[time-nuts] Anybody want a Thunderbolt power supply?
attila at kinali.ch
Fri Oct 21 04:59:59 EDT 2016
On Fri, 21 Oct 2016 00:20:43 -0400
Scott Stobbe <scott.j.stobbe at gmail.com> wrote:
> The bad side of a 7912 is in long-term stability and tempCo, the sample I
> tested had at least a 150 ppm/degC tempCo, which is going to put a serious
> lump/bump in the 10s tau to gps crossover point on an allan deviation plot.
If the Thunderbolt ist most sensitive to the -12V input, why not use
something like the LT3090? Its temperature coefficient is quite low
in the order of a few ppm/°C around room temperature. Using a metal
film resistor that should keep the output variations low as well.
As added bonus, you get a very low output noise.
And while you are at it, use three LT3090 for the positive supplies :-)
Any simple idea will be worded in the most complicated way.
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