Re: A few novice questions

Hi!

Please don't source half an ampere of current into an LED unless the spec allows that and you really need it. You may get 80% of the same brightness for a much lower current.

This saves energie and the innocent souls of LED's as well.


For bjt-transistors in switching-applications: Most often any transistor will do unless you exceed the ratings. Pick the cheapest one you can find. My personal favorite is the good old 2n3904/2n3906 pair. It can switch a good current, and it does a good linear amplification job as well.


Pick the cheapest transistor that meets your specification. If it turns out that an RF-type is cheapest give it a try. These aren't built for switching but they might do a good job at it as well.


BJT's aren't rocket science.


Nils





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