Author Topic: Variable inductor  (Read 747 times)

octopus1

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Variable inductor
« on: November 02, 2020, 08:35:51 PM »
sorry for all the component questions, Is there anywhere to find suitable variable inductors besides coil craft? i only need one and the 8$ shipping gis kind of ridiculous. I haven't been able to find any on digikey (what i'm using for the rest of the ud2.7 components) and its the same thing on mouser, cheap component but not cheap shipping. If anyone has any extras and would be willing to just send me one in a envelope i would be happy to pay for it.

regards, thank you

Offline davekni

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Re: Variable inductor
« Reply #1 on: November 02, 2020, 08:52:44 PM »
Digikey has variable inductors:
https://www.digikey.com/en/products/filter/adjustable-inductors/72

Other options (in case you've already submitted your Digikey order) include EBay (most from far east with long shipping) or making your own.  Home-made ones usually aren't as easy to adjust unless you are just rewinding an existing variable inductor for a different inductance range.  I've had success just sliding a small ferrite rod into a coil and taping it in place at the proper adjustment, or adjusting shims in the gap of a small e-core pair or cut toroid.
David Knierim

octopus1

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Re: Variable inductor
« Reply #2 on: November 02, 2020, 09:13:06 PM »
mmm how does this one look?its the right inductance for what ionoceans recommends for my type of coil. Thanks for all your help!

Offline davekni

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Re: Variable inductor
« Reply #3 on: November 02, 2020, 10:19:00 PM »
Not sure which one you are referencing - missing link?  If it's the correct inductance and the DC resistance is low compared to reactance at your intended frequency, then it should be fine.
David Knierim

Offline klugesmith

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Re: Variable inductor
« Reply #4 on: November 02, 2020, 10:36:33 PM »
What inductance, frequency, current, and adjustability are of interest?
I have a nice Variometer styled like this one: 

Two coils with similar inductance, and coupling adjustable from nearly -1 to +1,
wired in series gives continuous adjustability from 2L to nearly 0 and nearly 4L.
« Last Edit: November 02, 2020, 10:39:49 PM by klugesmith »

octopus1

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Re: Variable inductor
« Reply #5 on: November 02, 2020, 11:01:19 PM »
sorry about the missing link, https://www.digikey.com/en/products/detail/A119ANS-T1038Z/TK2410-ND/25271?itemSeq=343609756
klugesmith, its one for phase lead so 25-50uf range

Offline acobaugh

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Re: Variable inductor
« Reply #6 on: November 02, 2020, 11:22:08 PM »
I would just bite the bullet and order from coilcraft. Get a couple of different ranges so you have options. That way you at least can make up the cost of shipping. I just ordered some 7M3 series from them the other day, and shipping was pretty quick to Pennsylvania.

Offline davekni

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Re: Variable inductor
« Reply #7 on: November 02, 2020, 11:47:05 PM »
If I'm reading the spec correctly, adjustment range is only +-10%.  Fine for tuning an IF stage, but not that useful for phase-lead.  Also doesn't specify DC resistance, only Q at 2.52MHz.

BTW, I used a fixed inductor for my DRSSTC, adjusted to compensate for delays measured in LTSpice simulation.  Actual delay was a bit higher, so swapped parts for a bit larger inductance to get more phase lead.  Didn't use a variable inductor.  (My SSTC uses a variable inductor, but for an atypical design.)
David Knierim

octopus1

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Re: Variable inductor
« Reply #8 on: November 03, 2020, 12:24:09 AM »
forget everything i have said i managed to get a free sample one

Offline acobaugh

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Re: Variable inductor
« Reply #9 on: November 03, 2020, 12:32:19 AM »
forget everything i have said i managed to get a free sample one

Lucky. I tried to get a free sample 2 weeks ago. Just needed two inductors. They denied my request. Had no problem getting a free sample 2 years ago. Didn't mind paying for them in the end, though.

High Voltage Forum

Re: Variable inductor
« Reply #9 on: November 03, 2020, 12:32:19 AM »

 


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