>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 08 September 2005 02:49
>To: Microcontroller discussion list - Public.
>Subject: Re:[EE] Piezo buzzers
>
>
>> Can I drive piezo buzzers straight from PIC pins? No resistor ?
>
>Piezo elements are very capacitive and I don't think a single 
>PIC pin has the cojones to drive them directly, for example 
>with PWM. 

I have tried this quite recently, and the PIC has enough grunt to get reasonable volume, better if you can use two PIC pins and drive them in anti-phase to double the voltage swing.

What really makes a huge difference to piezo sounders volume is mountning them in a resonant cavity, i.e. like the plastic encapsulated PCB mounted piezo elements you can get.

Regards

Mike

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