Tillydog wrote:Ah well, time for the old floatation test, then...
Good one! ROTFL.
I'm going to take a guess here that another kind of lam exists where the E and the I are in one piece, with a gap at the bottom of the I. Somehow, in assembly the I is flexed to make it all go together. It would not take much to determine this. Stripping off two lams would show if I guessed right and if they are alternated up and down. You have very little to lose by removing the hardware an trying to extract a couple of lams from one edge. If you find all the I's are oriented in the same direction and they don't touch the back of the E, I guess that counts as an air gap?
Yes, it seems the I bit is flexed to slide the bobbin onto it.
The I bits all rise from the same side, not alternated, and on the other side I can see through the core. So it really does have an air gap as you say. I'm not sure that's enough, though. As I said I'm only just learning about chokes, but it seems from several sources (like http://www.vias.org/crowhurstba/crowhur ... 2_070.html or http://livinginthepast-audioweb.co.uk/i ... vxformers2 ) that the size of the gap is crucial to inductance. I'm guessing that this one is too big so that's why the estimate showed only around .7H.
Tillydog wrote:Ah well, time for the old floatation test, then...
yeah, it does seem like witchcraft this hobby sometimes
yeah, it does seem like witchcraft this hobby sometimes