We're handling some wireless LEDs - pretty amazing stuff. Again we're sponsored by https://www.PCBWay.com/?from=atomic

I saw these LEDs on the Tested channel originally (https://www.youtube.com/watch?v=QL7bwm_FqlA) and decided that I had to have some.

You can buy them here from Aliexpress (affiliate link): https://s.click.aliexpress.com/e/_A4gUEH

If you want to make your own LEDs then a 2.2mH inductor and 220pF capacitor seem to work well - you can see how to do it here: https://www.youtube.com/watch?v=jdc_0r5pJPc

The mystery chip has been identified - it's a XKT-001 and it's actually controlling XKT-333.

आदित्य Aditya मेहेंदळे Mehendale points out:

The XKT333 looks suspiciously like a MOSFET. I suspect that the 6/7 pin chip is/are the "brains" and the XKT333's gate (pin 8) is driven by pin2 of this other chip with a square-wave. The duty cycle of the square wave is likely 44% - hence "2.2VDC" (average) on this pin.

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