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Re: How to make cheap big cores?



Original poster: "Jan Florian Wagner by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jwagner-at-cc.hut.fi>


> Hi, I'm looking for a way to get a big HF transformer cores.
> Allstar magnetics have the perfect TDK EC120 cores in stock, but 
> at the price of US$157ea for 10+, puts it way way outside my budget.

Umm, if you are looking for big ferrite cores, search for larger dead PC
power supplies (maybe from electronics dump yard / recycling yard? or some
computer club). It probably is too big a trouble to form a core yourself.

A variety of PC PSUs can go up to 1kW. If you use a high frequency maybe
you could pull one extra kW, if not, parallel two or three of the cores.

If you can get EE-cores, paralleling is even easier because you can stick 
cores right together.

Salvaging is by far the cheapest way, and you can even get some free
MOSFETs and PWM controllers this way. :o) Some may be burned, though.

To salvege the cores you can soften the core binding epoxy by slowly
heating the core above a candle. Some claim cooking works as well, but in
my experience it either does not work at all or cracks the core.

--
*************************************************
 Jan Florian Wagner
 http://www.hut.fi/~jwagner