[time-nuts] Thunderbolt Power Supply Question

Bob Camp lists at rtty.us
Tue Apr 27 07:24:35 EDT 2010


The point is that you can indeed get into trouble before the internal regulator drops out. How much trouble depends on the design of the heater.


On Apr 26, 2010, at 8:26 PM, Arthur Dent wrote:

> Bob Camp-"In addition to the influence of the voltage on the oscillator, the voltage 
> change also impacts the temperature control circuit. Most OCXO's control current 
> through the heater rather than power in the heater. As you drop voltage, the power 
> being controlled drops. The net effect is a change in control loop gain. A 10% change 
> probably isn't going to massively degrade stability. A 2:1 change probably would be 
> an issue."
> I'm not sure of the point here. No one is suggesting running the Thunderbolt's +12VDC 
> supply outside of the specified limits. My point in dropping the +12 was as a diagnostic 
> procedure to show that there was an internal regulator to feed the oscillator circuit and 
> that an external regulator that some posters had suggested (or asked about) probably 
> wasn't necessary.  
>                                                          -Arthur
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