--_003_703DD3154E6B465F8ECA386E4D6B7C00ivp1_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Forrest, Attached is a circuit I use to make a variable AC voltage. It's a binary-weighted DAC. The ADC pot changes the period of a timer, which in turn changes the data fetch time. Output is a fairly good sine wave, although data values can be altered to make any arbitrary wave. Filter components depend on the frequency range for best output, and a constant-amplification amplifier could be added to compensate for amplitude losses. My range of interest for this circuit is quite low, up to ~ 50Hz. The LM317 has fairly good current sourcing which could be buffered with a power transistor stage =20 Joe= --_003_703DD3154E6B465F8ECA386E4D6B7C00ivp1_ Content-Type: image/gif; name="swell.gif" Content-Description: swell.gif Content-Disposition: attachment; filename="swell.gif"; size=7027; creation-date="Tue, 15 Jan 2013 02:16:40 GMT"; modification-date="Tue, 15 Jan 2013 02:16:40 GMT" Content-Transfer-Encoding: base64 R0lGODlh7AKTAYAAAAAAAP///ywAAAAA7AKTAQAC/oyPqcvtD6OctNqLs968+w+G4kiW5omm6sq2 7gvH8kzX9o3n+s73/g8MCofEovGITCqXzKbzCY1Kp9Sq9YrNarfcrvcLDovH5LL5jE6r1+y2+w2P y+f0uv2Oz+v3/L7/DxgoOEhYaHiImKi4yNjo+AgZKTlJWWl5iZmpucnZ6fkJGio6agJgChCAiqBK 2ur6ysWamiALa3uLm1Q7a7Cb+wscjHPKWix8jJwsY+yr7PwMzcEcTV1t/WB80HzN3a18SustPk5e bn6Onq6+zt7u/t5ELG+aMW9/j5+vv8/PD/8PUAM4aVu2BTyIMFwHg1EYJnwI0KEEiU4oQry4ziK2 /oIYOyLU6ACkEpEeS3IjuQDlEZUmWz5juYqjy5noYGqTSTPnOJu9cOr8eY0nrywkswE9Gkqo0CAi 6fVECtWTUp8RUGVbGjVrn6lait7EqjWsHp5gfXjtVVasWjs20/I4O8vt2rlgiA1VuEGuDrhW6frl I8sX12UK7d5V0MwohasiBv59PKWWKsV58aZyjFZpsb5fQ6akbMMe5NFPDHM+XLnz06GgLzi9jNqq YNg9W894jZa07oq0b36uEJh1zLJ9OeN2ugt5bd8TU4LArU3v7uknilu+DB1CcMWnP1gPPJk5c+Pi N0pGjSF7dOrsgUxLHr2f6NXhVT+PG1s4XtkD/uUb/d/Pbwyo116BoSmXX2YgbdbfcI091Z1sq613 l23mhUNRcgwRaGCHZiG24IT40VdeehAqWNts0Fm4EWITaIiNdB7O6AFX5xkWXxEyDpjejjT+aMFS PtYw5HUvFglkkp55R9UKKHGoZJQqCNmkdggGWc82UErJpUA1VrnkiFj22MCWXZbyGmYonufSYFio RN5iAgmG5Jnj6Scemy25eQWcYr44p4B2xqBnguh1xKcVT+Y2Zpa01DkohYzG9x9NiVbB16FhOjpp pDAUGtNyln7ZVaN/NicNjp5+aiSJkL5EKhMasvgZOPUBupCZq44wzYTc6XTpSvuJ6OSusqaZ/mZm rZYUrBESFsaqsdISGusSVyaL67ItTsstC83qWN6t2h3WXVWvdludrojmUw9vIk4m3530BYguFLRS d24IyjGG5Y3m1luatoC1Wq6pw8yTmqy9Obaoi6gCrHCog4AqartEgYlCvhAzKfHE4yHXX3YNoviW utu+Ge3G1pYYCL/43RpcxQVTobG3Kas8kslj4Wldp67a1yfGLTZ88sg436bIae9d1+upmDqXI3Yg M7iXa+LKGeOdNR+9dala8/KrqPR0nTGIX0usdA5NgU3syc5VevXRNif9aHhTg7hZXGSXgmG4w97b wtp2G8zjz3t7pyZkhx80G8k4MqzzlMBB/ghXmMwsXu1umEcEtXB6pj0McHbN7HbhnmuqS4GbYyJP aJ03/XPbhLlWcbaWd7Z6lpFnJaN/vv8OvBmLN3462nimMCvLVZ2IddEI5p7a7j/1jgT0xTqI3Xqg h4wszB3neWXU2c8t76vW02B314AHQ72wmStrJdV1Y2Wa9/AWL2baYSsssuxlr+Ey6T1nfcBon7Nq BB//xY5cvNrP6OzDn7EBrXaoI0L42GY75ZXOYQKrCLYkFTj9nG9g1aneQgxlkUK55XN/myDsKDjC cflKgy7y12KgVC7SPc1sVkvc8ijoDAOC632A6x+l9DUssRlHfxAsUQy3xZ14kWhewGvd/hRZU8Us alGL4fIT7XwGqxK674R4S+H3zuiljkEObEv03viI9cSQ1Idiy7NhjDLEQC0J8IZ6aY30iKbDYwjR ghwz3RuTaMibJYyGhJzaBTOowA4SbIMN5JsVH9W8RgXyBuC5Whyvx7cxEgSRpovb8RRpMUkG7AWD LIF0aKUuL2KwBx/MIRtaKQQq+caHeFPQHPc4hE+mMoRi/J8rGQlGVQascQT0Ai6Z0glhmoiVxiwm CYqiJWdCrZldeKZ7oim0AT3yYcdEnr4+GCTiQbKCobPMJsfgzR9I82Jey9Y7E1nJao5ylmTykh3l yTR2iiGeH+LEPAkHRX7+MJT6XGQk/ifCxSsyiF03UycAG5pLcNbzSIObnDUZmit0Wq1MJrOlQ841 0Zi1gaCdexf8qCjBTGbioB61Z29kms+PJsyUEJXhOiVCU3hi1G3IEmECQ7QMYO6Qnja9pzLTONRp KrSnC41qUqyayKI66Kg1peZDtbnRhfYMpw+SXKx4SlKyXvMWSvVpBr8DQhaq1ZxoHKi73JnOOXZ1 raBMFQF3NyT1tbWbW6SXTOFqvMRytLBVfGpYU4dJZPLVXAaxaJlW0T3Z9VFqdJIqVs0q0DMMdlPk fBkDZyjZupKULI5l6sr2pVqdllKcLU3rAmf2JCna1rOyJWZqy8BSDjIPdBWKbW2r/rpTNQSVUftD 7leFe7ul+VJV2MNfnEJ7XHyCkLcgVeRyQVtOPsb0lyqtEHW1S8kefReJ8ZDXc0/l1O1eVma/fV0T iftFt8qXu+GllnHRENwdrC0R360Upfbh3pRS1KfEZQncvkLH0s53v8PsrW/XS9fuBhOhHouHG99b XSAKKqEGlmrTxgri/86rrBm+zWjDScYD7rUQBb5peclqRrGysb4cPLHTKueZF7cWquhjy2ffwmFB YDi9Fu5lbgA0H0NCTq9DztBmwbtIXqLXDQGu2owJsWTS9nWyR4auf7Hcz1OKGQ5dVluSWwZjMsu5 v3P1LZonV2L9xqHN7awzIMI8/uGqGk3CLNbwOr2aF1sFGqp/NXKTC+rnPwB6yzzEH6HZa+hDu4C1 ytOlUZl8yzJ7OdJ+mHR23+a30PKZv5fe9D6Zl+KEnohDe+tkrOmcU0J+ucOuZXCDcpzpQpO6xert 6K1vB2v1kK2W2BV1hTe8ayXHOcE31bOwcd1qOxPEiJW2HcMiy+NjPrjZc752RqMN58ci27TZfl+5 nYtKfxqKZIXEbGq1fFbcEcnZfdZ0unsta3bDG9OPXvSZU4nijzH2Hl0UKDdrejnXFRzJ6P6zxDE7 TieK1HlUtjbBgw3qMasX1mjDd347y2CGShdp6Vq4y3Xrb4vvW42ok6v5+P3s/nZr18Hko3C7Lmnv OxZz5bNb2cwRoT4jPQtDbrz5xGMsOjz3jdW5Du+Gsnlsco6sZstNOoEvHte4wZbk1gZy1d8dP/9Q e7oIJrbK/9VjMnQd7IbwOg9B42PsmjTqT3/1DX8+dTeLHO7uDcPc6Q5mxFc3gfljOz7WztkFD/Dx iKP8wH9KS1du/EgYN/Tw2stJpNN9O2I3NlqDHHg5yh2smD494Uv4z6OPJPSiJ1L99qUi+ZGbZcBu DMJ49fuYRyafrofoyxku0QNHGeTQLnLnSw4vk69e3W5nfSYHTfHWZz2Z0jdR7M18dhmzPMH2U7Hh p23uyWfsj+k8G6TPmfHX/oO/3sjc0eGLvs1ZRojL6P/4F0I0bqvzSrdmJphjf6A3fg5zXRFkau5G M/HWTSenb5nHYsUHbiGHaMx3bs4HLfo3VcrVf/chVJoEYQAFfH+lEQZYfeLHgTDFRNsHcEulbf8n gcuROz7CgCOmcxmIbSzIgczURPxHfTg3fBA3gdnnV5ZHW/nVbz04REcHdPJzY2nQgEPmgNYnaM9D gVA3f7BBNE2IdrrWgnUXgvSHgOOTGBF4heixeZeHf04ohm9IhkPYd7k0blboLJL3ZpIRYR6XgHDY fAdXezG4giYUgOFGhZZjWTtoKthHaWYoSoI4h4RIhCZ4Og9nLcGXcyX4/ogGlyrut2bp94R/SGNl uIYm5Cp9KAeVtSFU531nU1mFGIdymHh0qIHiR3S7l4nf4oahmFw2iIHiI3zQJHt1d3zHeHwQOHuG 04Vs5lDDSIIp4odxN2yWSIpcEma2NlVVCIjT6IuMdoSdeGqe6IOSiI3AlQdNoYffiHDhOI5LWG3i +E3F2CXc6I3v91IwiHWuVmhbx46Fs3TyaI20KCX2+I+Zp1JTGG25BXS9qIxLkjcCiY/mWJB2lToW kjxGhVZOJ3g6Ri6LqDt8iFTPZ36VyB4GSY7QhJEtRF/72ENM6G4pyEe8p4r3BnnjkpB4KIpKgpIp CWkbOT8d1Tou2XMn/vR94iRLfFh/eDRB84dfzViU9Th9OmIaiwYfnuSTtxiUwVdiyPg4v9GKTCli dfWUOul/5ziCs/hhp8UzTYmIXOiQMKSLgNKQyQSVeaIpDeky7xiVaGmRaimMnJWP2kiUgxeMbDh0 WXOQxdWKZXR6dmcnPSmRIMiDcVl0QFWYs3VFTtSBbHmNFZmWd8CR0EiRiqlM1NV9bJk4kHkmksmX bzCajOgkbSh/0MOaUhmajsaP1ZhhFqh6TCFkmxglrnmXQribpElMZOGVy8mcMNea/7eOsNmc0XmY yZloqyU3pgiaHQknJ5Wd2ulhdSlIo6aLsfSdtrgqh1OT3XaP53mG/tBJnFjoYo64W8jpnqgIMLYp mOxpn/dZjnsSUG+kJryoeYZFW1/on1IQn4eglE8WhPHoilqpR2+5oBBToaUYdNXGJvFVnSJYdus5 mQk6i23SN0rDVQQaht+jbBEqopCVE/5iS7sEg2/pdxNGayzaopFIolulmgcGl3f2No35ZjmKn6MS KqbXNigafvz5miFKpAPZJg+EQdxzHKfYjRWXlU86iugSmzUqm1o6j/n5kMaHfJYJpmFaL106pme6 gWm6pmSamjTKprQnppX5pnM6kdyiproDk3i6pd2yp8fpp3+qp3dqkoP6mdISqDOIqMRYp4JKaDzX qIQ6LeYDgKmH/qWT2pFuykq/A3meqqmByKWf4idHGap3xamQ+mUX+qSsag2LeqoX5Vb02R6wGquJ aJovZCC2equidSGx46qfwKsvNWUz2qubaqPuiDzBCQ3D6mO6eqzLGHABCVrBumd3ykK9Yq3uCVRf g1Ifga3FeonR+p6aKXDesq3OaKf29azpyq1Z2HHJ6a64uq4s2XgcSq5I6D7Uqg754p0tqaz5SqmW CDPzOpVdJa5pSFni448CW6Q7N58N16cFNFK3hZgOK6uXZarxFjnMagmC434LiLG3pA+fOp1t95HN YbARE433qmYja2QbG6ftyKRN+gqAdF8gCrPGaVwHKJ4F+A0m/nZfnrmzX2dMV7eYroCzAMt4RTuI b2clTnpVTJiwcOS0RluH8rWyRlevWcWwmQU/l7S1OZoW35ZmYaSquVp+AItaEHq1OrpPvlmfyQAp 2KQ9pIVfxva20lpJyslYBpW2OHmuGUobeTaXewuGIggTtGaem1C3tINYXmu4Y9uicoGJdlmSlGuo Z3khCRdQe2msiEuQr2a3Zqq5XauVR5ps1iVCxSm6W+ihKaYzvcc6mztcX6t7ZluSr0ueCESrOmi6 gIu6vCt3OGSzlfGzCJq0jTCsxEuDmgWScFqyv4mjoSttw+u8dTG0CjazzzWhz5ilkNC82RsLD0oc kaqkh8ug/rZLvkzVYDupovTTn3SDve1bvvRlvTaJucLpuo4QWNRpvzixRHIqj/xqpQSMoQE8CWsE ZZrIiB77W6cbuNfkwApMB5I6hsvLCBJswciaqbLIdjPVqRzcwWZ5m45ZpQtcwkpLZKOLcdwmvivc ChicqC8cvVgrw1NbvWWmu2O5vjksCjTswiSZsv4LxEHcwqVpZrq3wUeswxM7vMuHr//mxBq1w32X GCTMuVV8CUIcqUlscOfVxFxsxRVLl5hajVoMpMClaLtLxleMwv6QfI4HwP3LvCulom+ctRcodSG2 xSqcsYWnx75bpl+aXVemCQb7lfk7yH+sr12srk7TyCEl/sbt6cEfG8lTPMlrvCm/C4mVoMh4uckn yL/wCK2OHAkrO6CjLGB9XDyWK7yszFY1OLioHMOyPMsta8CxW7sAVMe4zKgpB4xX+giU273AzMnm 6rm2bMSRjMyX3MlamLqLoLlqnJ2EKbVDfMuw+cxoAooIDKnYd8y6ybPdfB+HyMhuBzuXOwfVbM5W d4SfFJYuNYnl/M6FFHFuTI88apbX6sz3jM/uKM8A2bS1yM0ArX3DrM8ZvM44jMcIHbsNu9AJuB3g 7M8HDdFKjIRDmSLjfMEXndET/MiY/H4eDcYhfajsS81mYbggjNLMnLiQjGQ3TMwv/aNQKtOwa9G8 adNe/orToKw2U1gn1oynA+24nLR/Ew3G2NzTJ52nQI0+zTXUgnLKTW3I+wzVhKJCPgp80PW+cmvV O22YlKC8C0LTaLIi1FjLYW3JMU3WZry/fMy9J7t8PSqNbP3Bbg3IclLRUavWm+ZDOanQeG2mdCrC VFtByialneq1zEjYV53BJB2N35usHszURM2lv6zVSrjXEHdeusLOKfrYulHWfAzZNT3a4mXSsyme klDacd3JROzSqa0457RTLb3HtC10wQTBe3CMZIRbwazbw8m4WWbaKT3cmuPXiG3HN53cPElVCHu8 B/zcHpKCI9mWfVndSaKO3ibbs73du3q2Pvp54e2X/nBdK3IM3uZ9kp9YwGPN3h2iGTYbWPE9nAN0 mmhdyPatOr6nv/zdqhSsauvX2gA+HX0klgZeuYpHygpu3Qzu4N95whEu4RBO4Vxj4ReuMhOu4TjD 4R2+MR8uRyuS1kMK4jsa2R55PGZ34sCS4YGmQ9E3RZ4cyx/VraXMex3qugz5rwWudL2N4pjn1EWT l6xb1eawnov7xRq840ILkf9V4uobFZfqx3+H2NlkRW0UU8KKe2A7kw7qhW2Jb0s3aDAi49zzfKt5 LYq25iQefTbX5UmtgFPqlqMBqtkdeeot3VheQ/QsFfH8ssl6P4MuNpE0dpK8Sy8YNvuj6EiaraJ8 /q/kNaDJAueYLcIbC49GuJnvu0BS0a7du9jbI3BCGqOaGeqYsZbParGP7itGI+qQTnaUYem9bIU8 XjeFkcJhOwqOLrR5F7mkTrT2KrIy2raKPrTG01ysW1xpripXAeS4iRErV5YQOcD3s+mK+YIEvWO/ pLrFvu3M9e3IDuvKrpDL/s1EOuvwdOgyHnWEHubXHmRSeEbjVRzuzlwiU1QSQub1fusr7mR54+Pd fkhnmu6/IJOtzNYFnwsH37tAzNQm3uKVe4d5HfHvis7zW/HX7K0Qn/H+CTfK2/HovvFQHPIJ+mAs XvIietkz9vApH6ow0uku36hXCYsyP6nEk4s2/u+njJfPOn/ziLTMPj+ngr3WQk/w7iTNRj/0Sj+y Cs/0/fr0TY8veWm87MiKeiSkZYSU2Ln1VslxYhaLR1RKlZyeB34otoFDrFjZpHTcCuRHOQ69hFtp aN+gI4a0/UwjTj8WEWRffc4jfO6NaaiwWfn2SWppaIyYfe33iT1vhVrb7/7XHZT1KXmjWUwgZM9L K9mz46j4rzPmeJ/3dl7nmk/49wiEG1T4Z69lNVnQSRT22qKzkSn6Y0n6jzj5O0f2hq/7jN/YXq+I q8/5Sg3dj7/lbL/53/j6r2/8L5v6RJn1/xpbuN22qfoYElTiZrvoopz9WU45e8kv2E+s3U/s/uDv 5x7oS6vr+uATQMLP3c9p9aB2+5IP/x2K3YUt5WUP7bY//+/P/6XP0wSAHFPP1rE9OWm1F2e9efcf DCuALM1ITNWVbd0XjuWZru0bz/Wd7/0fGBQOiUXjEZlUXk6k5RMalU6pVesVm9VuuV3vFxwWe0pj 89iAWqDKj3bgvXZCJu+44q5O2O+QOfxPruHE7a/PL+KQwTAQj1EPMbIwsXEvEFKS4WyTs9MTJk3C kG6NLtHhFFDUlBSvtVIzFjMWrpZ2r9W2VDPVlTf3VRfytBf39za4OFjVjRT2EzpaOtrJBFUYuFRZ W7fOd7V2lpWpm4JtBNt723Udt328nBuZ/luctX4aP1//ajAUfPGev3jf7gkLeEydIncKl5kDiO4d wllz3lHM5ofWxHN1Nu7z+BEkFGLeMpKM2PHfRWfzvqmU5bLbwXTNAIqj9AxePYE6Z9IcuOtnSKFD id4Y+a9iQ6AsjbUkaM1nU6BJYZZkOnDiNXVVdzqM2BNpUbFjyb7oF3Qmpo5qly5tNyzl26ZspWq1 6lblWrtdp4Itua5X1rtlCRc2zCRUo2J2eEFlHA5qzMZtHqeJnM4y5VGQNafKbNHY536eAXVeSaj0 ytQPX652PYj1a1mXQsdGexh3bt0bCtZFl6F31ba/MQS/GtWC8dvDHQLf/Rx6dBHKqWuo/u4ce3Hr 27OT656cu3Tx48mXN38efXr169m3d/8efnz58+nXt38ff379+/n39/8fwAAFHJDAAg08EMEEFVyQ wQYdfBDCCCWckMIKLbwQwww13JDDDj38EMQQRRyRxBJNPBHFFFVckcUWXXwRxhhlnJHGGhkUSBDf LEEpR9scuUmUR4IEcpJMenStR9SOVIiPZ/IY0sgfdcyEITZwshFLGnCca5GwmNnLL2wAywnMMSUq 86LFfOKLoOMCoyucNJ0RLE6mNlsuyzxTqIahOAtKDLyv2GxG0DDd4crQXA4KbkuTllODp0avGTMw PS0FpUubeJRjSowSBS0oUCNFtFAk/tcMtE/OZJL0KeL+/HTHS2Vt4SiS8PzqzK2OqxOtm2xC5NdE JWvuJOZU48mpllZ1qdJZnQ2hVi+bu1VYXke9Ci7ksFVKWVeZtWuqy5INdVwutx3s2XS5q+bUc2HN tU0zrY1KLm4Vzavce+00lzk6DdUjWHT5VU7dglWxzJc4NhpNKthe24zh2Bxu8jTHIC6NootRqwxj hys27aWNNb6MNJFLjmzhjiUeLFWDXaY1PO+0+444mW0Gj+Zpb64Z55lf/jmI63zeWeeeibb16JSM XprnposGGuqopZ6a6qqtvhrrrLXemuuuCbVVSbeuBBjpKvM1NdYiJwn4yLaNRRRK/q/l5oHVL5lt llNLgrS3S0/B7Avwt/1uM3BHODq83bkVn4FPWBplq9BzIAeXTDqzxeppeZCmHCHNPSd88dBdOIvt 23wtu1fOgbFcbUHUYrJXmVTv1F2CRb992rrLQfZdW0pPnXZxBa42W9ln35X3wnFfngx4wJWdKpWR S55a5YfXMezjqRec3F2Z/94k3TcN3F83aUeGdevDLPZv7k3P/Hrw5T8cYX53Z/nieUjLyDF0U5bN d/njGAD1EsCTUYZlCezJxK40PweaJWZMg5/SuLe9s71vcxWc4AM5qKUIOi2DG8QgBS9owfOZUDgd VOEKWdhCF74QhjGU4QxpWEMbLd4QhznU4Q552EMf/hCIQRTiEIlYRCMeEYlJVOISmdhEJz4RilGU 4hSpKLUCAAA7 --_003_703DD3154E6B465F8ECA386E4D6B7C00ivp1_ Content-Type: text/plain; name="ATT00001.txt" Content-Description: ATT00001.txt Content-Disposition: attachment; filename="ATT00001.txt"; size=208; creation-date="Tue, 15 Jan 2013 02:16:40 GMT"; modification-date="Tue, 15 Jan 2013 02:16:40 GMT" Content-Transfer-Encoding: base64 LS0gDQpodHRwOi8vd3d3LnBpY2xpc3QuY29tIFBJQy9TWCBGQVEgJiBsaXN0IGFyY2hpdmUNClZp ZXcvY2hhbmdlIHlvdXIgbWVtYmVyc2hpcCBvcHRpb25zIGF0DQpodHRwOi8vbWFpbG1hbi5taXQu ZWR1L21haWxtYW4vbGlzdGluZm8vcGljbGlzdA0K --_003_703DD3154E6B465F8ECA386E4D6B7C00ivp1_-- .