I just found something funny. I have been thinking "clean" power supplies that
connects to AC mains. Then I thought, what about lead acid batteries?? So I
went to my lab and took some measurement. This is a 12V 7A lead acid sealed
battery, the kind commonly found on UPS devices.
The result?
Hi
> On Dec 24, 2019, at 6:40 AM, Poul-Henning Kamp wrote:
>
>
>
>> That again depends on topology and control type. The canned converters
>> are almost always optimized to have the lowest number of switches and
>> work with cheap magnetics (single coil) without easily entering
>That again depends on topology and control type. The canned converters
>are almost always optimized to have the lowest number of switches and
>work with cheap magnetics (single coil) without easily entering
>problematic operation modes, noise is only a secondary concern.
That
Am 23.12.2019 um 16:03 schrieb jimlux:
It is tough to build a "small" input filter that has good rejection at
low frequencies (<100kHz?)
Yes if you want a passive filter, but you can view an LDO as an active
low-pass in some sense. Again you need to take care that noise cannot
bypass it,
On 12/23/19 1:08 PM, Charles Steinmetz wrote:
I wrote:
> To get even that far, one needs multiple shielding
> (see list member Gerhard Hoffman's construction photos for ideas)
John wrote:
Being a relative newcomer here, how do I search the archives for a
specific author's input? I found
On 12/23/19 10:17 AM, Taka Kamiya via time-nuts wrote:
I think the conversation is going into an area way beyond my initial intent.
My goal is to have a "good enough" source for 24V to run multiple time sources.
Yesterday, I measured the output of switcher I've been using for testing purpose
I wrote:
> To get even that far, one needs multiple shielding
> (see list member Gerhard Hoffman's construction photos for ideas)
John wrote:
Being a relative newcomer here, how do I search the archives for a specific
author's input? I found some random posts from Gerhard but I don't see
I think the conversation is going into an area way beyond my initial intent.
My goal is to have a "good enough" source for 24V to run multiple time sources.
Yesterday, I measured the output of switcher I've been using for testing
purpose only. Holy cow it's dirty! 120mV peak-to-peak wide band
Date: Mon, 23 Dec 2019 07:51:49 -0500
From: Charles Steinmetz mailto:csteinm...@yandex.com>>
To: time-nuts@lists.febo.com<mailto:time-nuts@lists.febo.com>
Subject: Re: [time-nuts] Power supply for time source concerns
Message-ID: <5e00b865.4000...@yandex.com<mailto:5e00b865.
On 12/23/19 5:42 AM, Bob kb8tq wrote:
Hi
If you dig into the app notes on the LT304x parts after a lot of extolling the
wonders and virtues, they eventually get into magnetic coupling between the
“upstream” and “downstream” bypass components. Taking care of that with
proper layout is possible,
Hi
If you dig into the app notes on the LT304x parts after a lot of extolling the
wonders and virtues, they eventually get into magnetic coupling between the
“upstream” and “downstream” bypass components. Taking care of that with
proper layout is possible, but non-trivial.
Is milivolts of
On 12/23/19 5:01 AM, Achim Gratz wrote:
Am 22.12.2019 um 20:37 schrieb Taka Kamiya via time-nuts:
> Most commercially manufactured time and frequency sources use
> switching power supply.
[...]
The suggestion to "just use a linear power supply", especially if it was
designed some decades ago
Jim wrote:
LT3042 removes 60-80 dB up to 10MHz. 20V, 200mA
https://www.analog.com/media/en/technical-documentation/data-sheets/3042fb.pdf
Achieving 60-80 dB in practice with typical DIY printed circuit layout
and construction (by this I mean amateur PCB layout, typical board-house
Am 22.12.2019 um 20:37 schrieb Taka Kamiya via time-nuts:
> Most commercially manufactured time and frequency sources use
> switching power supply.
[...]
The suggestion to "just use a linear power supply", especially if it was
designed some decades ago is probably not getting the desired
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
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.
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
Back when I used to accumulate time nuts gear, I also used to accumulate
various linear power supplies (mostly surplus / used HP lab supplies.).
Approx 10 years later I should probably should look at the noise levels,
regulation etc again.
I also have a 24 volt lead acid battery system for
Hi
Each project is a different “experience”. Some things are way more susceptible
to switching noise
than others. Some switchers put out way more noise than others. You would not
run a linear supply
on a computer. The low noise front end of a radio is going to need a quiet
supply …..
There
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
Most commercially manufactured time and frequency sources use switching power
supply. However, when contacted, tech support for SRS says, in regards to
PRS-10, use linear power supply. I am guessing, when manufacturers design
complete units, they take switching noise into consideration and
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