This is a multi-part message in MIME format. ------=_NextPart_000_1023_01C8D3AA.E84A3EA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit >So what do I do, stick a diode in series with it? The usual way would be to isolate the piezo from the PIC and a diode won't do that effectively Attached are some drivers I use with piezo elements, and the schematic of a high-volume two-tone piezo alarm for comparison. This sound bomb has enough dB to be most uncomfortable to the ears. "piezo_drive.gif" is easily heard throughout the house Note that piezo elements are capacitive in nature, hence the 1k across it. If you don't include that, the sound will be quite weak Be aware that a piezo might impress electrical noise onto Vdd and should be well decoupled Two-terminal self-contained 'beepers' have both drive and HV- generation (often around 30VDC) circuitry built-in. You might also find that smaller ones have a magnetic core for better drive A simpler method is to put the piezo between two I/O pins and drive it with reciprocating pulses (ie o/p1 high, op2 low, then o/p1 low, o/p2 high) at the resonant frequency ------=_NextPart_000_1023_01C8D3AA.E84A3EA0 Content-Type: image/gif; name="piezo3.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="piezo3.gif" R0lGODlhSQG7AIAAAAAAAP///ywAAAAASQG7AEAC/oyPqcvtD6OctNqLs968Z3CAniOCZXCmhjhy wMuy7Uxfcowmcs33vvsLAoWPHfEogemCOIRyZcqFkprmyoldQo0+LvL6DYvHRS/5a7Zh0ue2u8Z+ N+IRer0Oy+v1Rbn/z/AEeDdEKGXVYze46NZ0M3WF88ijSNJSmcWoudnHuYAZ+AbqSSo2GshnlDc1 2blxOgNbOvsjSyTosYcLycpbRftLsVP5mGayKqVVgWlr8QIWKwo8/YG4tvzX3NyxTf3pK/zt3A1N lYnynJxYKO2dHULulB5OL6ftjGV8eP6pu8drxd8uVTmiGCzoDpvCCfHYXfMjKwqYbUoqPrPYcBEo /mIZg3kk0zHhrJD82twzKTLlB5CZTtA4eYakyk0yyzVyaGqmToY7e/r8iQ+o0KFE1RU9ijSp0qVM mzp9us6myprIjKK8GSqgVWpVrY2QCE0SKz6G1ESaqK4YvJrKYkJVypZTPIF0d70dGpcSt0sP7yLN 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