Trashy disco light gets even trashier (with schematic)

I spotted a video by Franlab about one of these, and it reminded me I have the latest incarnation of these lights that has a more cost-optimised power supply than Fran's unit.
I've featured a few different versions of these in previous videos, but this one has a radically different approach to its power circuitry.

This unit uses an onboard three terminal 5V buck regulator with a useful cheat to nudge the output voltage higher with a zener in the voltage feedback path. That could allow for this same circuit to be used for many custom voltages.

The regulator chip is a KW10L which only seems to bring up sales links on Google. It's almost certain that it's a pin-compatible rip off of a prominent branded version.

Other hacks you can do to this light:-
Wire the motor across the red LED for slightly lower speed at 2V.
Disconnect the motor for a static effect.
Replace the LEDs with a colour of your choice, noting that using three gallium nitride colours may need a resistor adjustment.
Add your own custom rotating lens plate, noting that the PCB is fully referenced to the mains supply.


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