Hey everyone! I'm looking to set up four sets of USB-powered fairy light curtains, each with 300 LEDs, across my ceiling. These are the ones with delicate copper or silver wires soldered inline in an anti-parallel setup. I'm kind of stuck since these seem to be the only option available on Amazon Canada, and I really want to ensure they last a long time to avoid having to replace them constantly. I'm an RGBIC hobbyist, so I've done a bit of homework already.
I've read a lot of negative reviews mentioning weak connections in the controller, so my first plan is to resolder the wires and the USB connection, and then use hot glue to reinforce them. I'm using two 10,000 mAh power banks to power them since there aren't many outlets available, which I believe will also protect against surges.
One thing I noticed is that they only have a zero-ohm resistor and seem to depend on the resistance from the wires and LEDs. Is this typical for anti-parallel wiring, and does it pose any issues? I'm planning to run the lights dim to help with longevity.
Also, one reviewer mentioned that touching a wire led to a static shock that ruined their lights, and I'm concerned since I tend to get zapped in winter. Besides using a humidifier and discharging myself, is there anything else I can do? I have to unplug the power banks for charging. Finally, I'd love any ideas on bypassing the controller to avoid conflicts with remotes and keep the lights steady on, though I know the anti-parallel wiring complicates this. I've been considering using an H bridge for that. Thanks in advance for any insight!
2 Answers
You might want to look into commercial-grade fairy lights because they typically have sturdier wiring and build quality, though I’m not sure if USB versions exist. Yes, those cheaper options often break easily, and while they’re budget-friendly, they can be throwaway items after a while.
With the anti-parallel wiring, you can’t power all the LEDs at once with a DC source without some modding. The controller you mentioned converts DC to high-frequency AC. If you want to bypass it, you'd have to unsolder every other LED and flip them around. Just make sure to calculate the current needs and use a properly sized resistor to manage it, or else you might face other issues.
I get that, but I really need USB lights due to outlet limitations in my century-old building. I totally understand the trade-offs with cheaper lights, which is why I’m looking for ways to beef them up. I just wish there were better aftermarket controller options for the anti-parallel wiring.