[600MRG] FT-37-WC toroid

[Paul N1BUG FN55mf]

I've bought parts from Amazon, but I don't entirely trust them. They
don't admit to having these high permeability toroids.

Since learning this is u=10,000 material, I found two options that
should be very near equivalents to the FT-37-WC.

Uncoated:
Fair-Rite 5976000201 at 67 cents each from Digi-Key

Parylene coated:
Magnetics YW41003TC at 68 cents each from Digi-Key

Parylene is rated to 130 degrees C vs. 200 degrees C for the epoxy ones
from Amidon, but if they ever get anywhere near that temperature I've
got much bigger problems!

I'm ordering a few of each. The price goes down significantly if you buy
10 or more.

73,
Paul N1BUG





On 11/20/2024 3:06 PM, DANA MYERS via 600MRG wrote:
>> On 11/20/2024 11:55 AM PST Lawrence Stoskopf <lstoskopf at cox.net> wrote:
>> Amazon has access to many toroids.  If you know the suffix number on
>> the -37 size you can buy 10 or so for maybe $10 or so.  They may vary
>> a bit, but most ferrites aren't frequency  dependent as far as exact
>> inductance so....
> I do buy components on Amazon, but I almost always verify they're what I
> expected before using them. The supply-chain integrity is highly
> variable there. Buyer beware.
> Dana  K6JQ