This is a multi-part message in MIME format. ------=_NextPart_000_0EDD_01C89F05.3AC0DCF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > So anyone have some good suggestions or references to > what they have used in the past? Both of these circuits will give higher volume from a single pin by driving a bare piezo disc with more voltage. Finding the resonant frequency of the disc is important for best volume too. 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