[time-nuts] Anybody want a Thunderbolt power supply?

Bob Camp kb8tq at n1k.org
Thu Sep 1 11:10:47 EDT 2016


Hi

The gotcha is that an OCXO acts as a negative resistance load (current goes up as voltage goes down). 
That makes wiring up multiple units problematic. It is not impossible to do, but you can get in trouble. Putting
regulation at each device eliminates the problem. It may be overkill, but the interaction can be tough to spot so 
it is generally a good idea.

Bob

> On Sep 1, 2016, at 10:44 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> 
> James wrote:
> 
>> Is there a problem running more than one Thunderbolt off of the same linear supply (assuming the supply can support the current demands) or does each Thunderbolt require its’ own separate linear supply?
> 
> I do not anticipate that multiple Tbolts would interact in a negative manner if they were connected to a good linear supply capable of driving them all.  Of course, there is always a possibility that I'm wrong and they would interact.  Only trying it will answer that question.
> 
> Note that, as Bob pointed out, the +12v supply will need to source 700-800mA *per Tbolt* for a few minutes if they are all powered up at once from cold.  Even if you wouldn't do this in a manual startup, it would happen when the power came back on if you had a power failure (unless you devised some automatic means to prevent it).
> 
> Best regards,
> 
> Charles
> 
> 
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