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Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
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Old 2nd March 2016, 05:05 PM   #11
SGK is offline SGK
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If 90.9R and 1/4W is ok then these are available 71-SMM02040C9099FB30
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Old 2nd March 2016, 05:18 PM   #12
jackinnj is offline jackinnj  United States
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Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
Quote:
Originally Posted by SGK View Post
Hi. R117 is specified as 91 Ohms. Mouser stock all the required resistors except 91R. They do, however, stock 90.9R It would seem this is a useful substitute given the function of R117. Am I mistaken?

EDIT: although just as luck would have it Mouser are out of stock on the 90.9R until 25 April...
1000Ω||100Ω=91Ω
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Old 2nd March 2016, 07:16 PM   #13
soekris is offline soekris  Denmark
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Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
I'm also looking for a basic low noise preamplifier, but want balanced input.... Have searched the net without result, anybody know of something, diy or assembled ? Otherwise I probably need to make one myself....
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Old 2nd March 2016, 11:16 PM   #14
SGK is offline SGK
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Quote:
Originally Posted by jackinnj View Post
1000Ω||100Ω=91Ω
True but stacking two cylindrical components onto the same footprint is a finicky thing I'd prefer to avoid if possible. The 91R is there, I understand, to "tune" the gain to 60dB (while "measuring gain to an accuracy of much less than 1% is difficult"). 90.9R is within the 1% component tolerance of the 90R anyway. Maybe I am missing something...
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Old 3rd March 2016, 07:45 AM   #15
Samuel Groner is offline Samuel Groner  Switzerland
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I think a thin-film (not thick-film!) 1206 chip resistor should also fit, and is more easily sourced.

Samuel
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Old 3rd March 2016, 09:28 AM   #16
SGK is offline SGK
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Thanks. Mouser stock two in 91R 1206, both 1/4W.

91 Ohms 1206 Thin Film Resistors | Mouser

I'll try to get my parts order done today.
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Old 3rd March 2016, 09:35 AM   #17
hallodeletue is offline hallodeletue  Germany
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Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
The 91 ohm resistor is one of 11 paralleled resistors to form one leg of the 1Ω / 1 kΩ feedback network, and substituting 91Ω with 90,9Ω gives a calculated value of the combined resistance of 1.09771 Ω (91Ω) versus 1.09769Ω (90,9Ω). Negligable?

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hallodeletue
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Old 3rd March 2016, 10:31 AM   #18
deanoUK is offline deanoUK  United Kingdom
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Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
Quote:
Originally Posted by SGK View Post
Thanks. Mouser stock two in 91R 1206, both 1/4W.

91 Ohms 1206 Thin Film Resistors | Mouser

I'll try to get my parts order done today.
Hi SGK.

I am also building one of these.

Do you think there is much to be saved in buying two sets of components ?
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Old 3rd March 2016, 10:42 AM   #19
SGK is offline SGK
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TBH not really. Only if one were buying parts for, say, 10 or more boards would there be material savings. I have a Project set up on Mouser UK which I think I can share with you if you send me your email address. You can then "order project" android up counts or delete line items as suits. Buying just the parts needed costs about £35 so you get free delivery (vs paying £12). Of course in some instances it will make sense to round up the part count to, for example, 10 and add the spares to your parts box.
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Old 3rd March 2016, 11:14 AM   #20
deanoUK is offline deanoUK  United Kingdom
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Groner's Low noise measurement amp from Linear Audio vol 3 - spare boards?
Thanks. You have a PM.
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