[time-nuts] Low noise power supply recommendations

[Bob Camp]

Hi

Ni-cads are pretty low noise, reasonably stable, and close to the per cell voltage of the mercury cells. The gotcha is the self discharge rate. If you don't need a floating supply I suspect you can build up a " good enough" linear regulator to get things working.

Bob



On Jun 14, 2011, at 8:12 PM, "Will Matney" <xformer at citynet.net> wrote:

> Bob,
> 
> I've thought about that, and also thought about the 24 volt battery packs
> used in those Schwinn scooters the kids have. I can buy a 24 volt charger
> cheap for those, but the batteries run about $60.00 each plus shipping, and
> they are probably rated at around 4 amp hours, I think. It may be the way I
> go, since I think they are Ni-Cad instead of lead-acid. The problem is, I
> wonder what type of noise any voltage regulators will cause in the circuit?
> 
> Thanks,
> 
> Will
> 
> *********** REPLY SEPARATOR  ***********
> 
> On 6/14/2011 at 8:01 PM Bob Camp wrote:
> 
>> Hi
>> 
>> Ni-cads are a pretty good bet.
>> 
>> Bob
>> 
>> 
>> 
>> On Jun 14, 2011, at 7:02 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
> lead-acid
>>> batteries in series, and making a charging circuit with regulators, but
> I
>>> 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
> batteries
>>> in series for 3 volts. Any help and or ideas would be appreciated.
>>> 
>>> Thanks
>>> 
>>> Will
>>> 
>>> 
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