Hello. I want to control some RGB LEDs using Arduino. Of course there is no a problem if I use one or two LEDs. But if the numer increases I need some solution to get more current than an Arduino PWM pin can handle.
I try using a H-Bridge L293 or an L298N (in this case, using more voltage: 12V). Its works fine, because just replicates the same PWM signal but using more voltage/current. The problem is that this chip is for another propouse, having 4 input/output ports when I need just one, then, is ineffective and innecesarly expensive, specially in a proyect at big scale.
So, basiclly, I need a chip witch does the same than the L293 cheaper and simple.
Looking for a basic H-Bridge schematic, I can see they are made by 4 BJT transistors (in other ciruits, there are MOSFET instead of BJT transistors), so, I supose than using a couple of resistors and just one BJT transistor(NPN?) it will work, rigth? how would be this circuit?
Thanks you very much!
