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 Post subject: Anyone know of inductor assortments that are available?
PostPosted: Dec Fri 08, 2017 3:37 pm 
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Joined: Feb Thu 24, 2011 3:13 pm
Posts: 707
Location: Ironwood, MI
My apologies if this is the inappropriate place to post this.

I am doing some experimentation with receiver RF coils and would like to
find an assortment of RF inductors ranging from 1 microhenry to 1 millihenry.
Does anyone know if there are any companies that still offer such an assortment?
The only ones I have been able to find are those designed for super low
printed circuit voltages on that auction website. Nytronics used to make nice molded
inductors that could withstand up to 1400 volts RMS and although I don't need that much
I believe the 200 to 300 volts I would subject an inductor to would open it up quickly.


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 Post subject: Re: Anyone know of inductor assortments that are available?
PostPosted: Dec Fri 08, 2017 6:21 pm 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 2123
Location: The Old Dominion VA 23518
Aside from Bourns, I don't know of anyone still making "real" RF inductors for through-hole (leaded) applications. Still, no single Bourns/JW Miller series covers the range you are seeking, so a design kit/assortment probably isn't made with that range:

http://www.bourns.com/products/magnetic ... -rf-chokes

What's available from Mouser and Digikey:

Mouser:

https://www.mouser.com/Passive-Componen ... ?P=1z0z5h6

Digikey:

https://www.digikey.com/products/en/kit ... ageSize=25

Me, I've just accumulated what I need from various vendors:

Circuit Specialists (They used to carry JW Miller adjustable stuff...)
RFParts - some chokes
BGMicro - some axial chokes I needed for a TV project.
All Electronics - spotty, but some bargain stuff when they had it - MIL microhenry chokes
eBay - when several favorite sellers were offering bulk buys of coils and chokes
Dan's Small Parts and Kits - money orders only, snail mail both ways, but occasionally the good buy.
Talon Electronics - some MIL chokes
Jameco - had some Toko assortments in their grab bags - I shoulda bought more.
Electronics Goldmine - some chokes, again, spotty, but 100/$3 is a good deal for some.

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Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Anyone know of inductor assortments that are available?
PostPosted: Dec Fri 08, 2017 7:03 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 22136
Location: Somers, CT
Operating voltage? Current handling requirements? Adjustable or fixed?

A few years back you could order through hole inductor kits from Coilcraft--I had a few of their kits when I was playing around with some low power RF projects using solid state components. I don't see them listed at this time.

Most experimenters have moved over to toroid cores, which work fine but with limitations regarding DC current and saturation issues.

The days of finding Miller coil forms or wound coils ended back in the 80s.

Pete

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Just because it can be done doesn't mean it should be done.


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 Post subject: Re: Anyone know of inductor assortments that are available?
PostPosted: Dec Fri 08, 2017 7:14 pm 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 2123
Location: The Old Dominion VA 23518
Also, just remembered - Ohmite still makes plate chokes - "Z" line chokes. Z-144, etc.

https://www.mouser.com/Ohmite/Passive-C ... 0gZ1z0zldm

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Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Anyone know of inductor assortments that are available?
PostPosted: Dec Sun 10, 2017 9:38 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4879
Location: 253 Blanche St. Plymouth, MI USA
I have many dozens of Miller, Meissner and Merit brand chokes and such in my stock but you would have to give me more specs. These are in small boxes. Would be best if you came up with any of their part numbers.
I am in Plymouth, MI by the way and sell parts at the Vintage Electronics Expos if you ever come down "under the bridge"
Next one is Jan 27 2018 in Farmington Hills. www.thevee.org
Mark Oppat
moppat at comcast dot net


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