Could this be the perfect coils for Aleph's PS?

[Peter Daniel]

I have quite a few of those coils. Would they be good for Aleph PS? The resistance is not measurable and the size is very convenient, 4A capacity. Something tells me though, that there is no free lunch.

 

[kristijan-k]

Hello Mr.Daniel,

They look small for 2,2 mH coils, but they have ferrite core.
You did not mention for which Aleph you would like to use them.
I think that they will be hot on the Aleph 2 or Aleph 4.

Perhaps you should try and see if they can produce light !!?


Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

 

[Peter Daniel]

If I connect them in parallel they have 8A capacity and almost no voltage drop since the resistance is almost nothing. They would be good for any Aleph. Did you see the Thermistors Mr. Pass is using, they are even smaller.

I was using them in ZEN amp and no problem, however I didn't bother to check if they did what they suppose to do. The must be a catch here. Anybody knows what kind?

 

[roddyama]

Peter,

Aren't those "Common Mode Chokes" They get their inductive impedance from CM noise in one coil bucking the CM in the other coil. That why such a high inductance in such a small package. Later I'll give you some info. I lost my HD with all my links Do a search on "Common Mode Choke"; there's a couple of threads on it.

Rodd Yamas***a

 

[Holger Barske]

roddyama hits the point. Good for spike suppression with mains applications, but here? I don't think so.

@Peter: If you connect them in parallel, you will lose half of the inductance - just the opposite behaviour of capacitors.
---
Holger

 

[Jean]

If I connect them in parallel they have 8A capacity and almost no voltage drop since the resistance is almost nothing. They would be good for any Aleph. Did you see the Thermistors Mr. Pass is using, they are even smaller.

I was using them in ZEN amp and no problem, however I didn't bother to check if they did what they suppose to do. The must be a catch here. Anybody knows what kind?

If you connect them in parallel then you'll have 1/2 of inductance, would that still be enough ?

 

[Peter Daniel]

So lets say I don't connect them in parallel, 4A is still enough. Would they work, or not?

 

[stefan]

Peter,

As I see on the picture coils are for AC.

You want to use the coils in DC and may be their cores will saturate and as result inductance will be (almost) lost.

You can try them with constant current and you will see how much ripple they will remove.

If the coils are on the same core you will have full inductance if you connect them in paralel with matched ends.

 

[roddyama]

Peter,

Take a look at this thread.http://www.diyaudio.com/forums/showthread.php?s=&threadid=1898&highlight=common+mode+choke

Rodd Yamas***a

 

[Peter Daniel]

Thanks Rodd for the link. I remember, I read it before. I think Nelson Pass comments would end the discussion and prove that there is no free lunch:

"Keep in mind that this thread was started with
common mode inductors, which only filter the
noise common to two lines. These can be quite
small but have high current ratings, but will not
filter non-common mode current, and most of what
you are going to want to filter is not common mode.

This type of coil is good for common mode RF suppression,
not audio range supply filtering."

So you have to go big after all.

 

[Nelson Pass]

Those teensy little cores will saturate instantly on
8 A DC.

 

[nar]

As rated for 240V ac is light compared to a DC continuous high voltage at 6-8 amperes