Richard B. Gilbert wrote: > Andy Helten wrote: > >> Richard B. Gilbert wrote: >> >>> David Woolley wrote: >>> >>> >>>>> It looks like the crystal oscillator inside the system has been >>>>> suddenly and permanently altered. Is that even possible? >>>>> >>>>> >>>> I believe that is quite possible as a result of aging. >>>> >>>> >>> I believe that changes in crystal frequency due to aging are gradual >>> and occur over periods measured in years. >>> >>> I would look, instead, at the other components of the oscillator! >>> >> Like the power supply and associated power components. >> > > More like the components in the feedback loop! > > An oscillator is basically an amplifier with the output connected to the > input; the squeal of a PA system with the volume set too high is the > example familiar to almost everyone. > >
Maybe I'm mistaken or maybe it was just a very cheap osciallator, but I'm fairly certain I've seen oscillator specs with voltage sensitivities shown in ppm/V. On such an oscillator, if a power supply changes the 5V or 3V output, it would change the frequency. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
