[time-nuts] Thunderbolt Power Supply Question

Arthur Dent golgarfrincham at yahoo.com
Mon Apr 26 20:26:40 EDT 2010

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.  


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