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Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

help me 2 choice one

You should be able to find info about all of those topics on the net. This is your project, so you are expected to do the research. Get googling.
 
I suggest you to take a look at the Google's search instructions description.
 

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