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Measuring low noise
Measuring low noise
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Old 8th September 2008, 01:38 PM   #31
jackinnj is offline jackinnj  United States
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Measuring low noise
Default Re: Re: Measuring 1/F noise

Quote:
Originally posted by scott wurcer


I once went down to 11 micro-Hz with one of those characterizing current noise.

At 11uHz can't you just see the little critter comin' and whack it with a shovel?
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Old 9th September 2008, 01:03 AM   #32
unclejed613 is offline unclejed613  United States
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let's see..... that's 90,000 seconds of averaging time.......
just over a day...
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Old 4th March 2014, 01:14 PM   #33
jackinnj is offline jackinnj  United States
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Measuring low noise
Quote:
Originally Posted by scott wurcer View Post
For maximum versatility you could use an instrumentation amplifier. There are many already available or you could build this little circuit. The FET's need to be matched or you need a big AC coupling cap in series with the gain resistor which goes between the sources of the input FET's.
I wonder if you've given more thought to that circuit (post 17) after writing up the two-part Linear Audio articles on microphone preamplifiers. I've built a couple versions with both BF862 and K170 and an LME49720 opamp.

I recommend the transistor matching device you showed in the LA article.
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