Another newbie question
- Roy Tellason said :And maybe for dealing with really low-level signals, like audio preamps and
> Also,in general,the more precise your application, the smaller toleranceWhen I first started with electronics, 20% resistors would still be found in
> percentage you will want,typically 5% or 1%, meaning that the true value of
> the component will deviate from its rated value by AT MOST the tolerance
stuff. As well as really odd ways of marking the value with colored dots,
body color, etc. that you never see any more. Then 10% values became more
common, and these days 5% seems to be the norm, with 1% not being all that
uncommon any more, though most applications don't call for them.
And when you get right down to it, probably 80% or more of applications don't
even require 5% tolerance, they'll work just fine with a range of values in
there. When you start really looking at this stuff and find things like a 6
to 1 spread in transistor beta and similar, it's sometimes amazing that
stuff works as well as it does. :-) Clever engineering, I guess.
_____________________________________________________________________As Roy says,circuits with low-level signals,and for that matter any audio orvideo circuit would benefit greatly from using metal film resistors and relatively low tolerance ratings.You really want the least possible noise or junk being introducedinto audio or video circuits by low-quality components.On the other hand,for moregeneral and noncritical applications,then 10% tolerance carbon film resistors willdo just fine,and,if I remember correctly,Radio Shack has a very nice largeassortment of carbon film resistors for a very reasonable price.I think there aremaybe 500 in the pack and maybe 10% tolerance(not exactly sure I have thenumbers right,but it is a really good assortment of general purpose resistors).Sincerely, Jack G.
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