quickie interference - SOLVED

[aragorn723]

Hi,

Is there a way to reduce transformer noise from my amp from conducting to the Quickie?  The Quickie is in an entertainment center on a shelf, and the amp is below that.  The whole thing needs to be protected from my little boy, so there's a plastic gate in front of the whole thing.  Would covering the wooden box with a metal plate on the bottom help?  Any other ideas to reduce the hum?  Thanks,

Dave

[Paul Joppa]

Assuming it's magnetic field coupling, a mild steel plate under the Q would likely help. 1/4 inch is not too thick. It is probably the easiest, cheapest way to determine if that is in fact the problem. If it helps, but not enough, then google "magnetic shielding" for more than you ever wanted to know...

[aragorn723]

what's a good place to find a metal plate like this?

Dave

[2wo]

How about a cast iron frying pan to test...John

[Paul Joppa]

Onlinemetals has 1008 steel (low carbon = good magnetic proerties, as I understand it) up to 0.075 inch thick, i.e. 14 gauge. The frying par test is a great idea, though it may not have the best properties it IS think!

[aragorn723]

Is this the right material?  http://www.onlinemetals.com/merchant.cfm?pid=12782&step=4

Dave

[aragorn723]

not sure if anyone has read this thread in a while, but the hum turned out to be from my dac, not the quickie    After changing the dac from AC power to usb (battery) there is almost no hum.  Thanks,

Dave