[time-nuts] Lead acid battery noise levels - super caps
Robert Atkinson
robert8rpi at yahoo.co.uk
Fri Jul 12 11:36:55 UTC 2013
Interesting idea.
Capacity equates to about 115mAH (.310WH / 2.7V) and thats to zero output, so not an endurance option.
Robert G8RPI
________________________________
From: David <t_list_1_only at braw.co.uk>
To: time-nuts at febo.com
Sent: Thursday, 11 July 2013, 22:17
Subject: Re: [time-nuts] Lead acid battery noise levels
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.
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