[time-nuts] Building a DMTD/phase noise set in the 21st century

[Bruce Griffiths]

Mine exhibit a series resistance of a few tens of milliohms and the added thermal noise was insignificant. The manufacturer claimed to use nanostructured carbon electrodes.
The leakage current was also small

Bruce
> On 30 August 2019 at 11:19 Gerhard Hoffmann <dk4xp at arcor.de> wrote:
> 
> 
> 
> Am 26.08.19 um 04:47 schrieb Bruce Griffiths:
> > I've only used an ultra low esr 33F supercap made in Korea in the source circuit of the input JFET on a preamp.
> > Down to 10Hz at least it didn't appear to add significant noise to the 4nV/rtHz @10Hz preamp.
> 
> I had bought some at DK, but 30 Ohms or worse at AC in the source 
> produce >700pV/rtHz alone.
> 
> That would add (geometrically) to the 300 pV/rtHz of one Interfet 
> IF3601/3602
> 
> and spoil the pot, so I stayed with the multiple electrolytics with 
> milliOhms.
> 
> regards,
> 
> Gerhard
> 
> 
> 
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