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Subject: Re: How do I drive a Piezo speaker
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Date: 07/05/02 at 3:11 PM
Posted by: Ray
In Reply to: How do I drive a Piezo speaker posted by Rance on 07/05/02 at 2:19 PM:
I haven't worked with Piezo speaker; but I am pretty sure that you still have to drive them with an audio frequency electrical signal.
I hope you realize that sound is varying air pressure that occurs in the "audio frequency" range.
In any case you should be able to use an LM555.
They are calling the VCO a pulse position modulator.
The LM555 is a good deal for you since it was very popular.
There up Application Notes (up to books) on using it.
From your question I presume that I need to mention that you need an Audio Amplifier to drive the speaker. National has integrated audio amplifiers, and TI has Class D amplifiers and associated evaluation boards.
Attaching the LM555 to some Evaluation board is probably your best bet to get started.
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