Hammond 159ZL as inductors in a Pi-filter? - diyAudio
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Old 3rd April 2003, 06:15 AM   #1
mats73 is offline mats73  Sweden
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Question Hammond 159ZL as inductors in a Pi-filter?

Came across these while searching the web for components and thought that they might be ok.

Since I however know absolutely nothing about "open-chokes", I searched here to see if anyone had used them and, naturally, nobody had....

So, whatīs wrong with these(?): Inductance 2,5mH, DCR 0,044, "Saturation current"(DC) 10 A.
Price: 20$ a pop! (not that bad is it?)
available here
manufacturers info

Cheers
Mats
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Old 3rd April 2003, 02:07 PM   #2
uli is offline uli  Austria
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hi Mats,
there are some threads about those chokes...

Uli

PS: nothing wrong except size
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Old 4th April 2003, 02:41 PM   #3
mats73 is offline mats73  Sweden
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Default canīt findīem....

I have searched for info but nothing about these chokes comes up.

I found one thread where you(Uli) said you used another choke from Hammond that was bigger, I think.

Is this the same kind of deal except smaller?

Cheers
Mats
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Old 6th April 2003, 03:06 PM   #4
uli is offline uli  Austria
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Hi Mats,
the point is that if you use cores that form a closed circle
in some way, you should NOT apply DC voltage!
The Hammond chokes (EI cores) have an air gap to
solve the DC problem. You are free to use the cheapest
choke that fits your bill (current handling capacity vs.
DC resistance vs. inductivity)

Uli
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Old 7th April 2003, 01:10 AM   #5
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I have searched this forum for references to the 159ZL (Hammond's 159ZL DC choke) and have found very little. I have also found a local supplier that carries them. So, my question is......would they be the ideal choke for Kristijan's design given their very low DCR? I'm very near to having all the parts for my Aleph 5 and the power supply is the most challenging part.

Regards,
Dan
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Old 7th April 2003, 01:29 AM   #6
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Default DCR in Pi filters

I am one of the least qualified to comment, but I would have thought that:

1. so long as your AC supply is high enough to take a small loss
2. the constant (DC) current rating of the choke is adequate

This will be fine. Recall some people actually use RC filters in the supply rail by choice. This is a totally different scenario to a speaker xover where DCR is a significant problem.

Given the cores are gapped & they are rated appropriately, I would suggest you go for it!

regards
mark
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Old 8th April 2003, 06:20 AM   #7
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I've got several pairs of inductors left from various I made with good iron cores, they are gapped for 3.5 to 6 amps.

I'm actualy using a pair of these gapped for 3 amps with 16 mH on my Aleph 4 with excellent results.

The general spec for these are:

Iron: Silicon laminations M-15
Size: EI 100
Inductance: 10 to 14 mH
DCR: 0.05 Ohms
Amps: diferent gap for 3.5 to 6 Amps
Finish: Metal bracked and varnish dipped.

I will post a photo.

Anyone interested please contact me.
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Old 8th April 2003, 06:30 AM   #8
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Default Inductors

Photo of undipped inductors:
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File Type: jpg inductors 001.jpg (64.7 KB, 431 views)
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