I have modify the ATX power supply unit from my old PC. That are 12V, 5V output, total over 20A. But my ATtiny PCB board only have 3 items: 3W LED, PIR sensor, BC337 transistor. I plug my board to power supply, after about 5 mins, it got quite hot. ( I did not measure the temperature, but I think t…

How to limit the current to my PCB board?

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