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

[Bob kb8tq]

Hi

Grab your DVM and take a look at the voltage on the input caps on one of those
supplies as compared to the output voltage. With light loads (which is how most
use them …) the voltage ratio is pretty high. As a result, the efficiency is not as
good as it could be.

The Acopian versions that come fully enclosed are no more efficient, but are nicely
protected from “stuff". Like the rest, they can be found on eBay for not a lot of money ….

Bob

> On Feb 8, 2020, at 11:44 AM, Chris Waldrup <kd4pbj at gmail.com> wrote:
> 
> 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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