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Adjusting gain of first transistor costs nothing in parts, all you need is long enough wire and maybe one or two resistors from the drawer or junk radio.
Pin diode costs 20 US cents in my country, couldn't be much more expensive in America.
Mike

[QUOTE="sp5it, post: 430153, member: 10249"] Adjusting gain of first transistor costs nothing in parts, all you need is long enough wire and maybe one or two resistors from the drawer or junk radio. Pin diode costs 20 US cents in my country, couldn't be much more expensive in America. Mike [/QUOTE]

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