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Subject: Re: How do I drive a Piezo speaker

Date: 07/05/02 at 3:11 PM
Posted by: Ray
E-mail: rrogers@plaidheron.com
Message Posted:

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.
http://www.national.com/pf/LM/LM555.html
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.

Ray


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