Beeper & Buzzer Circuits, page 2

Beeper & Buzzer Circuits Page 2
Beepers & Buzzers: #-B C-D E-O P-R S-Z
Last Updated on: Monday, October 03, 2011 06:07 PM

Circuits Designed by Dave Johnson, P.E. :

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)

Door Knock Beeper NEW
In some apartment buildings and homes, not equipped with a door bell, it may be hard to hear someone knocking on the front door. The circuit below provides a means to activate a loud beeping sound inside, whenever someone knocks on the door from the outside. The circuit is powered by a 9v battery, which should provide years of service. An on/off switch allows the device to be turned off if desired...

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

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) �. [Hobby Corner Circuit by Dave Johnson]

Click Sound Generator - Often in computer controlled systems, you would like to generate a �click� sound whenever a button is pressed. This provides the user with audible feedback that the pushbutton press has been acknowledged. The two circuits below generate such a sound. A click sound is generated each time the logic input swings from a logic low to high condition.... [Designed by David A. Johnson]

Continuity buzzer is frugal with power - 04/15/99 Issue of EDN 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....Page includes several designs. Scroll to find this one.... [Design Idea by Hans Krobath, EEC, Nesconset, NY]

Counter with Doorbell - This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors....(electronic design added 6/07) [Circuit by Andy Collison]

Cuckoo sound Generator - This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape recorders etc. In this case, the built-in audio amplifier and loudspeaker may be omitted and the output taken from C8 and ground.�.(Circuit design added 08/08) [Site is under construction right now]

Curious C Beeper - The Curious C-Beeper uses the two-transistor flasher in conjunction with a darlington transistor to make a most unusual capacitance beeper probe. When a capacitor is touched to the probe, the probe beeps at a frequency that varies with capacitance. The frequency change....(electronic circuit added 7/03)

DC/DC Converter operates from Phone Line - 15-Jan-98 Issue of EDN 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.... [Design Idea by Gary Shockey, Linear Technology Corp, Milpitas, CA]

Destroyer Whooper Alarm - If you've ever watched any TV at all and seen those old WWII navy movies, you've heard that distinctive "whoop-whoop-whoop" as a destroyer sliced through the waves, guns blazing, and everybody yelling "battle stations!".... [Tony van Roon's circuit]

DIN Audio Pinouts - �.(design added 03/08)

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

Door chime Privacy Sentry ATtiny12 - An ATtiny12 controller as a timer and some switching circuitry turns the doorbell off for 10 hours at the same time each day�.(schematic / circuit added 6/07)

Door Knock Beeper - In some apartment buildings and homes, not equipped with a door bell, it may be hard to hear someone knocking on the front door. The circuit below provides a means to activate a loud beeping sound inside, whenever someone knocks on the door from the outside. The circuit is powered by a 9v battery, which should provide years of service. An on/off switch allows the device to be turned off if desired.... [Designed by David A. Johnson]

Doorbell Chime - (electronic circuit added 6/07)

Doorbell for the Deaf - This circuit provides a delayed visual indication when a door bell switch is pressed. In addition, a DPDT switch can be moved from within the house which will light a lamp in the door bell switch. The lamp can illuminate the words "Please Wait" for anyone with walking difficulties.... by Andy Collison]

Doorbell Warning Switch - This circuit should only be used with the solenoid type chime doorbells, the electronic type that play tunes will not work here. The hardest part for this circuit was the title. It is quite easy to miss the sound of a doorbell if you are watching TV , this circuit gets round the problem by providing a visual indication, i.e. a lamp.... [Circuit design by Andy Collison]

Doorbell with Counter - This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors....(electronic circuit added 1/03)

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