> One of the issues Ed failed to mention is that you cannot economically
> purchase resistors for just any calculated value. Usually rounding up (or
> down) to the next common available resistor value is necessary. So,
> sometimes the precision value is not available, but it will be a safe,
> functional value.
> Gary Chudzinski
Gary brings up an interesting point for sure. Standard cheap resistors have a
5% tolerance. Thus, a so-called 100 ohm resistor could be anywhere between 95
and 105 ohms. For a few pennies more, resistors with a 1% tolerance can be
purchased. It is certainly possible to go to the ultimate extreme with
electronics just as with rivet diameters or tie spacing.
As Gary says, something close is perfectly usable even though not theoretically
ideal. Heck, even the bulbs and LEDs have tolerances on various
specifications. No point in stressing out over this stuff.
I'd rather run trains!
Cheers....Ed Loizeaux
www.Sscale.org
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