My version of the G = 1000 low noise measurement amp (for Ikoflexer). - Page 3 - diyAudio
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Old 2nd November 2016, 12:31 AM   #21
cwtim01 is offline cwtim01  Hong Kong
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Another one is made, thanks Scott for the circuit and Patrick for the PCB design

Attached (second picture) the ARTA measurement of the noise level (gain is set to 1000 in ARTA). Yellow one is when input was shorted at the BNC, green one is when input was connected to a 1k resistor. The 1k resistor should have a noise of 4nV/rtHz, with the yellow line being 14dB lower, this amp should have a noise of 0.8nV/rtHz if my computation is right.

To get a clean graph, I had to hide it within another grounded metal box, last graph is measurement of the 1k resistor (green) without the extra metal box, where the aluminum case is already grounded.
Attached Images
File Type: jpg Wurcer_LNA_1.jpg (66.6 KB, 360 views)
File Type: png LNA Noise.png (23.1 KB, 355 views)
File Type: jpg Double shielding.jpg (53.0 KB, 345 views)
File Type: png LNA Noise 2.png (53.4 KB, 343 views)
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Old 2nd November 2016, 12:42 AM   #22
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You guys are very welcome, I'm glad I could help. That's some nice measurement of a 1K resistor.
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Last edited by scott wurcer; 2nd November 2016 at 12:58 AM.
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Old 2nd November 2016, 01:30 AM   #23
EUVL is offline EUVL  Europe
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Patrick
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Old 23rd November 2016, 10:38 PM   #24
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That is indeed some nice work - well done!
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Old 24th November 2016, 12:07 PM   #25
EUVL is offline EUVL  Europe
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We have been asked by PM about PCBs.

We have some left, and you can have them for HKD100 each including Paypal fees, packing and registered post.
But it will make life easier for us to pack and send them in one go (sort of GB).
So those interested please make a list of subcribers here.
We'll wait 3 weeks or so before closing and giving you further instructions.


Thank for your interest,
Patrick
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Old 24th November 2016, 01:59 PM   #26
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by cwtim01 View Post
Another one is made, thanks Scott for the circuit and Patrick for the PCB design

Attached (second picture) the ARTA measurement of the noise level (gain is set to 1000 in ARTA). Yellow one is when input was shorted at the BNC, green one is when input was connected to a 1k resistor. The 1k resistor should have a noise of 4nV/rtHz, with the yellow line being 14dB lower, this amp should have a noise of 0.8nV/rtHz if my computation is right.

To get a clean graph, I had to hide it within another grounded metal box, last graph is measurement of the 1k resistor (green) without the extra metal box, where the aluminum case is already grounded.
the 2 box screening makes a big difference.
I have seen others suggesting the 2 box method and they used different materials for the two boxes, one included Fe for better magnetic coupling screening.
Is your black box aluminium, or steel?
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Old 24th November 2016, 02:00 PM   #27
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by EUVL View Post
We have been asked by PM about PCBs.

We have some left, and you can have them for HKD100 each including Paypal fees, packing and registered post.
But it will make life easier for us to pack and send them in one go (sort of GB).
So those interested please make a list of subcribers here.
We'll wait 3 weeks or so before closing and giving you further instructions.


Thank for your interest,
Patrick
Put me down for 1 PCB
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Old 24th November 2016, 02:03 PM   #28
cwtim01 is offline cwtim01  Hong Kong
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Quote:
Originally Posted by AndrewT View Post
Is your black box aluminium, or steel?
Steel, it's a box for storing coins, but it's handy for a quick test.
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Old 24th November 2016, 02:08 PM   #29
EUVL is offline EUVL  Europe
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Please note that this is Scott's circuit.
We built it as is, and have proven that it works.
So we shall only publish a BoM that corresponds to the PCB (and Scott's schematics).
If you have detailed technical questions, there is no better person to ask than the inventor himself.

Patrick
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Old 24th November 2016, 02:09 PM   #30
EUVL is offline EUVL  Europe
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Please help us by adding to the list yourelves.

AndrewT UK 1x


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