-----Original Message----- From: William Beaty [mailto:[EMAIL PROTECTED] Sent: Thursday, October 25, 2007 10:44 AM To: [email protected] Subject: Re: [Vo]:Re: "Cold" electricity
On Thu, 25 Oct 2007, John Winterflood wrote: >> thomas malloy wrote: >> As Jed pointed out, a pair of heavy iron frying pans might make a superb >> Faraday cage. >Yes, and they solve the problem of shielding low-freq magnetism. For >example, to well shield the magnetic component of 60Hz you'd need many >inches thick of copper. Just 1/8" mu-metal or the iron frying pan will shunt the magnetic fields around the device under test. Without a magnetic shield, it would be easy to couple a 60Hz magnetic field into the inductors inside, and it would be quite efficient. Try holding a magnetic tape degausser nearby to see how much power could couple inside. Hoyt Stearns Scottsdale, Arizona US http://HoytStearns.com
