Fred Jensen wrote:
A big thanks to all who provided information and ideas on the "POW
Radio" project. FWIW, I learned a few things:
We're going to use a 1N34A and do a little tap dance around the razor
blade issue in the introduction.
73, and thanks again,
Fred K6DGW
Auburn CA CM98lw
Fred, you are doing almost exactly what I do. Every year now for the
past 4 or 5, we build the POW radio with the AP Physics class here in
Anchorage. The teacher (who is a national award winner) fits the project
into his lessons on resonance. We have a model with the pencil lead and
razor blade, which the kids can see, but they use a diode. The coil is
magnet wire wrapped around a short length of PVC tubing; we have found
that we don't even need a capacitor, and suspect there is enough stray
capacitance between the coil windings to do the job. Nothing seems
critical in this exercise except for a decent ground and antenna (which
the school district kindly installed on the roof for us.) The smiles on
the kids' faces when the radios "sing" makes it very much worthwhile.
Good Luck!
Lynn KL7IKV
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