[ARC5] ARC-5 passive filter take II

[Kenneth G. Gordon]

If I can find them, I have a fairly large box of ex-Telco 88 mH toroids. If you 
have poor luck with what you are trying, I'll try to dig some out and send you a 
couple.

Ken W7EKB

On 30 Apr 2016 at 15:05, J Mcvey via ARC5 wrote:

> 
> It was going to be difficult to wind a torroid  with sufficient inductance to
> work in the 8K line, so I opted for the low z 8 ohm speaker circuit. AS it turns
> out, a common mode line filter torroid ( I love to re-purpose stuff) wired in
> series aiding mode provides about 200-250 ohms reactance at 700 Hz. The core
> material isn't the best for frequency response, but I think it will suffice.
> There are some of these type torriods that are double wound back such that each
> winding only occupies half the core on each side. The others are wound in the
> traditional way . The traditional 300 degree winding is more efficient for this
> purpose.
> 
> The insertion loss was about  2.4 db . None the less,  it was still loud
> enough with very little drive with just the series LC. The final design will be
> the series resonant LC with a parallel LC across the speaker.
> 
> Who knows? If I like it enough, I may spring for better materials! Stranger
> things have happened.
> 
> 
> 
> 



Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne