If I have a junk box of smallish (1/2 inch dia say) torroid cores, of some unknown T-#, how many turns of wire should I guestimate for a >= 22 uH choke (for use with a MAX762 switching supply)?
I know you can't give a precise answer to that, with that information, but I just need a ballpark answer.
I simply need to exceed 22 uH for this junk-box application. I am guessing, that it is going to be somewhere in the ballpark of
30 to 50 turns.
Comments, besides suggesting that I order a choke?
The only other idea I had was perhaps paralleling that with some suitable cap and trying to find resonance with my grid dip meter. But that sounds too much like work. ;-)
Warren.