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Date: Fri, 11 May 2007 14:50:31 -0700 (PDT)
From: James Maher <deltaflyer@prodigy.net>
Subject: Re: [FlyRotary] Re: EC2 question
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-2036769@logan.com>
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Al,
  I would be very careful about adding any tantalum capacitors.
  Back when I worked as an electronic technician I discovered the failure mode of these devices.
  They start off with a little leakage current.
  As they leak the get hotter.
  The hotter they get the more they leak.
  This continues until they build to critical temp and then explode
  sending a molten projectile 10 feet or more.
  I actually had some blowup while testing and they burnt a hole in the floor
  10-20 feet away.
After that I always made sure that there was a metal cover over the unit being tested.
  Just a word to the wise.
  Jim
  
Al Gietzen <ALVentures@cox.net> wrote:
    SNIP
   
  
47uf, 16V tantalum were added to each processor

Pin 8 of connector is now grounded.
Pin 28 of connector is now grounded.

Al


--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html



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<div>Al,</div>  <div>I would be very careful about adding any tantalum capacitors.</div>  <div>Back when I worked as an electronic technician I discovered the failure mode of these devices.</div>  <div>They start off with a little leakage current.</div>  <div>As they leak the get hotter.</div>  <div>The hotter they get the more they leak.</div>  <div>This continues until they build to critical temp and then explode</div>  <div>sending a molten projectile 10 feet or more.</div>  <div>I actually had some blowup while&nbsp;testing and they burnt a hole in the floor</div>  <div>10-20 feet away.<BR>After that I always made sure that there was a metal cover over the unit being tested.</div>  <div>Just a word to the wise.</div>  <div>Jim</div>  <div><BR><B><I>Al Gietzen &lt;ALVentures@cox.net&gt;</I></B> wrote:</div>  <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">  <div>SNIP</div>  <div>&nbsp;</div>  <div><BR>47uf, 16V
 tantalum were added to each processor<BR><BR>Pin 8 of connector is now grounded.<BR>Pin 28 of connector is now grounded.<BR><BR>Al<BR><BR><BR>--<BR>Homepage: http://www.flyrotary.com/<BR>Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html<BR></div></BLOCKQUOTE><BR>
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