LED when a fuse blows.... [Design Idea by Vladimir Oleynik, Moscow, Russia]

Simple 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 .... [Design Idea by Dennis Eichenberg, Parma Heights, OH]

Simple Siren - This project is built on the third section of the PC board, identified by "SIREN" and "Project 5." You will notice the similarity between this circuit and the LED FLASHER circuit from project 2. The only differences are the LED has been removed and the 22R resistor has been replaced by a mini speaker....(design added 04/09)

Siren circuit - This circuit was requested by several correspondents. Its purpose was to obtain more power than the siren circuit already available on.... (added 07/07/07)

Star Trek Doorbell - In the Star Trek “Next Generation” TV series, the doorbell outside the private quarters of a crew member makes a particular “beep-boop” sound. The 3v battery powered circuit below tries to simulate this sound. The circuit uses one 74HCT74 dual D flip/flop IC, wired as two one-shot circuits. Both are designed to produce a pulse about one half second long. The first pulse turns on a 555 timer to form the beep sound. The second flip/flop one shot .... [Designed by David A. Johnson]

Three Flashing LED Doorbells - These circuits combine a buzzer with one or more LED displays. When the push switch is operated, the buzzer will sound and the LEDs will flash. When the switch is released, the buzzer will stop, but the LEDs will go on flashing for another 30 seconds or so.,,, [Ron J.'s circuit]

Timed Beeper - Beeps 7.5 seconds after a preset Time Adjustable Time settings:15 sec.30 sec.1 min.2 min. & others (added 9/04)

Two Tone Generator - This two-tone generator includes 3 ICs NE555 Astable Multivibrators. You can vary the duration of each tone by changing the 10k resistor or 100MF capacitor at IC1 or changing resistors and capacitors at IC1/2 for higher or lower tone. Designed by Andrew R. Morris (added 6/03)

Two tone siren - Schematic only, no circuit description

Under-/Over-Voltage Beep for Manual Stabiliser - (electronic Circuit / Schematic added 10/04)

Universal Ding-Dong - One frequently finds gongs or chimes for sale in antique shops or Eastern markets. But supposing one would want to wire these to a pushbutton at the front door to create a ding-dong doorbell? How would this be done? Or consider, for a moment, more creative possibilities. How would one e.g. cause wine-glasses or African drums to resonate when a doorbell is pressed? The circuit shown in Fig. 1 provides a mechanical means of striking two gongs or chimes in sequence -- one when the doorbell is pressed, the other when it is released. This it does by briefly activating two solenoids in.... [Posted by Jospfh]

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 - Many battery powered alarms draw excessive current when operating. Some of the most attention-getting noise makers, such as the unit shown below, use piezoelectric sound generators with a frequency sweeping tone. When operating with a 9v battery, these units can often draw 100ma or more. In many applications, a continuous alarm sound is not needed. Locating a balloon or a rocket are examples where you want a loud sound but a low average power drain. To lower the average current, the device can be pulsed with short 0.05 second chirps, once every two or three seconds. This lowers the average current by a factor of 60. So, instead of drawing 100ma, by chirping the alarm, the current is lowered to just 2ma. The circuit below generates the pulse train needed for these short but very loud chirp sounds.

Wailing Alarm - This circuit provides a warbling sound to any alarm circuit. IC2 is wired as a low frequency astable with a cycle period of about 6 seconds. The slowly varying ramp waveform at C1 is fed to PNP emitter follower Q1, and is then used to frequency modulate alarm generator IC1 via R6. IC1 has a natural center frequency of about 800Hz. [Tony van Roon's circuit]

Warble Alarm - The circuit above provides a 'warble' alarm-call generator that simulates the european 'dee-dah-dee-dah' type sirens used in several european countries.…. [Tony van Roon's circuit]

Whistle Responder - Beeps when hears your whistle A gadget suitable for key-holders, games etc. (added 9/04)

Whooper Alarm, #2 - Destroyer Whooper alarm using 5 transistors…. [Tony van Roon's circuit]

Wireless Doorbell - The transmitter circuit is made up of two building blocks, the 303MHz RF oscillator and the 32kHz crystal controlled oscillator. The 303MHz oscillator consists of a self-oscillating circuit made up of the coil….(diagram added 05/07)

You've Got Mail - 08/19/99 EDN-Design Ideas Many e-mail programs provide a "beep" or a pop-up message box signaling the user that a new e-mail message has arrived. If you are too far from the computer to hear the audible signal or if the monitor is turned off, then.... [Design Idea by ary Kath and Craig Bishop, Scotch Plains, NJ]

Beepers & Buzzers: #-B C-D E-O P-R S-Z