[sdiy] filters, inductors & Q

[jhaible at debitel.net]

Here's a thread at The Lab forum which you may find interesting:

http://www.prodigy-pro.com/forum/viewtopic.php?
t=4872&postdays=0&postorder=asc&start=0

Quick read returns there might be problems in the low frequency
range. Or maybe not. I'll follow the thread - very interesting.

BTW, here's another thread from a guy who litterally goes inside
some vintage transformers in order to reveal their secrets:

http://www.prodigy-pro.com/forum/viewtopic.php?t=5062

JH.



> Hi Ingo, Jürgen and all,
> 
> 
> I do indeed mean toroids. <homer> Mmmh.., dough-nuts! </homer>
> But of course such a pot core is an option as well. With the proper 
> mounting hardware its a little easier to get on a PCB as well.
> 
> Cheers,
>   René
> 
> jhaible at debitel.net wrote:
> >>could it be that you both are referring to different things?
> >>I mean, a true toroid inductor (like a toroid mains transformer, 
> >>Deutsch: Ringkern) is indeed difficult to wind by hand.
> >>Except mains transformers, I think I've never seen inductors of this 
> >>type with many winding turns.
> >>
> >>There's also that other type (Deutsch: Schalenkern, I forget how these 
> >>are called in English), where the space where the winding(s) are is 
> >>sort of toroidal, and surrounded by the core material. These are pretty 
> >>easy to wind, since the the windings are on cylindrical plastic 
> >>carriers. After the winding job is done, the carrier and the two halves 
> >>of the core are assembled.
> > 
> > 
> > 
> > Pot cores are fine. But I've seen tiny toroidal cores, so I fear
> > Rene was actually talking about these.
> > 
> > BTW, LEO brought up "pot core" - I just mention this because my other
> > online translator didnt. ( http://dict.leo.org/ )
> > 
> > JH.
> > 
> > 
> > 
> > -------------------------------------------------
> > debitel.net Webmail
> > 
> 
> -- 
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
> 
> 
> 
> 




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