USB soldering pens have always been something of an anomaly to me. I have two and they’re not only impressive, they’re sometimes more reliable (for their portability) than my Weller units. In this teardown video by bigclive he not only examines the PCB powering his USB pen, but he reverse-engineers the schematic and explains it – and yes, (spoiler!) that’s a 555 at the heart of this circuit!
When I bought this I was very sceptical that anything powered from a USB port could actually produce enough heat to solder. But here it is, tested and reverse engineered for your viewing pleasure.
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