crazydoc

Mumetal source for shielding ACMP preamps
« on: January 05, 2009, 05:56:26 PM »
I'm going to experiment with shielding the PS transformer or eq boards to try to decrease the induced AC hum in my units. The best (cheapest) source I can find is this:
http://www.magnetic-shield.com/products/lab-kit.html kit LK110

Without knowing what thickness/type will work best, I'll have to experiment. Does anyone have an idea which thickness would be adequate so I could just buy that and not have a bunch left over from a $100 expenditure?

Or, is there a cheaper/better source? Any mumetal on old TV's, computers, or other salvage equipment?

Thanks
Luckily, there is more than one way to skin a cat.
The secret of happiness is having low expectations.


edanderson

Re: Mumetal source for shielding ACMP preamps
« Reply #1 on: January 05, 2009, 09:05:58 PM »
lessemf.com

ed

pucho812

Re: Mumetal source for shielding ACMP preamps
« Reply #2 on: January 05, 2009, 11:06:20 PM »
there are other possible solutions... having the power transformer separate from the unit. in an external box...
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

crazydoc

Re: Mumetal source for shielding ACMP preamps
« Reply #3 on: January 06, 2009, 12:45:05 AM »
lessemf.com

ed
Thanks - that looks more reasonable (price-wise, not necessarily the site motivation.)
Luckily, there is more than one way to skin a cat.
The secret of happiness is having low expectations.

crazydoc

Re: Mumetal source for shielding ACMP preamps New
« Reply #4 on: January 06, 2009, 12:48:07 AM »
there are other possible solutions... having the power transformer separate from the unit. in an external box...
The transformer has four secondaries. Eight wires (nine with chassis ground) with connector(s) coming into the box is certainly possible, but not very elegant. But that may end up to be the best fix.
« Last Edit: January 06, 2009, 01:06:32 PM by crazydoc »
Luckily, there is more than one way to skin a cat.
The secret of happiness is having low expectations.


 

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