On 12/22/19 3:16 PM, Taka Kamiya via time-nuts wrote:
Yes.....
I considered float charging a battery bank and switching power supply + linear
regulator combination as well.
Concern with the first is safety in charging. I was intending to use GEL cell
lead acid battery. 24V chargers are plentiful but there is no telling what
they actually do. Adding a series regulator won't work because of the required
voltage drop with most of the 3 terminal kind. I still want to try this as it
will double as UPS as well.
Switcher + linear regulator sounds promising. One unknown is, how much high frequency ripples/noises those regulators actually remove.
LT3042 removes 60-80 dB up to 10MHz. 20V, 200mA
https://www.analog.com/media/en/technical-documentation/data-sheets/3042fb.pdf
CHeck out also the LT3045 (500 mA)
LT3093, LT3094 (negative voltages, 200, 500mA, 0.8 uV noise)
I guess I'll just have to try this out. Ferrite sleeves, low pass
filters, chokes, etc, etc, etc are under consideration.
I have a very nice lab grade switching power supply but unfortunately, this
stupid thing resets to ZERO every time power cycled and starts up in current
limiting mode. Meaning if I forget to switch modes, it can go as high as 60
volts. By then, all devices are GONE!
My main usage will be just for time standard for my lab. Stable 10MHz and 1
pps is all I need to sync everything up. I am not going to multiply output to
GHz range or do anything else exotic. I wonder how much ripple will actually
affect?
---------------------------------------
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Sunday, December 22, 2019, 6:00:32 PM EST, jimlux
<jim...@earthlink.net> wrote:
On 12/22/19 1:18 PM, Poul-Henning Kamp wrote:
--------
In message <1958104416.2586171.1577043445...@mail.yahoo.com>, Taka Kamiya via t
ime-nuts writes:
First question to the group is, how do YOU manage this problem?
It used to be that there were only one kind of switching power-supply: The
noisy ones.
That is no longer true by definition, but there is no easy road to this
particular Damascus.
My strategy is DC/DC converter to get close, and high PSRR LDO linear
regulator to the final voltage. Close attention to the DC/DC converter
input and output so you don't couple to the ultimate output through
radiated or parasitic conducted paths.
The LT3042 series regulators have high PSRR, are available with negative
voltages now, and can be paralleled for more current capacity.
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