--_003_D0B8EB0928DB4EAB904BAAA3DE9B0479ivp1_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Attached is what I've got around to making. Components are pretty much finalised. At this stage the LM317 can output any steady DC voltage from 1.9 - 32.5V, 32.5V amplitude AC or any combination of DC + AC to a maximum of 32.5V The PIC and summing amp make a stepped sine wave from about 0.3Hz to 10Hz (my desired range), as set by the pot. A motorised pot sets the DC Level, but this could also be PIC-derived. After filtering, the shape is pretty good at the higher frequencies, a little lumpy at the lower This 'swell' voltage passes through to a second summer so that the DC component can be added, and then on to the LM317 The LED indicates only frequency, not amplitude Joe --_003_D0B8EB0928DB4EAB904BAAA3DE9B0479ivp1_ Content-Type: image/gif; name="swell.gif" Content-Description: swell.gif Content-Disposition: attachment; filename="swell.gif"; size=6776; creation-date="Tue, 19 Apr 2011 20:31:55 GMT"; modification-date="Tue, 19 Apr 2011 20:31:55 GMT" Content-Transfer-Encoding: base64 R0lGODlh7AKTAYAAAAAAAP///ywAAAAA7AKTAQAC/oyPqcvtD6OctNqLs968+w+G4kiW5omm6sq2 7gvH8kzX9o3n+s73/g8MCofEovGITCqXzKbzCY1Kp9Sq9YrNarfcrvcLDovH5LL5jE6r1+y2+w2P VwB0QMCOwMv3/L7//6N3lyAIaHiImKiIUTho0LgYKTlJKVenh1mpucnZOZYJ6Sk6SlpKBGqaqrrK 6pJ5ENoqO0tb+1BHaKu7y9vr+wscLDxMXGx8jJysvHxx6UyX8Sw9TV1tfY2NzbzNzYnLESsV3k1e zjc+gf6kbt7ujsYOEc80/25/z1XfoJ/Ej/8PEIo/BQONFAyIMOEpDwcXKnwIUSDDLQ0jWrwIo6Kj 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