[time-nuts] Lead acid battery noise levels

[David]

Its just over 10 years since I've used lead acid batteries as the lo 
noise power option for a low phase noise reference source use in the 
development of a jitter measurement instrument , we used discrete regs 
rather than  '317s etc, it worked fine but I can't pass on the details. 
I still have the reference without the batteries which went for 
recycling long ago, the possible new twist I've not seen noise data on 
is not batteries but Ultracapacitors intended for regenerative breaking:

http://www.maxwell.com/products/ultracapacitors/products/d-cell-series

It's nice to try something new and being new might be a way to sidestep 
environmental concerns.

Regards
David

> Message: 7
>
>Date: Thu, 11 Jul 2013 11:48:39 -0600 (MDT)
>From: "Don Latham"<djl at montana.com>
>To: "Discussion of precise time and frequency measurement"
>	<time-nuts at febo.com>
>Subject: Re: [time-nuts] Lead acid battery noise levels
>Message-ID:
>	<454263ca57f18f7fee4702b190662d3e.squirrel at webmail.montana.com>
>Content-Type: text/plain;charset=iso-8859-1
>
>But Hg batteries are So Moot! We're simply not allowed to have them or
>make them. Nanny won't have them in the house.
>I have a couple of Accutron clocks that would love to see a mercury cell.