[time-nuts] Low noise power supplies for time nuts circuitry

Kevin Rosenberg kevin at rosenberg.net
Thu Nov 24 13:50:41 EST 2011

On Nov 23, 2011, at 5:50 AM, Chuck Forsberg WA7KGX N2469R wrote:
> How sensitive are each of a Thunderbolt's 3 supplies to noise?

This doesn't break down the sensitivities to noise, but Tom shows
a range of TBolt output noise for different 3 voltage power supplies:

My suspicion is the -12V is the least sensitive as I heard that it
is only used for the RS-232 port. I think either the the +5V which
controls the electronics (including things like comparators) and
the +12V (which controls the heater to the OXCO) are both noise
sensitive. I think the +5V will be the most sensitive.

For the PRS10 Rb, two 24V inputs are provided. A higher current
for the heater and a lower current for the electronics. To my
mind, that makes it likely the electronics (+5V on the TBolt)
are the most sensitive.

Maybe someone will actually have data to show.


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