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 <dk...@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 > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
