Re: An Absolute Beginner With A Few Questions
- From: "Deefoo" <nonono@xxxxxxxxxxxx>
- Date: Wed, 14 Dec 2005 17:22:33 +0100
> 3) The next project is building a crystal radio, powered by radio waves.
> It mentions attaching a wire to a ground. Buying a shortwave antenna for
> simple experiments strikes me as overkill, and the pipes in my place are
> PVC plastic. Then I remembered my computer. The case that I attach my
> anti-static wrist strap to is a ground. Can I just attach the ground wire
> to the case of my computer (with the computer powered off, of course)?
> Failing that, I was told that the negative terminal of a battery is
> considered a ground. Can I just wire it to that?
A crystal radio is a passive receiver that needs power from the transmitter
and as such it needs two "wires" to the transmitter. These wires are the
radio waves (signal) and the earth (return). You should be able to use your
computer as ground if your computer is connected to the ground of your
electrical installation.
BTW, I think that your anti-static wrist strap is probably overkill as well.
--DF
.
- References:
- An Absolute Beginner With A Few Questions
- From: Pete Holland Jr.
- An Absolute Beginner With A Few Questions
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