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How do you use a transistor in place of a switch/button?

http://www.kpsec.freeuk.com/index.htm

Here ya go!

Now how do you use a transistor in place of a switch/button?

So I can use this with my Basic Stamp 2?

http://www.makershed.com/ProductDetails.asp?ProductCode=MKAD4

 

Admin Edit: Changed post title and removed useless posts.