@inst-tech The TIP120 transistor actually works just fine. I started with building my test circuit exactly as outlined in the video. I only substitu...

@davee I mentioned 40mA because I'm using two red LEDs and remember hearing that each LED used about 20 mA. Since I'm running them through a single ...

@inst-tech Thank You, that explanation helps. The same circuit works if I replace the TIP120 with a BC548 which I have more of. I'm planning on runn...

@davee Thank you, things are starting to make sense. I'll have to take some time to work through your explanation to be sure I understand it. The ...

@dronebot-workshop Bill, Thank you, that video was very helpful. I have a prototype working as expected now. One think I'm still trying to understa...

@robotbuilder I get that I should have said current instead of voltage. I've been reading about transistors and watching youtube videos. I think I'm...

@inst-tech thank you, that looks useful. I'll take some time to study it.

@zander what I'm trying to do is make a Halloween display with several pairs of red LEDs to place in the bushes outside my door for next years trick-o...

@inst-tech Thank you, that looks interesting. It will take me a while to understand it and will probably have some questions. One thing I'm having t...

@zander What was puzzling my was the behavior of the LED. Using analogwrite to the output pin I expected the LED to gradually brighten as I increased...

@zander thanks, I've found some info on using resistors and capacitors to flatten out the pwm signal but not by using arduino code. I'll keep lookin...

@dronebot-workshop Yes, that video was very helpful. I've ordered some of the transistors and mosfets to try it out. thanks