You could, therefore, cut out a few discrete components and make some of the connectors shorter, but I don't think it would be worth it :-) Components The circuit schematic and main circuit board as described here could cope with four hot plates, as there are outputs for four solid state relays (SSRs) and inputs for four thermocouples, however, only two hotplates, SSRs and thermocouples are utilised in this version. Here's what you'll need to get this project made as you can see it in my YouTube video (which you can find here, along with a teardown video which you can find here). The profiles are not currently editable through the user interface, instead needing to be set up in the the C++ code, but adding user updateable profiles could be achieved if you know what you're doing and can implement some sort of storage for the profile data. The unit supports multiple temperature profiles for different types of solder and can be run either in solder profile mode, where the hotplates heat up and cool down as specified in the user-programmable solder temperature profiles, or in constant mode, where a target temperature and heating period can be selected by the user. In this guise it utilises two 400W 240V heater plates, which can be used together to solder PCBs up to 105mm x 120mm, or with two additional hotplates and a reworked case, plus some minor tweaks to the software configuration, it could support boards up to 220mm x 125mm. Here is my attempt at an SMD Solder Reflow station. Once you've built this device DO NOT LEAVE IT UNATTENDED WHEN IT IS IN USE! ![]() If you do not have the experience, knowledge, skills and tools to work with these challenges safely, then please do not try to implement this project! WARNING: This project utilises mains level voltages (240VC AC), high currents (5 amps) and high temperatures (up to 220 degrees C).
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