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I built one of these at an electronics fun class after a meeting of my local Ham Radio club when I was a teenager about 10 years ago. The one I built is pretty much identical to the schematic posted above. They're crude, but super fun to build / play with!
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Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime. - Mark Twain
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