Arv Evans <arvid.evans@...>
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The inexpensive "universal testers" that sell for less than $25 on Ebay will evaluate most toroid cores for inductance. Just add 5, 10 , and 20 turns, measure inductance, then do rhe math to reveal probable characterestics. Not super accurate, but should get you in the ballpark.
Further tests can be done to find core saturation, heat rise, and q-factor.
All this does require some knowledge of electronics and maybe a little physics.
No surprise, Lee
Although adjunct to Q'Labs topics, the big conundrum
with toroids remains : how to know!
I have yet to discover the one-true-posting which will enable me
measure and evaluate, *with simple means*, the jumble of toroids
languishing in my treasure-box...
Trystan : over to you!
On 22/05/2021 22:15, Leland L. Bahr
This is a piece of crap. The toroid is fake and not even a
type 2 red core, just painted red. This thing is super
inefficient. Most of your power will go into heat. I threw
mine away. Pure Junk. A waste of money.
On 5/22/2021 1:25 PM, K2DB Paul
Thx, I just ordered one !