[time-nuts] newbie question Thunderbolt supply

Arthur Dent golgarfrincham at yahoo.com
Sun Aug 26 02:25:25 UTC 2012

>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.

That was the conclusion. Actually the units these Thunderbolts were removed 
from used -7VDC instead of -12VDC. Many Thunderbolts will operate with 
the -12VDC line grounded but it shouldn't be left floating. It wouldn't be a 
good idea to run the Thunderbolt without some negative voltage on this line 
and where it's easy to find a triple output supply, why take the chance. The 
+12VDC is mainly for the oven  and internal to the OXCO it goes to a 
+5VDC linear regulator for the oscillator circuit so the +12VDC isn't as 
critical as the +5VDC.


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