[sdiy] looking for high gain low noise preamp

[Jean Bender]

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.
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