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Matt Bohnhoff (Mud)
New member
Username: Mud

Post Number: 2
Registered: 5-2006
Posted on Sunday, May 28, 2006 - 4:53 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Now that I have my crystal radio working (with a razor detector since I didn't feel like waiting till a germanium diode arrived in the mail), I've tried to build an earpiece to go with it. As described in the book, I wrapped thin enammeled wire around a nail 300 or so times and gave it a magnet bias at the end.
The earpiece responds when I run 1.5 volts through it but it won't respond when connected to my radio and I don't get a "click" when I touch the ends togeather as I do with my piezoelectric earpiece.
I assume that the problem is that the end of the nail is too far from the tympanum end of the can (another site said the core had to be within a few thousandths of an inch).
Would wrapping the nail more allow me to have the head of the nail farther away from the can?
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Troy (Pharoah)
Intermediate Member
Username: Pharoah

Post Number: 22
Registered: 3-2006
Posted on Wednesday, May 31, 2006 - 4:01 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

If you just want to get you radio working, you could probably find a crystal element that would work fairly easily. They are in toys, those little cards that play music, etc.
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Matt Bohnhoff (Mud)
New member
Username: Mud

Post Number: 3
Registered: 5-2006
Posted on Thursday, June 1, 2006 - 7:43 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Thank you Troy.
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mike (Mike11298)
Member
Username: Mike11298

Post Number: 11
Registered: 10-2006
Posted on Tuesday, December 26, 2006 - 12:40 am:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Because your 'speaker' is electromagnetic it has much less response freq. than the piezo.
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paulo melendez (Paul0)
Junior Member
Username: Paul0

Post Number: 8
Registered: 9-2007
Posted on Friday, October 5, 2007 - 10:36 am:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

although i really would want to build my own earphone

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