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

Last Updated on: Saturday, March 14, 2015 06:34 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:
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..... [Hobby Corner Circuit by Dave Johnson]
3V Sweeping Siren Alarm -  The circuit uses a LTC1799 precision frequency generator from Linear Technology.  A 74HC14 hex Schmitt trigger from Texas Instruments is also used to perform several other functions.  One section is wired as a simple 7Hz square wave oscillator.… …. [Hobby Corner Circuit by Dave Johnson]
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]
  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....(electronic design added 08/08/08)
AN16 Automotive & Household Siren Driver Circuits: Zsd100 & Discrete 'H'-Bridge Minimum Parts Count Solution -  Zetec Semiconductors  Applications Notes 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.   (app note added 2/06)
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 piezoelectric device to more than 200 volts peak to peak. It cranks out an ear splitting 120db when measured at 12 inches.... [Designed by David A. Johnson]
Assortment of Siren Circuits -  several circuits here, spend some time and view each of them
Audio MilliVoltmeter -  For Testing Amplifiers (etc), An analogue design, 3mV to 30V with dB scale (schematic / Circuit design added 9/02)
Automotive & Household Siren Driver Circuits: Zsd100 & Discrete 'H'-Bridge Minimum Parts Count Solution -  Zetec Semiconductors  Applications Notes 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.   (app note added 2/06)
Basement Doorbell -  This circuit will activate a beeper in the basement, whenever the front doorbell is pressed.... [Designed by David A. Johnson]
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. …. [Hobby Corner Circuit by Dave Johnson]
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….(circuit added 09/09/09)
Bells Ring Generator -  Three circuit options.  Can be synchronized to Christmas tree flashing lights.  (electronic circuit added 09/04) 
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]
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....(electronic design added 08/08/08)

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



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