Inside a wirewound pot

Sound right, though a bit expensive. The lubricant is the iffy part, I would not know what to choose, maybe a carbon or copper filled type.

I would also suggest ~1-5 nf ceramic cap between ground and wiper, providing a hold function when the wiper is a bit bouncy.

IIRC those pots are constructed with fine wire wrapped around an insulating rod that forms the major helix. Take a closer look with a magnifying glass at your wire to see if this is what you have. If yes, then you still have discrete steps in the resistance as the wiper slides along the element. Turning the knob slowly should allow the wiper to drop between 2 turns, bridging them, and give you a step response. Rapid turning can cause wiper bounce.

Is the Deoxit or your lubricant conductive? Art

First off, you dope... nobody suggested a damned thing about YOUR pot.

You already described YOUR pot in your first post as being a ten turn pot. So get off your high horse about that. You were told in the last post you said this crap that it had NOTHING to do with YOUR circumstance at all.

As far as dressing out the mechanism goes, you were not supposed to overhaul it to begin with, and it will likely never work the way it did originally.

You do not want 'deox' on it, you want 'anti-oxidant'.

This is proof that you really do not know much about what you speak of. They are designed specifically such that more than one wire is always in contact with the wiper at any time.

That is a good way to make a big, fuzzy wiper node on your pot, and make for odd parasitic effects. NO, conductive media at all gets put on the pot.

There is no need for any deox or anti-ox either, because it is stainless or Nichrome wire.

This one's for YOU, Archi....in celebration of your MOUTH.

A twisted old Pervo named BART! Liked to inhale his own Fart "It goes down like a dream, The gas makes me scream, And the beans are good for the heart!"

mike

m II wrote in news:4c3ff1b2$ snipped-for-privacy@news.x-privat.org:

Yeah, nunya usual numpties here, that one's special. >:) Oh I am so punny today.

More comic relief. Not as amus>

You're probably right. I'll take a macro shot later. Interesting design.....The pot resistance with wipers installed is 10K. It's 33K without the wipers.

All indications are that this is a 10-turn 33K pot with only one wiper/ carrier installed. With two wipers it can be made to be < 10-turn with resistance < 33K depending where the wipers are placed (always equidistant from the ends).

I can see clearly now. The sharp lower values in the scope shots are due to the high wiper losing contact with the element leaving only the low wiper. Occassionaly, I saw positive going spikes/steps but couldn't figure out how that could happen if a single wiper lost contact with the element. Apparently, positive spikes/steps result when the low side wiper loses contact with the element leaving only the high.

If the winding cannot be seen by the naked eye then the wiper is probably shorting several turns, by design, at any given time based on the relative size of the wiper.

Actually, rapid turning back and forth cured the problem. That has always been my experience with WW pots. Probably oxide or crud buildup on the wire IMO. Trying to find a more proactive solution.

>

You are the dopey little bitch that made the ASSumption, chump!

What did your mother use to fry your genes with? Oh, that's right, you exited her colon at birth. You don't have genes.

There there...No need to beat yourself up, Archi..

I see you are now using google-groups. That's funny, as you've accused five other people of being complete morons for doing the same thing. Why the sudden change of heart?

mike

Reporting abusive poster. Complete message follows.

-=3D-=3D-

Path: = s03-b05.iad!npeersf01.iad.highwinds-media.com!npeer02.iad.highwinds-media= .com!news.highwinds-media.com!feed-me.highwinds-media.com!postnews.google= .com!k1g2000prl.googlegroups.com!not-for-mail From: Nunya Newsgroups: sci.electronics.design,sci.electronics.components Subject: Re: Inside a wirewound pot Date: Fri, 16 Jul 2010 08:24:55 -0700 (PDT) Organization:

Lines: 15 Message-ID: =

References: = =20 =20 NNTP-Posting-Host: 68.111.241.65 Mime-Version: 1.0 Content-Type: text/plain; charset=3DISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1279293895 11036 127.0.0.1 (16 Jul 2010 =

15:24:55 GMT) X-Compla> > First off, you dope... =3DA0nobody suggested a damned thing about =

YOUR

You are the dopey little bitch that made the ASSumption, chump!

What did your mother use to fry your genes with? Oh, that's right, you exited her colon at birth. You don't have genes.

Yes, you're right;

Maybe;

Provided the step you are referr>

Be gone hell fodder. Not fazed in the least by types like you.

>

This is a text discussion forum. If you were ever fazed by anything here, you should seek professional assistance. Or go to a dojo and learn how to cull away the wussy from your being.

I'm happier now that you explained how a 4V drop sneaked in there, two wipers bridging large section of element.

Element wound on thick enamelled copper wire? Think I may have opened a busted one some decades ago.

Grant.

Hi ARCHIE! You have been assessed.

Yes, you're right;

Maybe;

------------------ Ah! The large radius of the wiper contact, when even slightly worn, should bridge enough turns at once so ignore my comment re bounce.

I have no experience with multi wipers so I can't help you there. Art

Archi, Archi...Was there EVER a time you didn't pay for it? Does your mom KNOW where your allowance is going?

A twisted twit named MassiveProng was told by his Mom, "Come along... and cover your weeny it's just so teeny" "But Ma, the schlong's in sis' oblong"

mike