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Old 20th Mar 2019, 7:37 am   #494
Craig Sawyers
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Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,941
Default Re: Audiophoolery?

I can't even imagine what is in there that weighs 46kg. Sand?

Actually, at one point I designed a security gate (the sort you see in supermarkets etc to stop you nicking stuff with a tag) with a class D power amp feeding the coils. It therefore needed a filter on the output. That had a monster inductor on a ferrite core, and it warbled irritatingly at low kHz as a result of magnetostriction.

Although, with the help of ISVR at Southampton I shut it up in an engineeringly satisfactory way, I initially proved the point by:

Filling the filter box with sand.

Worked just fine, apart from weighing lots. Although not 46kg by a long shot!

Last edited by Craig Sawyers; 20th Mar 2019 at 7:50 am.
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