This is a multi-part message in MIME format. ------=_NextPart_000_04C6_01CAB52C.E4392820 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit > It's a two-terminal device; I am driving it with a 1500 Hz square wave Do you have any other components connected to it ? A small inductor in parallel with the piezo, for resonance, will increase loudness. So will a resistor, to a lesser extent. For example the beeper in a watch is often a disc piezo + inductor. Without R or L the sound is quite weak Attached are a couple of circuits I use (although 50V is pushing it a little) wbr ------=_NextPart_000_04C6_01CAB52C.E4392820 Content-Type: image/gif; name="piezo_drive.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="piezo_drive.gif" R0lGODlh1wCWAIAAAAAAAP///ywAAAAA1wCWAEAC/oyPqcvtD6OctNqLs948AfUZYUeW5omm3ai2 7gvHCCuL9Y3nC13z+g8DCA9CH8cYKY6KRBGNpQwxnQHpBwnM5rAQZPQ7tHC1ZKK0iral1esZ+D0Z n+TluhW9XNNnm73JXxc41+fRBOgwVcjXlHa1KAjZcPiIMxl5KaZhmbGJ6Rn3GSr6sHTYOapyxtjm lNgIwhTWlkfK6iiJ9cValXjLe4rxpLiKKggM6ZustyuJ5+w4Bv3snDQtfYwoQ8t2Z6tKDa68d23d VS5dTY7OTVmBnSVuKN81FFt//6b0u2+fH8WPb1+xgQQLGjxIZhszYggbOnznMOIPiBQoSjS4Sday /lfDbM2jpvFiiXivVNHp5C+kGx8pLYrkE8aKzJgqW7jM9jIiyok5baLrVdNcsEK0KHoh+uvbwp4o MvJkilFTJagId964SRXnUqFQffWJ2c4dLKVQYoBlKqwd1p6uPOgzUyqtwKlqO9K7ErDtjrwBk/DF i1VvQZLhtiJVZ/jctHSKyw6btPYfs7Iq8cL8SNgcYq8MNoOr5XltYlGEM2c9jTq16tXBYtllDfvI x6RgYtv+czv3IN28j7T8DVxXb51PhzcU3cz48aEMGfFwfAG58h0rNipl49FGHoXTCwM+87aaDum2 t88Dr+ak1KvdJQALLpi63/ft5T8Lv42le1Ds/uu/xkTef/41R8IpAcZXn3nOrRedfTc9JwuCswxY C4PcPGhfehpCR2GGYhXXYRAW9hAiiZxUEmCJVplYojYjitiiNvDNSCNwMbp4o0TKjCZgjlFpx99L cmHHI3WUhUcgZwp69Z1LCDpWFCzs0MXQkPsRc11YVcpDFpGaIeWWVp+BQNtG/W2ppX9n5VTaMimy 5eVgbmJWZGiJ2amenS5EhiWRkM0JZKCMeQZaY/vpCZeSmbzAoaDb1bNKmwoOqlihhH556WNF9gjE UWROalo2iDYzqqiG7kkcqIBSipillWL6aiqp0jmpj7beimuuuu7K66J+9tpVLwQCy+ZsKxF7/lxI uSAL25vMauHss51Kq1pQ1AoZbbTMaqststxeyyKV4DIK4rg2cSIhZxMyZ66HQR5L25AQfnNHt8MZ SK+GHcnVZrvuXumovpTw28gt1t6m6m5bXLumZeAZDLC40pKEHkdcNdiZFzVZa28xQJkUaJadvUiu v+KxS8rBEZss65kUgrWjwCwF965ZKnLpYJIri2lziJYVPJNM4ZrV8SgW0bgzjjGqK9uJC7cIqdCt YEwyqjeHzN2HKLs8YL2rmrI1FXFqUhmdIw/r84u1jnS2IRAL5yN9kW6aNMElpZm204+IPOI/fm+I d4eW2Fu0cSsSXbhyh3PNs7dVl5w0sIvD/lgRw4+3XDm1k0Nes+N6K905sZtbnfnEg6uscOiSJ475 s6y3vi1V6xieteoivW6MsSezXMbaFfIeSJR7ob1cXYHn3GhFBHMoHaR7ufIxdBKeazzxoEkWp37L Aw39xdYfTBmZYNbOeXbWty1924ka8dPebmGf3/rpXkaqzE+jef77zmuHJFdSV8y/6WlpZmLKl0Ly JTEr4e4T+4NT9caWIPItR1W+W5qQvraqWwmQNBis4MhKZaRTwapVTdkg2YJmvspRUHf1y9QHRegq EsKOelMqyXN4QT/vsPCFLgxhD3kYqxQ0ry7xc1/AVngoGAJRhqZyYaPARrrsucFPBqTVbQ59GEQs MrGFscJP/sSXO/VZ8YigAOGnlMjFLbJjcLMio6BGWI4YxhGO5IDXF/9FEEld8Yw/PEwWlzjHGcoJ iWNq4h/9qEYtBlKIbdThG+VYR0Mmko+HPCEcPNYPfGgSMBqEG/AOYsJPilIDBQAAOw== ------=_NextPart_000_04C6_01CAB52C.E4392820 Content-Type: image/gif; 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