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Entry  Fri Nov 10 18:57:41 2017, rana, Summary, Electronics, Ithaca 1201 vs. SR560 Ithaca1201.pdf
    Reply  Sun Dec 31 12:43:50 2017, rana, Summary, Electronics, SR560: reworking Preamps.pdf
       Reply  Mon Jan 8 20:50:01 2018, rana, Summary, Electronics, SR560: reworking 
Message ID: 13516     Entry time: Mon Jan 8 20:50:01 2018     In reply to: 13494
Author: rana 
Type: Summary 
Category: Electronics 
Subject: SR560: reworking 

I replaced the NPD5565 with a LSK389 (SOIC-8 with DIP adapter). There was a noise reduction of ~30%, but not nearly as much as I expected. I wonder if I have to change the DC bias current on these to get the low noise operation?

https://photos.app.goo.gl/hsMwsif7NLscsgpx1

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