[time-nuts] Using a common power supply among few time standards

[Askild]

Hi Bert,

Make sure to measure the noise on the Traco (on both input and output)
We had some issue with noise from a couple of Traco models at work. We
changed to Mean Well, and much less noise....

Br,
Askild

On Sat, Feb 8, 2020 at 8:10 PM ew via time-nuts <time-nuts at lists.febo.com>
wrote:

> Just got this in the mail I am sure they have related items.
> We use with very good results Mean Well SD DC/DC products, for my Rb 8607
> project I plan on using Traco Power
>
> https://www.maximintegrated.com/en/design/reference-design-center/ref-circuits/7055.html?utm_source=Eloqua&utm_medium=email&utm_content=REFDES1234&utm_campaign=FY20_Q3_2020_FEB_ALL-BU_AMER_EE-Mail_EN
> Bert Kehren
>
> In a message dated 2/8/2020 11:45:09 AM Eastern Standard Time,
> kd4pbj at gmail.com writes:
>
> Hi Taka,
>
> How about using the open frame linear supplies like the ones from Power
> One or Lambda?
> I usually pick these up when I find them, recap if needed and they're a
> cheap and easy way to get a supply.
>
> Chris
> KD4PBJ
>
> > On Feb 6, 2020, at 4:29 PM, Taka Kamiya via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > I have been addicted to home brewing GPSDO, Rubidium, OCXO, and etc,
> etc, etc.  I don't mean making of these from scratch but taking a surplus
> unit and encase them in ready-to-use form.  Most of them are in U2 rack
> case.
> >
> > One part of it that I really do not like is constructing a power supply
> for each and every unit I make.  Good power supplies are essential to clean
> and stable timebase, I know.  It is also heat generating as most of what I
> make use linear regulators.  But it's tedious and mandane to do it every
> single time!  So, I wanted to make a large enough power supply to provide
> +24V, +/- 12V, and 5V.  My plan was to have independent feed line for each
> timebase unit.
> > Is this even a good idea?  I have no experience in this to make a
> reasonable judgement.  This plan would mean these power voltages will be
> fed to each components without any local regulation.  While I do plan to
> put ferrite chokes and bypass capacitors at input, but since the whole
> point is to eliminate local power supply components, there will be nothing
> else in terms of isolation.
> > Similarly, I was also thinking of having a large battery bank for 24
> volt supply.  What type of battery is irrelevant and so as charging method
> for this question.  I have heard of this being done.  But for units that
> require 24 volts, that means there is no room for any type of regulation.
> Most 24V batteries output varying voltage depending on state of charging.
> I know 12V battery can produce as high as 13.x volt.  Is anyone doing this
> type of thing on this list?  If so, would you be willing to share details?
> >
> > Appreciate any input.
> >
> > ---------------------------------------
> > (Mr.) Taka Kamiya
> > KB4EMF / ex JF2DKG
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