[time-nuts] Low noise power supply recommendations

WB6BNQ wb6bnq at cox.net
Wed Jun 15 01:13:13 UTC 2011

Hi Will,

You could consider building your own power supply system for the replacement of
the batteries.  Use a separate power transformer which, I suspect, would be small
as the current requirements would be low for driving a bridge circuit.

The main company to look toward for high quality, low noise regulators is Linear
Technology.  Here is a candidate part to look at :

This is the lowest noise (33uv/10Hz to 100KHz) low dropout regulator that can
handle regulating 24 volts and is adjustable, meaning use can use this part for
all three voltages (i.e., three regulators).  You will have to decide if it noise
specs are suitable for your needs.  Keep in mind that battery noise is typically
random whereas the noise out of a regulated system tends to be constant.

If you really think you need lower noise then you could consider an LT1000 shunt
reference.  Typically the circuit designs for LT1000 type devices are as
references and lack current capability above about 10 milliamps.  Adding
additional current circuitry would add more noise.  See:



Will Matney 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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