Nick Palmer wrote: > Paul wrote:- > <<You should read about different types of noise --> > > http://www.aikenamps.com/ResistorNoise.htm >> > > Well, I read this webpage. Maybe you misunderstand. When they say > > <<The thermal noise of a resistor is equal to: > Vt = SQRT(4kTBR) > > where: > > Vt = the rms noise voltage > k = Boltzmann's constant > T = temperature(Kelvin) > B = noise bandwidth > R = resistance >> > > you are taking this to mean that the noise voltage is generated solely > by the temperature of the resistor whether or not there is a current > flow and this is what the equation seems to suggest; however, this is a > sound engineer's equation, not a physicist's. I think it means that if > the resistor is ACTUALLY resisting current, then the noise voltage is > dependent upon temperature and the "shot noise" depends upon the > current. I put it to you that when there is no current though the > resistor, there is no electrical noise at all. Still no free lunch.
I will bet you ***any*** amount of money you are wrong, that thermal noise does indeed generate a voltage noise without applying any external voltage to generate current. Hopefully that will put an end to this silly conversation. :-) Any *real* EE or physicists knows for fact thermal noise generates voltage noise due to thermal vibrations.
If you want to see thermal noise then get a low noise amp and connect it to a large resistor.
There is free lunch for *intelligent* thinking beings. :-) Regards, Paul Lowrance
