Re: Choke Resistor

To: tesla-at-poodle.pupman-dot-com
Subject: Re: Choke Resistor
From: Tesla List <tesla-at-stic-dot-net>
Date: Thu, 29 May 1997 07:57:32 -0500
Approved: tesla-at-stic-dot-net

Subject:     Re: Choke Resistor
      Date:  Wed, 28 May 1997 08:11:03 EDT
      From:  wb8jkr-at-juno-dot-com (Mark S Graalman)
        To:  tesla-at-pupman-dot-com
References:  1


On Mon, 26 May 1997 23:00:19 -0500 Tesla List <tesla-at-pupman-dot-com> writes:
>Subject:   Choke Resistor
>  Date:    Mon, 26 May 1997 05:48:40 -0700 (PDT)
>  From:    gweaver <gweaver-at-earthlink-dot-net>
>    To:    Tesla-at-pupman-dot-com
>
>
>I found several large wire wound power resistors at the scrap 
>yard and bought them all for $1.50.  I have 4 that are rated 
>800 ohms .56 amps.  Sence these resistors are wire wound just 
>like a choke is wire wound they should work as chokes also.  
>I can use them a damping resistors and also as choke coils on
>the high voltage terminals of my large transformer.  There is
>only one problem, they are not round, they are not flat either,
>they are oval shaped.  They measure 2" wide, 3/4" thick, 12" 
>long. Does anyone think the shape will be a problem and cause 
>them not to work as a choke.  If I had some test equipment I 
>could probably test them to see if they will work as chokes.  
>Has anyone tried using wire wound resistors as chokes?
>
>Gary Weaver
>
>
    Gary, The shape won't hurt anything. But I wouldn't use "just" the
resistor as a choke there wouldn't be enough inductance to cause
proper choke action. The main idea behind the series resistor with a
choke is to "DE-Q" the choke in order to prevent it from ringing.

  What you could try maybe is inserting a couple ferrite rods inside the
resistor, but it would most likely be easier to just use a regular 25 to
50 watt wire wound and a decent toroidal choke.


                        Mark Graalman