How to solder double‑sided PCBs using a hot plate

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Wrap a cardboard box with oven‑grade aluminum foil to make a heat‑reflective lid. Place it over the double‑sided PCBA, and your hot plate will become a reflow soldering setup with amazing soldering performance. ......

  Place a scrap PCB underneath the PCBA, because the aluminum surface of the hot‑plate gets too hot for plastic connectors to withstand.