Re: EOL's

["ABLE_1" <able1no@xxxxxxxxxxxxxxxxxx>]

Correct Robert, I don't remember the tolerance band on this particular
resistor but I believe it to have been a 10% Silver.  That would mean it
would have had a high range of 4.114k but it was at 5.86k that would be
56.7% increase in value.  We will never know what happened to have changed
it so drastically.


"Robert L Bass" <sales@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:eb6ev1h97at7kufj9b3amplqddkrkuemuu@xxxxxxxxxx
>> If you begin with a resistor with a 20% tolerance (no tolerance band),
>> and with some age and heat, the carbon in it can change it's
>> resistive/conductive properties...
>
> No Al.  That is not correct.  Tolerance is a measure of the
> precision of the resistor in manufacturing.  It does not mean
> that the resistor will change over time.
>
> Resistors are never made to the exact value indicated by the
> color codes.  Manufacturers use the tolerance color band to tell
> you just how accurately the resistor was made.  It is a
> measurement of the imperfections.  Gold = within 5% of dead-on.
> Silver = within 10%.  In other words, the tolerance band
> indicates the range of possible values that a given resistor may
> have.  For example, a resistor with three red bands and one gold
> band is rated at 2200 Ohms but it can actually read anywhere from
> 2090 to 2310 Ohms.  Whatever its value was when made, it will
> remain at that same value permanently.
>
> To determine the exact range that the resistor may be, take the
> value of the resistor and multiply it by 5%, 10%, or 20% for
> gold, silver or no tolerance band, respectively.
>
>> If you really want to control this better, try either 10% tolerant
>> resistors (silver tolerance band) or better yet 5% (gold tolerance
>> band) resistors.
>
> The above statement is based upon a misunderstanding of resistor
> tolerance.
>
> If you really want to be picky, use 5-band resistors but have fun
> finding an alarm manufacturer that supplies them.  3-Band and
> 5-band resistors do exist, though they're not appropriate for use
> in alarm circuits.
>
> It is highly unlikely that the gentleman has a 20% tolerance
> resistor but even if he did that would not mean that the carbon
> is more likely to change value.
>
> --
>
> Regards,
> Robert L Bass
>
> Bass Burglar Alarms
> The Online DIY Store
> http://www.BassBurglarAlarms.com
>
> --
>
> Never underestimate the power of very stupid people in large
> groups.