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FPGA driven reflow oven

Almost every electronics now have SMD parts on it. Hobbyist sector is no exception. Sometimes parts only come in SMT packages and there is no way to avoid. If you need to solder few of them, maybe you can get away with soldering iron and a bit patience. But for larger batches maybe it is better to use reflow soldering technique. This is nothing more than baking circuits in oven. One thing is important here – temperature and timing. Instead of doing this manually, better leave this process to control circuit.

fpga_reflow_oven

Hamster though it would be fun project to make an oven controlled by FPGA. He programmed temperature stages as finite state machine. Temperature is monitored by using thermocouple. Heater element is switched on/off with solid state relay. The other part of electronics is less critical like LED display, RS232 logging. As initial tests showed, good oven isn’t enough. Proper paste dispenser is also critical for smooth solder joints. But with some practice or by simply using stencils results sould be much better.

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