

i have tested something like this for preheating XD https://www.amazon.de/FOHERE-3-Temperaturstufen-Lebensmittelgrad-Silikon-Wärmematte-3-Stunden-Automatik-Abschaltung-Lebensmittelwärmer/dp/B0DDQ1L7WN put pcb on it, max temp, wait 20 min, then use soldering iron and/or hot air











maybe dont care. hit all 3 of em. answer is: i have figured out that one of the 3 switches controls the bulb (or not)