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Nintendo Switch Pro Controller - regulated & switched voltage source?

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Greendaycolt:
Hi all,

I’m trying to install some LEDs in my switch pro controller and am looking for a regulated (~3V) and switched (with controller on/off) power source. I’ve found a few regulated but not switched sources, having issues finding one that is switched.

Any advice is appreciated.

RDC:
Haven't gone poking around in there yet, but I can't imagine the voltage the sticks use is on all the time?

Greendaycolt:
Correct! But I am only getting 1.8V there, I need at least 3V for the LEDs I want to add.

RDC:
Use the switched 1.8v to turn an NPN Transistor or N Channel FET on/off to turn the Cathode side of your LEDs on/off. Wire the Anode side of the LEDs to any source in there high enough to drive the LEDs, with the correct current limiting Resistors on them first.

Greendaycolt:
Got it, great idea. I don’t have the NPNs on hand but I searched around for other power sources, found 4.2V in the center of the board in the red circle. I soldered an LED with current limiting resistor to it and it worked perfectly (obviously not switched without the NPN though. But now, the controller only works when plugged in via USB. No power on battery, even though the battery is fully charged. Is it possible I broke something here, or maybe just making a silly mistake putting the controller back together?

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