[time-nuts] [Fwd: Re: Thunderbolt PS]

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Jun 13 20:35:43 EDT 2008

Bill Smitherman wrote:
> To Bruce and Group Concerning Power Supply  Flicker Noise on the
> Thunderbolt  GPS system.
> wouldn't it be prefered to use the old linear supply rather than the compact
> switcher to minimize this RF and Flicker noise ???
> Bill KD4AF
Yes, except that a dc-dc converter can be useful in the event of mains 
With an appropriate design and careful filtering supplemented with 
linear post regulation the noise can be very low.
Flicker noise is likely to be more dependent on the power supply voltage 
reference quality than the type of regulator used.


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