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Wireless Communication Answered

I want to make some small cheap (possibly from toys) walkie talkies it would also be handy if i could attach some headphones(with inbuilt [eg iphone headphones] or seperate mic)

im hopeing to have signel ~100-500m but anything will do.

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Search on Google.  I found simple transmitter instructions on http://sci-toys.com/scitoys/scitoys/radio/am_transmitter.html