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Posts tagged with "electronics"

The DIY Magic of Amateur Radio

So many people still look at ham radio as ancient and obsolete. However, we have our own satellites, we create new and innovative communications protocols, we build and invent new electronic devices, and that’s just a sampling of activity. We’re also not just about emergency communications, though that is a definite service we provide. We are a community of scientists, astronauts, teachers, students, wives, husbands, children, and clubs. Check out this video, and share it around.

This video, “The DIY Magic of Amateur Radio,” is an 8-minute video released by the ARRL that follows some of the innovative, imaginative and fun ways “hams” use radio technology in new and creative ways. The presentation is directed toward the DIY (do it yourself) movement, which is inspiring a new generation of creators, hackers and innovators. The message should be helpful for existing members to shape the ways they understand and talk about ham radio. For more information and related resources, visit http://www.arrl.org/wedothat-radio-org

From my friend, Bill:

This video took us the last 14 months. It is now available for viewing on YouTube. My personal thanks to everyone involved in its production for making it a reality. You are all listed in the credits (and I pray I didn’t forget anyone). Special thanks to our Director Dave Bell, W6AQ; our Writer Henry Feinberg, K2SSQ and our Principal Cameraman Dave Booth, KC6WFS who freely donated their time and creative talent to this project. We sincerely hope that all of you will enjoy it.

If you are interested and want to ask me about it, feel free to contact me.  You can also follow me on Twitter - @NW7US - while I have a set of topics about which I typically tweet, amateur radio is on the top of my list.  Just Tweet me your question.  I’ll do my best to answer you.  - Tomas, NW7US

(Source: nw7us.us)


Erasing A CD and DVD With Spark Gap / HV
The reflective metallic layer on the disc is literally obliterated by the spark gap. The spark gap follows the path of least resistance. The CD recording medium is conductive, so it arcs to the nearest point, vaporizing it until nothing is left.

Here is the same process, used on a commercial DVD:

Pretty cool stuff.  To accomplish this, a high-voltage transformer is used (TV), and small motors powered by battery.  See the following:

Destroying a CD and DVD with Spark Gap HV

Erasing A CD and DVD With Spark Gap / HV

The reflective metallic layer on the disc is literally obliterated by the spark gap. The spark gap follows the path of least resistance. The CD recording medium is conductive, so it arcs to the nearest point, vaporizing it until nothing is left.

Here is the same process, used on a commercial DVD:

Pretty cool stuff. To accomplish this, a high-voltage transformer is used (TV), and small motors powered by battery. See the following: