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Old 24th March 2020, 10:34 AM   #11
Bonsai is offline Bonsai  Europe
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Rick, just down load the spreadsheet and enter the data for your chosen opamps to compare in the green cells
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Old 31st March 2020, 05:10 PM   #12
Bonsai is offline Bonsai  Europe
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I've made a few updates to the spread sheet and added graphs per Mark's suggestion. (2nd work sheet). Feel free to download it and test drive it. You can enter data for the devices you want to compare in the top left hand area - NB - only enter data in the GREEN cells.

The cartridge and signal level details are entered on the left hand side beneath the main table.

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Old 31st March 2020, 09:34 PM   #13
rsavas is online now rsavas  Canada
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That is really a cool spread sheet you have there. I did notice one thing that is strange.
The graph showing the "S/N ratio vs signal level" shows the LSK389 as being the worse of the lot.
However in the graph above it shows LSK389 to be slightly worse than the BF862, situated between the BF862 & the opamps.
I assume that if one puts two jfets in parallel that the "env" would be reduced by sq rt of 2? So for the lsk389 it would be 1.27/1.414 = 0.9 which is the same as the BF862?
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Old 1st April 2020, 06:07 AM   #14
Bonsai is offline Bonsai  Europe
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Hi Rick - yes that is correct. ). 2 in parallel got me to the figure in the green cell.

I got 1.9 nV/rt Hz at 1 kHz for the LSK389 off the data sheet.
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