It is remarkably difficult to find the data about a few simple torroids, manufacturers make so many and characterise by just the size, without the essential ferrite characteristics, especially the Al = uH/turn data.
The coils inductance, uH = (Al * t^2)/1000. Dimensions are in mm.
So here are some common ones:
Type Width Thick Al
Torroids
FT50-43 T37-0 12.7 4.9 440
FT50-61 T37-2 12.7 4.9 69
FT82-43 T37-6 21 6.35 470
FT82-61 T37-7 21 6.35 79
Two hole torroids
Type Width Length Al
BN-43-202 T80-6 13.3 14.35 2220
BN-61-202 T80-10 13.3 14.35 385
More data at www.torroids.info, parts available from 'kit parts'.
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