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cosmicray

Member Since: July 13, 2014

Country: United States

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white-hat, from the days of MITS, SWTPC, and punch cards ;)

  • An off the wall thought about methods of gaining appropriate heat for reflowing. A few years back, I purchased a small NSF rated convection oven. It is one of those stainless steel models, that can handle a ¼ size cooking sheet. My original intention was to use it to make small pizzas. In the process, I learned about cooking stones. I was unable to find any in my needed size, but the local building supply store had a selection of odd/ends of floor tiles. From these I found a few unglazed ceramic tiles. The unglazed tiles worked perfectly in the convection oven, and helped to moderate the heat (because the tiles operate as a heat reservoir). Prior to putting the tiles in, I could barely get the oven up to the calibrated maximum of 450F. With the tiles, I could hit 500F with no problem. This little oven cost me $400 from a restaurant supply store. Might be an intermediate solution (better than the skillet, but less than the big reflow oven). The oven is made by Wisco Industries.

  • I’m required to file a flight plan for this thing ?

  • Looking at the schematic, there is a D1 shunt that appears to drop 0.05V at 1A. But it’s in parallel with R2, which is only marked DNP. I’m not at all clear what DNP is about. If you wanted to measure more than 1A, the simple solution is to shunt the majority of the current externally, knowing the ratio between the two paths, and multiplying each 1A count by that ratio. The ohms value of the shunt would be very low, something that might be crafted with a carefully cut piece of heavy wire.

  • The Hookup Guide for the Pro Micro says that the maximum supply voltage is 12V (on RAW), while the schematic (rev 1.3) says 16V. Which is it ? (and this is important, as I want to power one from a 12V storage battery which will vary between 12.0V and 13.8V)

No public wish lists :(