14:29 <d1b2> <transorbs> @daveshah true, not even for values but for tolerances :)

14:30 <d1b2> <transorbs> I guess you can't really get a /worse/ tolerance by combing resistors, but you can get better tolerances!

14:30 <d1b2> <daveshah> Not a better tolerance, but a narrower confidence interval

14:31 <d1b2> <daveshah> In theory all the resistors could be 5% high or low, for example (particularly if they come off the same reel, in practice)

14:31 <d1b2> <transorbs> ? What is the difference between tolerance and confidence interval?

14:32 <d1b2> <daveshah> Tolerance is a hard limit, aiui

14:32 <d1b2> <transorbs> I thought if you have a gaussian distribution tolerance, then combining resistors reduces the tolerance

14:32 <d1b2> <daveshah> You reduce the probability that it is outside that range

14:33 <d1b2> <transorbs> Ahhh, fair

14:40 <whitequark> daveshah: last time this came up i looked around and turns out some people actually tested resistors in bulk

14:40 <whitequark> it seems like they are not binned after all

14:40 <whitequark> maybe laser trimming makes that pointless

14:41 <d1b2> <daveshah> I've seen other tests where it looked like there was a hard cut off at about half of tolerance (so +-2.5% ish for 5% resistors) presumably to allow for aging/temp/whatever

14:41 <d1b2> <daveshah> but that was a while ago

14:45 <whitequark> interesting

21:11 <_whitenotifier-b> [GlasgowEmbedded/glasgow] electroniceel pushed 1 commit to wip-revC2 [+0/-0/±2] https://git.io/JJLre

21:11 <_whitenotifier-b> [GlasgowEmbedded/glasgow] electroniceel 0895c15 - revC2: save one BOM line by replacing a 220k resistor against 2x 100k

21:12 <_whitenotifier-b> [glasgow] electroniceel synchronize pull request #196: WIP revC2 - https://git.io/JfXxO

21:22 <_whitenotifier-b> [glasgow] Success. The Travis CI build passed - https://travis-ci.org/github/GlasgowEmbedded/glasgow/builds/705560681?utm_source=github_status&utm_medium=notification

21:51 <_whitenotifier-b> [glasgow] Failure. The Travis CI build failed - https://travis-ci.org/github/GlasgowEmbedded/glasgow/builds/705560657?utm_source=github_status&utm_medium=notification