[time-nuts] Low noise power supply recommendations

Will Matney xformer at citynet.net
Wed Jun 15 00:05:30 UTC 2011


No, actually, I need both. They used the mercury battery over its ability
to hold the voltage steady over its charged cycle, which was something they
did pretty well. It's a shame they've really not made anything to match
them yet, except I've heard of folks using Lithium in their place. I think
when they banned mercury cells, it helped with the slow death of Burgess
battery, since they produced a good majority of them.

The only battery supply that wouldn't have had good regulation, would have
been the 3 volt supply using the two AA batteries. The 7 volt, and the 24
volt both used the mercury types. Actually, I think they used 12 and 24 Vdc
off the two large mercuries, using the center tap for the 12 volt.

This is the supply for a very precise Vishay bridge measuring network. They
used a standard line power supply for everything but the supplies feeding
the bridge itself. The batteries gave a clean supply voltage, and the
mercury type batteries gave the regulation over standard carbon, etc..

I'll take a look at the link on the supplies, and thaks for that.


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On 6/14/2011 at 4:46 PM Chris Albertson wrote:

>I was just looking at battery noise last week.   I assume you need low
>noise, not good regulation. If so then in practical terms, I think the
>best thing you could do is get an 8 cell battery holder for AA cells
>then connect a 220 uF capacitor across it.
>This is pretty good. has test results for several power supplies
>On Tue, Jun 14, 2011 at 4:02 PM, Will Matney <xformer at citynet.net> wrote:
>> Hello,
>> I am in need of a very clean 24 Vdc power source, to replace some old
>> mercury cell batteries with. What would a good low noise, clean, power
>> supply be in your recommendations? I thought of using two 12 Vdc
>> batteries in series, and making a charging circuit with regulators, but
>> am hoping to purchase a good used supply off ebay, etc. The old circuit
>> used two 12 Vdc snap terminal mercury batteries in series, for 24 Vdc,
>> along with a 7 Vdc mercury cell, and two plain AA carbon 1.5 Vdc
>> in series for 3 volts. Any help and or ideas would be appreciated.
>> Thanks
>> Will
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>Chris Albertson
>Redondo Beach, California
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