Re: [TCML] ferrite variac

[jhowson4@xxxxxxxxxxx]

I have no idea what type they are.  But I am pretty sure they are ferrite since they don't seem heavy enough to be iron.  i got them out of a device that consisted of 4 toroids with 12gauge wire wrapped around them,  4 circuit breakers, and 4solid state relays.  Each relay was the 3/4 the size of  a deck of cards.  that is all the information I have on them.  

-------------- Original message -------------- 
From: Ed Phillips <evp@xxxxxxxxxxx> 

> hello all, 
> I am trying to make a home brew variac (for tesla coil use). I got my hands on 
> 4 (4in outer diameter 3in inner diameter 1in high) ferrite cores. I am planning 
> on stacking them together for one big ferrite core. do you guys think that this 
> will work for a variac core? or do I need a laminated iron core? 
> 
> many thanks 
> Jay Howson" 
> 
> What type of ferrite is this? There are many different types with 
> differing magnetic properties, particularly permeability. All share a common 
> saturation flux density of the order of 3000 to 4000 gauss. 
> 
> Ed 
> 
> 
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