impedance comverter

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yukanti
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impedance comverter

Post by yukanti » Tue Feb 15, 2005 10:32 am

hallo...<p>need help (again) in designing an IMPEDANCE CONVERTER. now i'm making a active filter that consits High-Pass, Low-Pass, Band-Pass Filter.
An Impedance Convertr is required on that modul.... <p>thanks

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Chris Smith
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Re: impedance comverter

Post by Chris Smith » Tue Feb 15, 2005 1:04 pm

They have a slide rule type of calculator for the task, and Im sure its computerized by now. <p>Check with the manufactures of chokes and coils?<p>I got my free cardboard slide rule back many years ago. Very handy.

russlk
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Re: impedance comverter

Post by russlk » Tue Feb 15, 2005 3:16 pm

There are circuits that use a capacitor to simulate an inductor and vice-versa. Is that what you mean by "impedance converter"?

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jwax
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Re: impedance comverter

Post by jwax » Wed Feb 16, 2005 3:28 am

yukanti- We need details!
:eek:

Bernius1
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Re: impedance comverter

Post by Bernius1 » Wed Feb 16, 2005 3:38 am

Maybe a novice reply, but;
what about a transformer? Maybe wind your own. 100 turns of 22AWG with 110 turns of 32AWG over that, on a ferrite rod.
I will now turn on the light to see what I shot.
Can't we end all posts with a comical quip?

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philba
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Re: impedance comverter

Post by philba » Wed Feb 16, 2005 8:37 am

I'm with jwax - details. He could mean an impedence matcher or something more sophisticated. <p>A great answer to the wrong question is a wrong answer!

Ron H
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Re: impedance comverter

Post by Ron H » Wed Feb 16, 2005 11:45 am

My guess is he's looking for a negative impedance converter.

terri
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Re: impedance comverter

Post by terri » Wed Feb 16, 2005 10:40 pm

As it appeared in another topic:<p> <blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>
Sorry, but I said it and I still ain't takin' it back:<p>What is the real problem?<p>And I see this kind of thing all over this board:
"I've got a nitzifez. What can I do?" And it is five
ten, fifteen posts later that the real problem
finally emerges, only after a whole bunch
of "Yeah, buts" from the initial poster.<p>While I recognize that sometimes it is not possible
to state a problem clearly at the outset --maybe there
are too many variables involved and they have to
be sorted out first, but to me, at least, that is
the first job of the poster --to sort out the
variables. And I will guarantee
that about half the time, if the poster starts
sorting out some of these variables, not only
will a more clear statement of the problem
emerge, but the solution as well!<p>As George Zimmerman says, "I guarantee it."
<hr></blockquote><p>[ February 16, 2005: Message edited by: terri ]</p>
terri wd0edw

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philba
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Re: impedance comverter

Post by philba » Wed Feb 16, 2005 10:57 pm

The problem with long, detailed question posts is that they seldom gather many responses. I'd guess that people see a long post and mentally go "Next!".

terri
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Re: impedance comverter

Post by terri » Thu Feb 17, 2005 9:25 pm

You're probably right, regrettably. See the AC motor speed topic. I answered on the reasonable basis that the querent was doing some machining with a fly cutter. Silly me! I should have read the querent's mind and realized that he was really slicing termite mounds.<p>But of course! Silly me! I should have known!<p>Where's my effing Tarot deck?
terri wd0edw

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philba
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Re: impedance comverter

Post by philba » Fri Feb 18, 2005 9:53 am

funny, I though he was building a torture machine to use on a younger sibling...<p>[never ever thought about that when *I* was young... :eek: ]

terri
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Re: impedance comverter

Post by terri » Fri Feb 18, 2005 7:09 pm

It took you to point it out, but come to think of it, it does sound kind of essy and emmy.<p>Eeek!<p>================<p>Now, wouldn't it have been easier all around if the query looked something like this?<p>
TASK: Develop, find, or modify a variable-speed AC motor (1/2 to 3/4 HP) whose torque will be the same regardless of RPM in driving a large disc cutter. <p>APPLICATION: Slicing sections of termite mounds encased in plaster for scientific measurements of diameters, composition, etc. Maximum diameter of termite mound XX.X cm. Maximum height YY.Y cm. Termite mounds consist of termite-saliva-bound grains of sand and small pebbles. <p>PROBLEM/QUESTION: We are having difficulty in driving an AC Motor at variable RPM with sufficient torque to do the cutting. How can we do this without using feedback circuits? (Note: type of motor tried was not specified, i.e., induction, universal.)<p>=================<p>Yes?<p>No?<p>How would you have answered if the querent had posed the question that way?<p>[ February 18, 2005: Message edited by: terri ]</p>
terri wd0edw

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