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Old 13th August 2005, 06:18 PM   #11
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I reworked the preamp design with SSM2019 and choice of two filters. The first filter allows 100mHz to 10 Hz noise measurement, the second (adapted from Linear Tech's apnote 83) has a 10Hz - 100kHz bandwidth. Note the inductors and fusing on the inputs. The SSM2019, at least according to the folks at Analog, has protection clamp diodes on the inputs. I found that they failed. C9 is actually 22uF:

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Old 27th March 2008, 07:11 AM   #12
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I was looking for a noise measurement amp and came across this old thread. While the SSM2019 is OOP, the THAT1510 is a drop in replacement (with reputedly better performance) and can be had in small quantities from http://www.ka-electronics.com/kaelectronics/index.html I'm in no way associated with KA, except as a satisfied customer.

It appears that the pcb layout has disappeared from the tech-diy site. Does anyone have a copy archived?

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Paul
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Old 27th March 2008, 12:47 PM   #13
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You could also use AD797 powered from two 9V batteries.

http://tangentsoft.net/elec/lnmp/
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Old 27th March 2008, 12:58 PM   #14
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Quote:
Originally posted by spzzzzkt
I was looking for a noise measurement amp and came across this old thread. While the SSM2019 is OOP,
The SSM2019, according to Analog's site, is still in production. It's the SSM2017 which Walt and Jan used for their 1995 Audio Amateur articles that is out of production.

One of the things which I learned (the hard way) was that you need an automatic mechanism to "precharge/discharge" the blocking capacitors -- this is done manually on the Tektronix 7A22 and 5A22 differential amplifiers. I've used the amplifier to measure the noise on a couple of high voltage regulators (the Maida regulator, Last PAS and LR8N3).

I would also use a front-end for the amplifier consisting of a low noise JFET preamp...and the power supply should be contained in a separate box, or some NiCads used to power the device.

For audio, you might want to take a look at my article in AX "The Noise (Analysis) Machine" -- I describe the use of Linear Tech's True RMS Detectors, and rebuilt the filter used by Dolby for his article.
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Old 27th March 2008, 02:06 PM   #15
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I have tried to search without any success. Jack, do you have a link maybe?
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Old 27th March 2008, 09:36 PM   #16
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Quote:
Originally posted by jackinnj
The SSM2019, according to Analog's site, is still in production. It's the SSM2017 which Walt and Jan used for their 1995 Audio Amateur articles that is out of production.
My bad, the ssm2019 is still in production. I have a handful of the THAT1510 spare from a Walt Jung designed mic-pre I put together and which used the '17. The 1510 is a drop in replacement for the SSM2017. For some reason I was thinking it had used the '19.
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