Mystery Component

C

Cursitor Doom

Guest
Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?



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On Fri, 12 Jul 2019 19:48:29 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?
Click to expand...

Transient absorber? Carborundum or MOV stuff or some such material
maybe.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
On 12/07/2019 20:48, Cursitor Doom wrote:
Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?
Click to expand...

Coil former for winding custom chokes?

piglet
 
On Fri, 12 Jul 2019 23:48:26 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

On Fri, 12 Jul 2019 21:01:00 +0100, Piglet wrote:

Coil former for winding custom chokes?

I thought you had a winning suggestion there, Erich. Until I remembered
the things are marked on one end.
Click to expand...

It's still a winning idea. The marking is for AFTER the coil is wound
on the powdered iron core. If the coil were a single layer, it
doesn't make much difference which way it's inserted into the PCB.
However, if the coil were a multi-layer inductor, the capacitance to
ground would be different depending on which way the coil were
inserted. Therefore, polarity would be important. If all the coils
were wound in the same manner, such as starting the end marker, it
would be possible to insert them all in the same direction.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
On Fri, 12 Jul 2019 21:01:00 +0100, Piglet wrote:

> Coil former for winding custom chokes?

I thought you had a winning suggestion there, Erich. Until I remembered
the things are marked on one end.




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This message may be freely reproduced without limit or charge only via
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On Fri, 12 Jul 2019 19:48:29 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there.
Click to expand...

Powdered iron coil form. Use and ohms-guesser to check if the
powdered iron is conductive. If it's powdered iron, it will be mildly
conductive. If you want to determine the mixture, wrap a few turns
around the form, measure the inductance, and calculate AL (inductance
per turn):
<http://www.encyclopedia-magnetica.com/doku.php/al_value>
Type 31 material would be a good first guess(tm):
<https://www.fair-rite.com/materials/>
I can't identify the exact device or expected AL without dimensions
and inductance measurements. Maybe something like this:
<https://nanfangdianqi.en.made-in-china.com/product/mKrENBxlORVD/China-Axial-Leaded-Power-Ferrite-Bead-Inductor.html>

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
On 2019-07-12, Cursitor Doom <curd@notformail.com> wrote:
Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?
Click to expand...

MOV?




--
When I tried casting out nines I made a hash of it.
 
On 7/12/2019 2:48 PM, Cursitor Doom wrote:
Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?
Click to expand...
More important, what are you missing that you can't take a
minute and a half to get a picture posted.

Mikek
 
On 13/07/19 03:49, amdx wrote:
On 7/12/2019 2:48 PM, Cursitor Doom wrote:
Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?



  More important, what are you missing that you can't take a
minute and a half to get a picture posted.
Click to expand...

Indeed.

That would reduce irrelevant speculation and get a better
answer. It would also save /our/ remaining lifetime.

However, not assessing what's beneficial does fit
with CD's other postings.
 
On Fri, 12 Jul 2019 21:49:08 -0500, amdx wrote:

More important, what are you missing that you can't take a
minute and a half to get a picture posted.

Mikek
Click to expand...

OK, Ok, I'll do it already.



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On Fri, 12 Jul 2019 16:47:35 -0700, Jeff Liebermann wrote:

Powdered iron coil form. Use and ohms-guesser to check if the powdered
iron is conductive. If it's powdered iron, it will be mildly
conductive.
Click to expand...

It's not the least bit conductive AFAICT, even when probing small
fragments 1mm apart. I think you and Erich are right in your
suppositions, but it must be some other ferric material than powdered
iron (which would be pretty low-Q I'm guessing.)

Sigh.. I'll post a picture later when I get my sh*t together.



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.
 
On Fri, 12 Jul 2019 21:49:08 -0500, amdx wrote:

More important, what are you missing that you can't take a
minute and a half to get a picture posted.
Click to expand...

Well, what should have taken a minute and a half has taken over an hour
and a half and still no go. Image hosting site seems to have some sort of
error baked into it today. So I'm done, basically.
Thanks to Erich and Jeff; I'm sure they've got it right between them
anyway.




--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.
 
Cursitor Doom wrote:
Gentlemen,

I bought a job lot of components a while back and am trying to sort them
out. I've come across about 250 devices I've never seen before and would
like to know what they are. Ideally I would post a picture, but I'm
hoping to get away with just a description at this stage.
These are two-lead devices with bodies about the size of 5W power
resistors. They have a mark at one end so are presumably intended to be
used one way around. The bodies are made of some sort of ferrite as a
light dusting of superficial rust was apparent on several. I gently
cracked one open with a hammer and the ferrite just crumbled away.
There's nothing else there. My component identifier which normally
identifies just about everything was unable to assist. Resistance
measurements indicate open circuit both ways.
Any ideas?



? Carborundum varistor?
Click to expand...
 
On Sat, 13 Jul 2019 21:34:53 -0800, Robert Baer wrote:

> ? Carborundum varistor?

Try this link for the photo:

http://oi68.tinypic.com/2ewjwch.jpg




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This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.
 
On 14/07/19 10:26, Cursitor Doom wrote:
On Sat, 13 Jul 2019 21:34:53 -0800, Robert Baer wrote:

? Carborundum varistor?

Try this link for the photo:

http://oi68.tinypic.com/2ewjwch.jpg
Click to expand...

Good picture of 200 components :(

Has it occurred to you that a couple of close-up pictures
of a *single* component might give more *information* for
us to use? Perhaps I need to spell out that different
pictures should show different parts of the component.
 
On 14/07/2019 10:26, Cursitor Doom wrote:
On Sat, 13 Jul 2019 21:34:53 -0800, Robert Baer wrote:

? Carborundum varistor?

Try this link for the photo:

http://oi68.tinypic.com/2ewjwch.jpg
Click to expand...

You didn't mention if the body was attracted to a magnet. However I am
now sure it is a ferrite choke form - that flatted portion at the end of
the body is intended to anchor a start of the winding from slipping as
the coil is wound.

piglet
 
On Sun, 14 Jul 2019 11:53:22 +0100, Piglet wrote:

On 14/07/2019 10:26, Cursitor Doom wrote:
On Sat, 13 Jul 2019 21:34:53 -0800, Robert Baer wrote:

? Carborundum varistor?

Try this link for the photo:

http://oi68.tinypic.com/2ewjwch.jpg





You didn't mention if the body was attracted to a magnet.
Click to expand...

Good point. I've just tried and it's strongly attracted.

However I am
now sure it is a ferrite choke form - that flatted portion at the end of
the body is intended to anchor a start of the winding from slipping as
the coil is wound.
Click to expand...

Erich, you're a genius! Many thanks. :)

Now I have the problem of identifying the variety of ferrite used. As you
will know there are very many different grades and materials of such
cores and I can't think of any way of testing to ascertain exactly which
these are made from. Shame.



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.
 
On 14/07/2019 12:03, Cursitor Doom wrote:
On Sun, 14 Jul 2019 11:53:22 +0100, Piglet wrote:

On 14/07/2019 10:26, Cursitor Doom wrote:
On Sat, 13 Jul 2019 21:34:53 -0800, Robert Baer wrote:

? Carborundum varistor?

Try this link for the photo:

http://oi68.tinypic.com/2ewjwch.jpg





You didn't mention if the body was attracted to a magnet.

Good point. I've just tried and it's strongly attracted.

However I am
now sure it is a ferrite choke form - that flatted portion at the end of
the body is intended to anchor a start of the winding from slipping as
the coil is wound.

Erich, you're a genius! Many thanks. :)

Now I have the problem of identifying the variety of ferrite used. As you
will know there are very many different grades and materials of such
cores and I can't think of any way of testing to ascertain exactly which
these are made from. Shame.
Click to expand...

Starting point for guesswork would a general purpose MnZn ferrite (N87
is probably best known). Probably meant for chokes and motor suppression
applications 10kHz-500kHz. May be good up to 200mT

Wind 10-20 turns and measure the inductance.

piglet
 
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