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Re: "Enhanced" Drain Resistors :-))

Hi Dr. Resonance,

	I should have stated more clearly that this was a destructive test that
only determined how much headroom these parts had.  I did not mean to imply
that this was a good place to run them.  In the actual final design, they
will drop 1000 volts at 1/10 amp.  This type of destructive testing is
simply to insure that they will not arc at say 1050 volts.  Destructive
testing is good to be sure one isn't too close to the edge.  In this case I
have plenty of room in the design and I am now confident of this after the
destructive testing.  I was very surprised they went as far as they did!

	Terry



At 11:12 AM 5/23/99 -0500, you wrote:
>to: Terry
>
>Carbon and metallic film resistors are not rated at all for power
>applications.  You need to use carbon comp resistors for power applications.
>
>Regards,
>
>Dr.Resonance
>
>
>-----Original Message-----
>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
>Date: Sunday, May 23, 1999 3:05 AM
>Subject: "Enhanced" Drain Resistors :-))
>
>
>>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>>
>>Hi All,
>>
>>Reinhard wondered about the drain resistors I use being overloaded.
>>
>>I use YAGEO Carbon Film CR-50  1/2 watt 5% 10m Ohm resistors (Digi-Key
>>10MH-ND  $12.87/1000 ).
>>
>>I wired one across one of my 56nF 1600 volt caps and ran the voltage up.
>>At around 4000 volts it started to turn brown and smoke a little (~2
>>watts).  At 5300 volts, it gave a very nice CRACK!! and arced along its
>>outside surface!  It now measures as 11.1 Mohm.  I think they are pretty
>>good but obviously underrated :-))
>>
>> Terry
>>
>