On 31 January 2013 04:28, Chris Albertson <albertson.ch...@gmail.com> wrote: > On Wed, Jan 30, 2013 at 6:16 PM, Richard (Rick) Karlquist > <rich...@karlquist.com> wrote: >> >> I know this topic has been discussed in the past on the list, but >> a colleague is asking if there are any off the shelf low >> noise power supplies for testing oscillators. Something >> a cut above an HP "brick" lab power supply etc. > > For once the "best" is also cheap: Batteries.
My first thought was that a battery was best. Obviously batteries will have a long term drop in voltage as the battery gets more depleted, but is there any short term noise from a battery? There is going to be thermal noise, but I wonder if some types of batteries are better from a noise perspective than others? Perhaps a number of batteries having the same nomilal voltage, capacity and internal resistance are all equal, but perhaps some are more equal than others! Dave Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
