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Topic: RGB led transistor current when mixing colours (Read 313 times) previous topic - next topic

bexx123

Hi

I was looking at a schematic for RGB led transistors ( image attatched ) and I was confused about what happens when multiple transistors are 'switched on'. Say for example 15mA is sent to the red pin and then the green pin is 'switched on', would 15mA also be sent to that pin? Would the 30mA total then damage the led?

Thanks

Grumpy_Mike

Quote
Say for example 15mA is sent to the red pin and then the green pin is 'switched on', would 15mA also be sent to that pin?
That doesn't make sense. You don't send current to a pin. There is a very small current that comes from the pin into the transistor, the transistor then switches so the LED current goes through the Transistor not the pin.

Those resistors are too low, make them somewhere between 1K and 10K. What limits the current from the LEDs? Is it a strip that contains a resistor? If not you will damage the LEDs.

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