High voltage resistors are becoming more readily available with thick film
technology.
See
http://radionics.rs-online.com/web/sear
h/searchBrowseAction.html?method=getProductR=2509032292
A combination of these could meet the surge current requirement.
You need to be careful with
Well, there is laser trimming, and there is laser trimming.
For commodity resistors with leads and cylindrical bodies, a spiral cut is
fairly common. By varying the pitch of the spiral and number of turns, a
large number of values can be had from a single base part. This also
retains most of the
This reminds me of years ago when I did board level repair. Occasionally we
needed a resistor of some very specific value (bridge circuit) so we would
take a carbon film resistor of a slightly lower value and shave some of the
material off to get the exact value. A coat of epoxy finished the job.
Or, you could make a resistor by rubbing a
pencil on a piece of paper as was done in an
episode of the old Macgyver TV series :)
Scott B. Lacey
On 8 Oct 2008 at 12:35, Robert Richards
wrote:
This reminds me of years ago when I did board level repair. Occasionally we
needed a resistor of
I had a problem with surge blowing SMT resistors and found that the
parts were heavily 'trimmed' using the straight line cut method
described below. I sent the failed parts out for analysis and I have a
great SEM photo of the narrow amount of film that was left.
I found that Vishay makes a part
Hi Grace,
I ran into this issue too! Although the standard states very specifically that
it must be
the manufacturers name etc on the label, you can – by going through a TCB,
get the
label listed the way you describe.
Chas
From: emc-p...@ieee.org
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