[time-nuts] HP 106B quartz frequency standard...the story so far

Magnus Danielson magnus at rubidium.dyndns.org
Sat Aug 8 10:56:19 UTC 2009


GandalfG8 at aol.com wrote:
>  
> In a message dated 08/08/2009 09:53:35 GMT Daylight Time,  
> jim77742 at gmail.com writes:
> 
> Unless  anyone has a 2N1701 lying around?
> 
> 
> ----------------
> Hi Jim
>  
> Going back through the archives I see you're about three volts high on  
> that power rail, certainly more than I 'd expect through normal  tolerances.
> Three volts though is also a bit lower than I'd normally expect  as the 
> headroom on a series pass transistor, assuming it is a series regulator?,  so 
> would still suggest checking the transistor itself or measuring  the voltage 
> across it.
> Loading down the output a bit more would also show whether or not the  
> output is actually regulated.

Please also note that it is not necesserilly that transistor which could 
be bad, but the driving curcuit may have gone bad.

Cheers,
Magnus




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