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[–]unbracketed 2 points3 points  (0 children)

As a relative newbie to electronics and digital circuits the focus of my learning has been around the theme of "driving many RGB LEDs with minimal hardware". Going from fading an LED with Arduino to more complex projects has meant looking at people's projects and schematics and trying to work backward through understanding the "why's" of the circuit designs. This looks like it will fill in some parts where my understanding was a little hazy. Looking forward to grabbing a few quiet minutes and working through your examples in detail.

Thank you for providing this.

[–]ModernRonininterocitor 0 points1 point  (0 children)

I think the "Page 2" circuit can be done a lot better with just a single NPN and single base resistor. There's really no need for an emitter resistor in that circuit:

The only plausible reason for the emitter resistor is to reduce the power dissipation in the NPN. But unless you're supplying the LED with 15V or more, the power dissipation will be less than a quarter-watt. Which is safe for every TO-92 transistor I've ever seen.

Clever MOSFET circuit though, I like that one.