" wrote:

On Sunday, January 19, 2014 1:05:03 AM UTC-5, PrecisionmachinisT wrote:


Or you could wind your own...really no reason to use E laminations you have

a lathe...simply trepann out the coil cavity, leaving a "post" in the center

drop in the coils and screw on a round cover to complete the flux gap

If you do decide to wind your own, I would recommend using laminations from a power transformer before using a solid chunk of material. Audio transformers use thinner laminations than a power transformer, but ones from a power transformer would be better than solid.

If you want I could keep an eye out for kind of suitable transforms at the local scrap yard. The shipping via a flat rate box would not be too bad. The last heavy stuff I shipped using a flat rate box , got separated from the box. But since then I got some stronger tape.


A large, powdered iron toroid works even better. Like an old 3A
variac. I needed a modulation transformer for a AM mobile radio back in
the '70s. I wound a second winding on a surplus 88 mH telco toroid, and
had excessive audio bandwidth.


--
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