Made on Earth

Reports from the world of backyard technology, including a cockroach-controlled robot, high altitude glider, student-built cyclotron, Vee 9 solar vehicle, robotic CD burner, coffee mug ramjet, and more.

From the column Made on Earth

By Xeni Jardin, Jason Kottke, Bob Parks, Paul Spinrad

Errata

MAKE reader Todd Johnson wrote:

"I received Make Volume 02 today to my delight.

"I found a problem with the article "Smashing Success" on page 17 however. The article states that "squarewave AC runs through the electromagnet..." Actually, the current in a cyclotron magnet is tightly regulated DC. The accelerating potential is provided by an RF amplifier that puts an alternating electric field on an internal D-shaped electrode. Magnetic fields produce an acceleration perpendicular to the motion of a charged particle, and can therefore not be used to change the energy (or speed) of these particles. An electric field is necessary."

Thanks Todd!


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