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Beeper & Buzzer Circuits   Page 1
Beepers & Buzzers:  #-B    C-D     E-O      P-R      S-Z

Last Updated on: Thursday, June 25, 2015 06:20 AM
 

Circuits Designed by Dave Johnson, P.E. :

  • 12kv Power Supply -  If you need about 12,000 volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line… [Hobby Circuit designed by David Johnson P.E., 3/27/99]
     

  • 1us Light Pulse Receiver -  This circuit is designed to detect very weak light pulses lasting 1uS. It uses a tuned LC feedback network to provide high sensitivity while giving high ambient light immunity. A post voltage amplifier is included with a gain of about X20… [Hobby Circuit designed by Dave Johnson P.E., 3/11/99]

  • 24V DC Powered Beeper with 4 Separate Inputs -  24vac is a popular voltage.  It is often used in low voltage lighting systems and industrial controls.  It is much less dangerous than 120vac/240vac line voltages.  This hobby circuit below is one method to efficiently power a cluster of 7 white LEDs from 24vac.… [Hobby Circuit designed by David Johnson P.E., 12/19/09]
     

  • 24VAC-Powered White LEDs -  24vac is a popular voltage.  It is often used in low voltage lighting systems and industrial controls.  It is much less dangerous than 120vac/240vac line voltages.  The circuit below is one method to efficiently power a cluster of 7 white LEDs from 24vac… [Circuit by David A. Johnson P.E., 12/19/09]
     

  • 3v Powered Loud 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 … [Circuit by David A. Johnson P.E., 2/18/09]
     

  • 3v Sweeping Siren Alarm -  A while back I was challenged by a visitor to the website.  He needed a very loud sweeping siren type audio sound generator powered by 3v.  He tried some of the commercial sirens but they were not very loud when powered by 3v.  He also said that those… [Hobby Circuit designed by Dave Johnson P.E., 6/24/08]
     

  • AC Line Powered LED Flasher -  Some of the latest LEDs are amazing.  They can produce a surprising amount of light with very little current.  In the light flasher application shown below I take advantage of a nice surface mounted LED from King Bright.  This flasher circuit draws only about 3ua of average current from the AC power line to flash this green LED.  This flasher might be used as a power indicator light… [Hobby Circuit designed by David Johnson P.E., 12/07/08]
     

  • AC Line Powered LED Pilot Light -  This simple circuit can be used to light a LED indicator lamp, powered from the 120vac line.  I have included component values for 240vac lines as well… [Hobby Circuit designed by David Johnson P.E., 7/09/06]
     

  • AC Line Under/Over Voltage Alarm -  Power lines, which deviate much beyond normal voltages can damage expensive electronic equipment.  The circuit below sounds an alarm whenever the line voltage is higher or lower than normal.  I set the alarm limits at about +-15% from standard levels… [Hobby Circuit designed by David Johnson P.E., 3/29/09]
     

  • AC Power Loss Alarm -  I’ve been having a problem with my instant hot water system lately.  This system circulates electrically heated water throughout my house using a small pump.  The pump is wired into a ground fault interrupter (GFI) module.  Every now and then, the GFI trips, leaving me without hot water… [Hobby Circuit designed by David A. Johnson P.E., 3/29/09]
     

  • Alarm Beeps when the “Check Engine” Light Turns On -  When wired into a car’s indicator light panel, this circuit will turn on a loud beeper when the “check engine” light turns on… [Circuit by David A. Johnson P.E., 7/09/06]
     

  • 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 piezo device to more than 200 volts peak to peak… [Hobby Circuit designed by David Johnson P.E., 6/27/00]

  • 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… [Hobby Circuit designed by Dave Johnson P.E., 6/04/00]
     

  • Basement Remote Doorbell -  This circuit will activate a beeper alarm whenever the AC line voltage is less than 100vac… [Hobby Circuit designed by David Johnson P.E., 7/11/06]
     

  • Beeper indicats Check Engine -  When driving down a busy road, you may not notice a “check engine” indicator light that suddenly turns on within the car’s instrument panel.  You could drive for many miles before noticing the light.  To provide an audible indication of trouble, the hobby… [Hobby Circuit designed by David Johnson P.E., 7/09/06]
     

  • Beeper that is Very Loud -  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 piezolectric beeping device is driven at resonance to insure maxim… [Circuit by Dave Johnson P.E., 6/03/00]
     

  • Broad Band 2Mhz Optical Fiber Receiver -  If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector… [Hobby Circuit designed by David A. Johnson P.E., 6/09/00]


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

1 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. . .  [Flavio Dellepiane's web site]

 

24V DC Powered Beeper with 4 Separate Inputs -  24vac is a popular voltage. It is often used in low voltage lighting systems and industrial controls. It is much less dangerous than 120vac/240vac line voltages. This hobby circuit below is one method to efficiently power a cluster of 7 white LEDs from 24vac.  . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/19/09]

 

2-wire Game Show Time -  Several Game Show timers included, scroll to find this one. The game show timer determines which contestant presses their button first by lighting a lamp and ringing a bell and the slower  contestants are locked out. The circuit is convenient in that only two wires are needed to interconnect the stations and the wires may all go back to the base unit or they may be "daisy-chained" between stations. There is no electronic limit on the number of stations. The circuit uses a 24 volt power source and 12 volt lamps when built as shown but the experienced experimenter may scale these voltages along with the zener voltages if desired. If the SCR triggers when the power is applied or when the reset button is pressed, add a 0. 1uF capacitor from anode to cathode. (A sudden increase in voltage across some SCRs can trigger them, especially if the gate impedance is high. ) . . .  [Charles Wenzel (unless otherwise noted)]

 

3 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]

 

3v Powered Loud 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  . . . [Circuit by David A. Johnson P.E.,  02/18/09]

 

3v Sweeping Siren Alarm -  A while back I was challenged by a visitor to the website. He needed a very loud sweeping siren type audio sound generator powered by 3v. He tried some of the commercial sirens but they were not very loud when powered by 3v. He also said that those . . . [Circuit by David Johnson P.E.,  06/24/08]

 

555 Siren Generator -  a simple design from 2 555 timers - this is versatile and loud. . . .  [by P. Townshend - EduTek Ltd]

 

555 Tone Generator 8 Ohm Speaker -  This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained directly from the 555 (limit = 200 mA). A small capacitor is used at the transistor. . .  [Circuit designed by Bill Bowden]

 

A simple 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]

 

AC Power Loss Alarm -  I’ve been having a problem with my instant hot water system lately. This system circulates electrically heated water throughout my house using a small pump. The pump is wired into a ground fault interrupter (GFI) module. Every now and then, the GFI trips, leaving me without hot water . . . [Circuit by David Johnson P.E.,  03/29/09]

 

Add a door-chime repeater -  05/13/99 EDN Design Idea   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 effectiveness by repeating the chime strike for as long as the pushbutton remains depressed. The circuit controls both front and rear chimes. The heart of the circuit is timer IC2, which you configure as an astable multivibrator. The timing components, R1, R2, R3, and C3, provide the required pulse widths. . . .  [by Dennis Eichenberg, Parma Heights, OH]

 

Alarm Beeps when the “Check Engine” Light Turns On -  When wired into a car’s indicator light panel, this circuit will turn on a loud beeper when the “check engine” light turns on . . . [Circuit by David A. Johnson P.E.,  07/09/06]

 

American Police Car Siren (linscott) -  Scroll down to locate this 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 low frequency astable timer which generates a ramp waveform of about 6 seconds that is buffered by the transistor and again used to frequency modulate the tone generator. The transistor is used to help strengthen the signal to the speaker. . .  [Randy Linscott's website]

 

AN16 Automotive & Household Siren Driver Circuits: Zsd100 & Discrete 'H'-Bridge Minimum Parts Count Solution -  Zetex Semiconductors Applications Note:   A solution is provided that uses a minimum number of components by utilizing an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors. . . . 

 

Another Game Show Timer -  Several Game Show timers included, scroll to find this one. Here is a somewhat more complex version that uses easily found bipolar transistors. Note that it requires only two wires between stations and base and those wires can be connected anywhere on the "buss". (You can wire each station back to the base unit or "daisy chain" the stations from one to the next with only one set of wires going back to the base unit. ). . .  [Charles Wenzel (unless otherwise noted)]

 

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 piezo device to more than 200 volts peak to peak . . . [Circuit by Dave Johnson P.E.,  06/27/00]

 

Appliance Unplugged Alarm -  I received a call from an administrator at a large prison. He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area. He wanted a battery-powered device, which could be mounted to the outside of the power cord of an appliance.  . . . [Hobby Circuit designed by David A. Johnson P.E.,  04/25/10]

 

Audio MilliVoltmeter -  For Testing Amplifiers (etc) , An analogue design, 3mV to 30V with dB scale. . . 

 

Automotive & Household Siren Driver Circuits: Zsd100 & Discrete 'H'-Bridge Minimum Parts Count Solution -  Zetex Semiconductors Applications Note:   A solution is provided that uses a minimum number of components by utilizing an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors. . . . 

 

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 . . . [Circuit by Dave Johnson P.E.,  06/04/00]

 

Basement Remote Doorbell -  This circuit will activate a beeper alarm whenever the AC line voltage is less than 100vac . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]

 

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. . . .  [Circuit designed by Forrest Cook]

 

Beeper Bug -  This bug can be attached to anything from a glider to a plant and you can track it with a radio. Why track a plant? The Beeper is the result of many requests for a mini tracking device and introduces a new world of tracking. . .  [email Colin Mitchell: talking AT tpg.com.au]

 

Beeper indicats Check Engine -  When driving down a busy road, you may not notice a “check engine” indicator light that suddenly turns on within the car’s instrument panel. You could drive for many miles before noticing the light. To provide an audible indication of trouble, the hobby . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]

 

Beeper that is Very Loud -  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 maxim . . . [Circuit by David Johnson P.E.,  06/03/00]

 

Bells ring Generator -  Three circuit options; Can be synchronized to Christmas tree flashing lights. . .  [Flavio Dellepiane's web site]

 

Birdie Doorbell Ringer -  P1 is of experimental value. Start with 220 Ohms or so and modify to suit your needs. The transistor is a general purpose kind and is not critical, almost any PNP type will work. L1 is a bell-transformer which is usually already present in the house. If you wish, you could use a battery instead of the bell transformer. Just hookup a 9-volt battery (or wall adapter) to points 'A' and 'B' (A=+) the diode (D1) is to protect the circuit from accidental polarity reversal and is optional, but required as a rectifier for use with the bell transformer. . .  [Tony van Roon's circuit]

 

Blown-Fuse Indicator Sounds An Alarm -  07/10/08  EDN Design Idea   A simple blown-fuse-indicator circuit sounds a buzzer and flashes an LED when a fuse blows. Safety fuses or fusible links see wide use in modern electronic equipment to protect the load and the power supply—especially batteries—against short circuits and excessive load current. Fuses are inexpensive and simple, and a wide range of parts is available. However, you must replace them when they blow, and, when they do, you need an indicating circuit that warns you about its failure, especially when the fuse body is ceramic or sand-filled for improved protection against arcing. . . .  [by Vladimir Oleynik]

 

British Police Car Siren -  The first circuit simulates the siren of a British police car. 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 a 1 Hz astable multivibrater. . .  [Randy Linscott's website] 


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


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