Regards to all can someone help me to make circuit with lm317 and transistor led police lights i plan to use 1w led 350ma i have code here void setup() { // initialize the digital pin as an output. pinMode(13, OUTPUT); pinMode(12, OUTPUT); pinMode(11, OUTPUT); pinMode(10, OUTPUT); pinMode(…

What's the LM317 to do? 5V regulator for power to the LEDs?

You've got the current limiter part - now put an NPN transistor in series with the LED cathode. A high into the base from arduino will let current from collector (connected to cathode) to emitter (connected to Gnd). [LEDcurrentRegulator.jpg]

Help to make circuit lm317 and transistor led police lights

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system December 18, 2013, 12:18am 3

lm317 as a current limiter

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Help to make circuit lm317 and transistor led police lights

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