This is a multi-part message in MIME format. ------=_NextPart_000_004B_01C06FED.B3F6C480 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 8bit The short answer is YES I have used toaster ovens for reflow soldering. I can't find my notes on this, so some of this is from memory. (Gonna save this message this time) I used either a Toastmaster Model 316 or 317 toaster oven or Toastmaster model 7091 or 7093 convection oven. The convection oven will probably give you the best results, but it retails for about $120. The toaster oven retails for about $30. The critical thing is to get the parts to change temperature on a predictable curve. You must slowly ( 5 minutes) raise the temperature of the part until it reaches 215C/419F. This is about as high as the oven will go anyway and about as fast as it will heat anyway, so this is an easy profile to hit. I used to set the oven at 100C/212F, set the part in there and get it warm for a few minutes, then crank the temperature all the way up. As soon as the thermostat cycles (you can tell this by measuring amps drawn by the oven) you've reached the proper peak temperature so open the door and shut off the oven. You don't want the parts to remain in the oven very long at all, yet you do not want to disturb them while they are molten. They can cool rapidly after peak temperature is reached. A better way is to attach a temperature sensor like a thermocouple directly to the board, and watch the board temperature. Aim for 1 minute at 215C/419F, then cool it down. If you don't have a thermocouple or some other lightweight accurate thermometer, then don't worry about this method. Another prototype method is to get a hot air rework gun. I've heard people say this is a very effective way of doing one-off surface mount. I have tried a heat gun not made for the purpose, and ended up torching the boards, so don't try this without the proper tools. Here is a good app note on surface mount soldering in general: http://www.minicircuits.com/appnote/appnote0-42.htm You'll need paste solder and paste flux, as well as some syringes to apply it. I use solder from a kit I bought through Digikey. The link is dead on their website so you'll have to call them at 1-800-344-4539. I had to practice several times on scrap boards before I got it right. ----- Original Message ----- From: "Alexandre N. Guimarces" To: "Lawrence Lile" Sent: Friday, December 22, 2000 11:31 PM Subject: Re: Re: [PIC]: Sssssssssmokin' - Do you solder SMD inside toaster ovens ??? > Hi, Lawrence > > Nice to see that you are making progress. The cascode configuration > makes the transistor behave almost like a photodiode with much higher > gain... > > Changing the subject completely... Are you the guy that uses regular > toaster ovens to solder prototype SMD boards ????? I am desperately needing > a solution for prototypes and small runs and have not found anything > concrete about it. Can you give some hints and oven models that give good > results ? How do you control the temperature ? > > Best regards, > Alexandre Guimaraes > alexg@iis.com.br > > ----- Original Message ----- > From: "Lawrence Lile" > To: > Sent: Thursday, December 21, 2000 7:30 PM > Subject: Re: [PIC]: Sssssssssmokin' > > > > I've finally got something that is working halfway well. Thanks to all > who > > provided suggestions.! > > > > Here is the suggestion that really turned the tide: > > > > Use a phototransistor in a cascode arrangement: This speeds up the > sluggish > > phototransistor so that it can see fast pulses. Apparently casocde > > arrangements cancel the Miller capacitance, allowing the phototransistor > to > > operate quickly. > > > > Without the cascode amplifier, the phototransistor couldn't see fast light > > pulses. > > > > Attached is a diagram of the whole thing as it stands today. Now my task > is > > implementing the same thing with half as many parts. > > > > -- Lawrence Lile > > Sr. Project Engineer > > Salton inc. Toastmaster Div. > > 573-446-5661 Voice > > 573-446-5676 Fax > > > ------=_NextPart_000_004B_01C06FED.B3F6C480 Content-Type: application/octet-stream; name="surface mount reflow profile.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="surface mount reflow profile.gif" R0lGODlhWAGzAIAAAAAAAP///yH5BAkAAAEALAAAAABYAbMAQAL/jI+py+0Po5y02ouz3rz7bwHg SJbmiaakqG5sC8fyTC/Afb61pO/+D0Tdeq5VEEI8KpeyIfOQxESZ06fV6rxeolWeEdTVijXZcawb bqQponZg7YCbgWWxnO6t3COsaR/31jMEOLezZ1docAd3+DDYmACZmMc2idAH9ZapqdjJ6SlpI4U0 FzppGnmJ8+LGmjkYiMrg6vZp66q5uskR6vdlmyEbVJeC2VmrQ0QYyBxb61kJjLv6Z+y8C6sYJqtc gqYNlSSssoyXew58+4o8y6nrLq4Kqs1KO0sckvOLOs4bR3UMnTVwoFrpwwaoTT12AcsFOwgG36gm Dy9Z3IRpXLWB/tCOPWuR7BXBjvEadvzkC9qzlelSmenXsoMgjBfRCVR3cpclmBBRolTIcOaIRzJD 8CQlj9oyezEnHC12SpUxXLHCEerHhSafqDWp3qw60qklnS97ahnI0p1WraaebhmbE5EJtx7qYQvo c5rJu0wdwv0LeOvLR4QLGz6MOLHixYwbO34MObLkyZQrPw6MObPmzZw7e/4Mmo/l0aRLmz6NOrXq 1KVCu35Ng25R2LThZnM0t3Xt3TAkChnqDUnGnLJ5J/Kt2x9wMMYzIwedsuKY4s3V+K0uFvfbGe/m ucQu/S/12ZQEMz8P3rrrhVYRLgSKdbt29HXBX88+lupGeE6m/9L7IEkVMHkV3mdujUdfWcp9V9dt kbDDUVPJ1YAggFzVR9YVFUZzlngX/hIRNz/cp4Ag/V2UFnk7fbjceSIK8aJVCfWXxTT7gSWKbR+W weOM1w1oFHEqmmVOfjv2aI1eNVnYTF74/TMMQDoet+RwCq2VIRYsFrkilbkpeM1/YiZTo3fpndkh mET5hJdUGOn35lQbolnbnHTeiWeeelbJjI927glooIKm9+eghiao4aGKBlZoeYs+Wkij5kFKKRvl kEjGhJVC+tx8iGq56Z6dFtGiXKHyNio5ny5owx/h5HjqZqkeEeOq3jG0ZKx2YGokq2nq6sOsHraT 6VAOFgissf+SBgvlRNMlGwyvZ27jbIOvkgrtg9JS5KWnTxZlELabCqvEso42ey5IFkVobintImvq pEiFWCug72IYaT7yJqonI8PipNatKJb6LbG2VovdtiX+qymHBgN4LMJ1YsjUOXCGJGGxfaLVFTgf 4SsfrBAr7C10PLE3ZlXZwBIhyGDCm/F29cqqrpMc36USSbkKVnGS8xDIJsAPa5zlE/eGfAY9LNXI dEjI0OizeUiKhJZS+kENdFwIn4zbcLdEPJ2k/vEHH2Ff4YhzNWrkPDbHQs2MLddMhg3qxhlibHHU FuciJ6xNt522n+ISTB4/WJRUrsA/0dQ2yeV55fXZuA5+sLP+hkc5L62vXiWwf93F515QCbUXsK+V a06hvjphnHWxK99WZssHrakkyw6d6JGf0YGI7+Xk9CJlxXzxze3Pe+es815CNUVgzxkDqbUeRA6u JNsikfXNlPl+SW/2pRe9xYFS9rq99UqDdeXOpsdBjcjSF2/+d5Mj3W3Dc8ebeWyptFKHz+QyuKV4 eW2AAIzZ+xZWwKE9aAnLi1xQcFaw8tnPZUNS4Nrql7KfXQVqquuSBAlXtwkagmEvA6HRtMWmnsVO dg7DHPlEuL4TZmuGvUkOUZZ2vhSODm84/B8N1wPDHwqRckMsohGPiMQk9mtdWFKiEydkkBs9cYpU rKIVr4j/xSwa8WhaRFUQu7jFL4JxiFxM4BiRWEb1nfGIaQTfGskoxjfCpkzcw58c54ico7QxenfE jA/l9qw+Osdx7qNgCAUZKULuK4bjQ6SGFEk/IsrQkbSCZAWJ9itKcseSvJNktHxoQU2ugJOqMiQj XXU2Z+yRjKTU3yUZiZf5GVCU7GulCzFpymtssJC0tI4tDykxYPZSTJ7Jiic/actV2uuXgeRlC18J szWC0jno6mAug6nFaRazZBF0AdisaUVtvsZ74BQmGpk5zvx1s0BtSaI4T8fARarTm9fCJbDe+RsM XvCZRQiXPSuFTqjoM5TVVE7L1NYkNR4qoEkbKEEfOrux/ilUUMosqB0tus+R+YKAZrQXZyo6Szd2 tCJw6xdI5cmvdSIQnvzE00lVOkmYijSS/5xWunTjvBQmD3QHxGgj0USyl5IkarXzUSdvOlFsRtM4 hxDqT1Cmsg2+g6flTGr48BlS6NS0mXF05kyrulQgLmhqNnmd1bhXPYB57qsobesqnSoFYUCOasNr 4tzah76OEQ8o10TpW3cDPeel6CMsjJtAOKhT/twPm9DLaka1WscAZpKxo/wlXB1BFynO1U2Bm+o3 DUZWHSYJa/AJk0/52VjffbSGYZrc8jZ3Mz4Sq4EeW6uQhorUnsoWddTkjkqiyCfrxdaxpUtLuHi4 0s0+/xaTc0JlQtl6Fjs59WjGHBIg28FRq07WleSj441WJo8chrWn1xVFdqGbONTxlV0dk6jTFOeX zQLueis9pnzKa994Bk8p4kVu+vh6vf+GZS0PLK5NtNvW/N7ycL+6GufqClUnKRaiP2XpiLYbU67c EHcIRVlhWwpN6aiWt/XF3HrhGzAHlgpyrmXbx8YL4wOOOFjkNDF/v9ekjPCPqnP9nIHTB0sFyzjE rJ0ns5C3OOOlmKEgfcpfR9hCvKWYuKe9KIb7SuLeNBWFOGkdSek7vA+vOMBBUy7naPuw0NJxuWMl sgkdRaazellftADviYBcM/MthWnyO6zg9klb4XkVmf5YdnOCfdta2O1wt/TxX0FuzNmn6i259MVh le9r6BjDGUuCbVPQRmrllB41w9YimKJ9LDxFs7mrtzz1lHHcKBoNmqbWjVNpifnnPJKQqyo8XncY rVvMfm9NWy10Q1/4MsECGc9UxmynUNmNTxbZxbpDslK5WkILyzTYuY1s+xAnS26zmktv1u+2vX08 lwC32FcWNUf9yd6j4q7b9YRyepHN61wn2bQ8fTCCqZXlvGrwPWijt6iTPbA6ExzY3Yy2kZttFjiR WWggxrbFF3tKf3NzsnrpC5IXsetQB/naWW1yhT94cWNf2KH29uC4K35vV5vpu0rj5LumK9lMrzyh 1XJLkccYvuqW59ycOj/ye2f+aeJBfJgsNzfT72lDYjsYqjyS0dP69nSRx/zokkusPyW818v28ck8 V8vXvQ7vSvNN7Hcke9Zj5fa3h4rtcq+73e+O97zrfe9dNJtxscr3MK6jGXQPPG3eG27DK37xjP9h AQAAOw== ------=_NextPart_000_004B_01C06FED.B3F6C480-- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu