[time-nuts] newbie question Thunderbolt supply

[Bob Camp]

Hi

The -12 runs the RS-232 and the negative supply to the DAC buffer. As long as it's past about -7V everything works pretty well. With no negative supply the DAC may have issues. Most of the OCXO"s run right around 0V….

Bob

On Aug 25, 2012, at 8:55 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> 
> lists at rtty.us said:
>> The -12 supply is very low current and does not matter much.
> 
> Is the -12 used only for the RS-232, or is it also the negative supply to the 
> DAC?  If the latter, the regulation and noise may be important.
> 
> I think I remember comments about it being used by the DAC.  Wasn't there 
> some mention of the TBolt working with a dead -12 supply, but only as long as 
> the DAC output was above 0.
> 
> 
> 
> -- 
> These are my opinions.  I hate spam.
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> 
> 
> 
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