Yeah, I do have some. It has been a while since since then, so I cant remember exactly what details, but it mostly had to do with finding the right resistor to use. With the BTJ types, you need a base resistor, and part of the calculations require figuring out the gain or HFE (I think thats right... its been a while). What I ended up doing was build a test circuit with all the parts that I planned on using, and guessed for the base resistor. Then I measured, and changed the resistor, and measured again. I did this several times and it seemed that anywhere between 150 and 300 ohms was safe for a base resistor.
I found many graphs and stats on the datasheet, but I couldnt figure out what to use for gain. I cant find the datasheet, but the part is a 2n2222, in the sot23 package. I thought it was linked in this thread, but I cant find it.
I also have some mosfets. As I understand it, I dont need a resistor between the microcontroller and the gate, but I do want a resistor between the gate and source, and I think that it is there to help it switch off faster? I think I got some 5ks for the mosfets.
If you could help clear up how I should calculate the resistor values, that would be great.
Im still kind of unclear on how to figure out decoupling caps, but it seems like there are only a few values commonly used for that, and trial and error may be good enough.