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'[EE] Good beeping component'
2004\10\04@144816 by Padu

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Any pointers on a good inexpensive component that emits a reasonable loud beep? Pointers on how to connect and drive them using a PIC would be nice too.

Padu
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2004\10\04@145616 by Dave VanHorn

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At 01:47 PM 10/4/2004, Padu wrote:

>Any pointers on a good inexpensive component that emits a reasonable loud beep? Pointers on how to connect and drive them using a PIC would be nice too.

Projects Unlimited has good hooters.

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2004\10\04@153731 by Cris Wilson

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At 11:47 AM 10/4/2004 -0700, you wrote:
>Any pointers on a good inexpensive component that emits a reasonable loud
>beep? Pointers on how to connect and drive them using a PIC would be nice too.

You can try: http://www4.tpg.com.au/users/talking/Piezo_experiments_page1.html

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Clemson University
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2004\10\04@155819 by Padu

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>
> Projects Unlimited has good hooters.
>

Thanks! I see that they offer an unlimited variety of buzzers with different
specs. If I want to plug it to my development kit, does it mean that I have
to choose one that works @ 3V or 5V? The louder ones operate at @ 10V or
12V. Any suggestion on an easy way to make it work?

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2004\10\04@160229 by Mike Harrison
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On Mon, 4 Oct 2004 11:47:01 -0700, you wrote:

>Any pointers on a good inexpensive component that emits a reasonable loud beep? Pointers on how to connect and drive them using a PIC would be nice too.

My favorite is a NPN transistor driver with a cheap 100 millihenry low-current inductor from
collector to V+ (preferably  9-12V), and a piezo transducer across the inductor. Driven at the
piezo's resonant freq, it gets REALLY loud, and develops typically 30-40v across the piezo.
Be careful not to drive it with the piezo unconnected as it can generate >200V which will kill the
transistor. This can be protected against using a MPSA42 (SMD : MMBTA92/FMMTA42) instead of a
regular NPN transistor, but you may need a lower base resistor due to lower gain.

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2004\10\04@160530 by Dave VanHorn

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At 02:57 PM 10/4/2004, Padu wrote:

>>
>> Projects Unlimited has good hooters.
>>
>
>Thanks! I see that they offer an unlimited variety of buzzers with different
>specs. If I want to plug it to my development kit, does it mean that I have
>to choose one that works @ 3V or 5V? The louder ones operate at @ 10V or
>12V. Any suggestion on an easy way to make it work?

Well, so much depends on exactly what you're trying to do.
The higher voltage units can easily be interfaced to a micro, with something as simple as a 2N7000 or 2N2904 transistor.


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