source for NYD eq inductors?

I'm having trouble finding the following values... I've checked the standard mouser and digikey and my searches have come up empty

anybody know where to grab the following values?

(poof) sorry NYD

mostly the first three ..

this would be greatly appreciated so I can try this build out

-richie

the http://wilcocorp.com/ company is going to help me out .. Finally email'd me back

any other ideas incase they fall through?

Roll your own?

Be sure off the app for the inductor you buy.
There are so many of them, so many Q's, picking the core would be a good starting point.

Hey Richie... Sorry I didn't get back to you sooner.

I used Wilco BSL-series for the biggest three inductors, and shielded Fastron "pluggable" inductors from Mouser for the rest.

As you know, I'm trying to keep certain details off the public web, so I'd appreciate it if you could edit your post and remove the L-values. Thanks.

sorry NYD!

i wasn't aware the specific L values would be a "leak"

thanks for the help though everyone.

-richie

actually the other info was way more important, induction figures are pretty much useless.

Good for comparrison between coils, but thats about it.

Doc Hoyer-only authorized Mac and Marantz winder, does not measure inductance.

Why?
It's useless!
L values depend on about three other variables.

So for an EQ, you will have to tune the inductor with the caps to get the right band.

cj im curious aboutt making my own actually

Where would be a good step to start something like that?

Is hand winding out of the question?

-richie

Hand winding is easy.
Very few turns to get those values.

Let me fool around with this torroid winder and see what I can come up with.

sometimes i feel i learned everything BUT the practical while studying physics.

thanks for the help cj

You want ferrite or grain oriented?

Hell, let's try both.

im unfamiliar with these terms

No problem.

This is about 1/100 of our torroid bonepile, so I don't think the boss will mind...



This is how you get the wire off:



This is what your left with:

capn jack, this is a ferrite core on the left, and a strip wound core.
Ferrite is a general term describing a core made out of fine particles that are glued together.
These particles improve frequency response.
What these particles are made out, well, nowdays, it could be anything, so ferrite is a general term for a powdered type core.

The other core is called tape wound, or strip wound.
It is grain oriented silicon or nickel alloy, slit to the appropriate width, then wound, anealed and epoxied.

I suggest the ferrite for a bank wound inductor for the first two lower values, and the tape wound for the other three bands.

Sound cool?

Lets head over to the Yuze.



OK, program the box. Lets try 750 turns on the tape core and see what we gets.

http://vacuumbrain.com/The_Lab/TA/Inductors/torroid_e.jpg

Load the core on the shuttle:

http://vacuumbrain.com/The_Lab/TA/Inductors/torroid_f.jpg

Tie the wire (bareley visible) onto the shuttle and load wenough wire for 750 turns (computer calculated).

http://vacuumbrain.com/The_Lab/TA/Inductors/torroid_g.jpg

WIre loaded on the shuttle:

http://vacuumbrain.com/The_Lab/TA/Inductors/torroid_h.jpg

OK, the fun part.
The shuttle is loaded, you hook the wire onto the threader and let er rip:

http://vacuumbrain.com/The_Lab/TA/Inductors/torroid_i.jpg

Take tha bad boy off carefully:

http://vacuumbrain.com/The_Lab/TA/Inductors/torroid_j.jpg

OK. Looks like the tape core needs 450 T for your biggest inductor.
Thats a lot to hand wind, but it has been done.
Wind the wire on a stick, pass it thru the hole.

Let me get the other guys wound, then, you can either PM a shipping address or use this as inspiration to DIY.

cj

id gladly cover anythign to have some custom CJ made inductors haha

that's great work :thumb:

the eq could be a child from you and NYD :wink:

Looking great CJ! I need to get back to building my coil winder...

/Anders

OK, got to wind a few more tonight, the ferrite core is looking good.

For the 800 ish mH coil, 250 turns does the trick.

This is a lot better than hand winding 450, eh?

I found out an interesting winding tweak on these torroids, these two coils have exactly the same turns.
But they are about ten percent apart as far as inductance and resonance.
The only diff is the pitch at which the wire was wound.



I found the resonant frequency of the inductor with a 0.1 cap in series with the following circuit.
Put one trace across the cap, another traee across the coil, and sweep it til the levels are equal.
Then, recored the frequency, place one scope lead across the resistor, and sweep it for the max voltage across the resistor.
The frequency at which this happens shoule be the same or very close to the frequency found with the dual trace mode.
It's just a double check.




Here, the frequency is below resonance, so the reactances( ac resistance of the cap and inductor) are not equal.
There is more voltage across the cap because its reactance increase as frequency drops.




Now we have gone past the resonanc frequency, and the voltage across the inductor is greater than the voltage on the cap, because as frequency increases, it's reactance increases:



Now we have found the resonant point.
Both voltages are equal, the reactances of the induxctor and the cap are the same, the defination of resonant frequency.



OK, we will wind the rest and check the diff between iron and powdered cores. HAppy Halloween!

cj

Gentlemen;
ferrite has high permeability, but low saturation induction with sharp hysteresis loop. It is better to use it on higher frequencies so they don't saturate on working voltages. For lower frequencies it is better to use metal tape, it has higher saturation inductance, and it is not so sharp so THD goes up more slowly and more voltage may be applied on working frequencies in inductors on cores of the same size, also they have more losses on higher frequencies than ferrites.

im gonna go read up on my basics some more and then leave a comment that doesn't just say

whoa

im gonna go read up on my basics some more and then leave a comment that doesn't just say

whoa

Click to expand...

Whoa!

:green: