[time-nuts] Low noise power supplies?

[David Kirkby]

On 31 January 2013 04:28, Chris Albertson <albertson.chris at gmail.com> wrote:
> On Wed, Jan 30, 2013 at 6:16 PM, Richard (Rick) Karlquist
> <richard at 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