"J Shrum" wrote in message
news
Greetings,

Recently I bought a grab bag of mixed toroids from www.allelectronics.com
..
I bought some T-37's and T-50's. The problem is... they're not color
coded,
and not identified by mix. So I have mystery toroids T-37-?? and
T-50-??...

The question is, is there a way to come up w/ a rough estimate of the mix
value? I wound some test coils and come up w/ these figures:

T-50 15turns 30awg = ~150uH

Al = 150uH * square(1/15) = 667


T-37 9turns 30awg = ~180uH

Al = 180uH * square(1/9) = 2200


See if these Al values look realistic. Even if not, this is the value of
inductance of one turn for the core which some manufacturers used as Al many
years ago when I worked with the devices. The inductance ratio varies as the
square of the turns ratio.

John