Originally Posted by Allodoxaphobia[_2_]

On Mon, 23 Jul 2012 04:13:21 +0000, vu2nan wrote:
;793804 Wrote:
what is postive and negative on a round buzzer where contacs are an
inside center circle and an outside ring ?

or does positive and negative matter with a piezo buzzer ?

I suppose you are referring to the piezo element alone. In that case the
answer is 'no polarity' as the element responds to an ac signal only.

.... or pulsed DC.