USB fairy light controller teardown (Patreon)
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Fairy lights aren't just for Christmas, they're an all year round thing.
This is a set bought locally, that uses a fairly standard looking USB controller. It won't put much strain on a USB power supply at just 350mA, and has a slightly annoying timer function and no memory!
https://www.youtube.com/watch?v=uQJv9EcaKh4
The circuitry is pretty much what you'd expect these days. Complete with the polarity reversal for "effects". I should test my theory of the polarity reversal reducing corrosion effects from water ingress. Maybe I'll stick a short length of these outside, plus a bit off the same set with straight DC so only every second LED lights to see how they look after being outdoors in the rain for a while.