[sdiy] really basic question .. tolerance

[Tim Ressel]

Rules... We don't need no stinkin' rules!

Let's do the math:

100 ohms +/- 1% --> +/- 1 ohm --> 99 to 101 ohms

in series, worse case: 99+99=198 or 101+101=202
which is +/- 2 ohms, which is 1% of 200 ohms

unequal values:

100 ohms 1% & 200 ohms 1%
100 ohms +/- 1% --> +/- 1 ohm --> 99 to 101 ohms
200 ohms +/- 1% --> +/- 2 ohm --> 198 to 202 ohms

in series, worse case: 99+198=297 or 101+202=303
which is +/- 3 ohms, which is 1% of 300 ohms

clear now?

--tim

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