[sdiy] Odp: looking for high gain low noise preamp

[Roman]

I used to take SSM2018 for the job, but it's obsoleted now, probably for a long time...  It wasn't super low noise anyway, but maybe I was just too picky.   How more advanced design than just one specialized chip and couple of resistors? You may use parallel transistors to lower noise on input, and then feed it to opamp.  Or take a look at Analog Devices application note AN-136 back from past century, should give you some clues also.   Roman  Dnia 15 sierpnia 2018 03:49 Jean Bender <lofideadbeat at gmail.com> napisał(a):  Hi !  Would people here give me some advice for building à low noise high gain (70db) preamp ?  As it would be used with my LOM Instruments Priezor, it would be better if it was battery powered..  I'd like to use it with my old zoom h4..  I've looked After vlf antennas preamp but i don't think it would fit, and i'm à bit lost with what i've found on Google..  Any help or schematics Will be apreciated !  Best to all  J.   Le mer. 15 août 2018 02:28,  <   tprivitera at nc.rr.com > a écrit :  Thanks all for the tips.  Had to put the project aside for a little bit as things have gotten super busy at work.  Hope to dig in and troubleshoot more next weekend. Appreciate the guidance on where to look.      Tim   ---- Michael E Caloroso <   mec.forumreader at gmail.com > wrote:    > If the firmware is operating then it isn't the memory.      Battery is only an issue after power down.  If your patches don't save   correctly without powering down, then it isn't the battery.      More likely you have a bad IC in the multiplexing or demultiplexing system.      MC      On 8/13/18, Michael Zacherl <   sdiy-mz01 at blauwurf.info > wrote:   >   >> On 12 Aug 2018, at 19:16,    tprivitera at nc.rr.com  wrote:   >>   >> Maybe the battery?   >   > would be my first choice to check.   > only if battery, power supply voltages (under load!) etc. check out ok I’d   > look for patterns in the problem.   > otherwise further troubleshooting would be moot.   > m.   > ______________________________   > Synth-diy mailing list   >    Synth-diy at synth-diy.org   >  synth-diy.org synth-diy.org   >      ______________________________   Synth-diy mailing list      Synth-diy at synth-diy.org    synth-diy.org synth-diy.org            ______________________________   Synth-diy mailing list      Synth-diy at synth-diy.org    synth-diy.org synth-diy.org  ______________________________  Synth-diy mailing list   Synth-diy at synth-diy.org  synth-diy.org synth-diy.org
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