Post by thread:[EE] Good beeping component

'[EE] Good beeping component'

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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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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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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>

> 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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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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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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