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In Reply to: Resistor noise on AUDIO applications posted by megalomaniac on November 27, 2010 at 18:51:05:
"On the other hand, I understand that CONTACT NOISE (FLICKER NOISE), the other type of noise present on resistors, is dependent on resistor material/size and average *DC* current. But most applications of resistors in solid-state audio circuits SEE NO DC."
I think I see your point of confusion. They specify excess noise in resistors using a fixed DC current simply to force a known condition for measurement and specification. Unfortunately that doesn't mean that the problems only occur at DC, it occurs just as readily with signal currents.
"Excess noise" gets it's name because it's in excess of the unavoidable thermal noise voltage present in every conductor this side of absolute zero. While thermal noise is a function of the temperature, resistance and bandwidth, excess noise is usually due to various sorts of material and structural imperfections and up to a point you can make a cost/noise tradeoff. For instance metal film resistors are a lot quieter than carbon film or comps and only cost a little more. But once you get to where you can't hear it or thermal noise becomes dominant you're done.
Have fun...
Rick
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- RE: Resistor noise on AUDIO applications - rick_m 15:03:56 11/28/10 (0)
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