Common mode choke filter does not get ride of LINE NOISE on the +12 V or
LINE VOLTAGE sensitivities...,
Please explain how a common mode choke on the +12 and ground does nothing
to help keep the supply clean.
What size is your common mode choke filter?
To have any effect on 60 Hz PS ripple it would need to bigger than a (small)
bread box .
And to help reduce DC type line voltage variations it would need to be
bigger than a planet. (yea, Earth size)
Common mode filters are for HI freq, not 60 Hz OR DC.
But then, you already know that so I do not know why your comment???
ws
*************
Hi
Please explain how a common mode choke on the +12 and ground does nothing to
help keep the supply clean.
Bob
*****************
On Feb 26, 2010, at 9:57 PM, WarrenS wrote:
Lots of questions ....
Same Simple answer.
Make the +12 volts is as good as you can get it, For the rest any general
purpose PS works fine.
And a Common mode choke filter does not get ride of line noise on the +12
V or Line voltage sensitivities, both are important on the +12V
ws
****************
Hi
Depending on the supply setup, a common mode choke might also be a good
idea.
The +12 runs the OCXO, so it's going to have an impact.
What about the +5 Volts? Obviously it needs to be crud free. Gross changes
will impact the temperature of the unit. What about small changes? Is it
running the maser reference for the DAC or does that come off the +12? Is
+5 just a digital supply?
Lots of questions ....
Bob
On Feb 26, 2010, at 6:59 PM, WarrenS wrote:
Yes, I Did that, The +5 and -12 has NO effect on freq or operation of
the unit except for really far out voltages.
I tested mine with the -12 from -2 to -15 and could see no effect in the
e-11 range.
The -12 is used for the RS232 and the -Dac out so If you don't need the
neg Dac out voltage or neg RS232 Drive, then it can pretty much be
anything. But It should be kept in -7 to -13 range, and common sense
means there should be little noise on it so it does not couple into other
things. BUT the circuit it's self does not care what the supply is at or
what is used.
The +12 on the other hand, Needs to be stable and quiet with no ripple.
I found using a +15 volt supply feeding a 12V three terminal will heat
slinked regulator a good way to go to keep ALL the ripple out of the +12V
ws
*******************
Hi
Has anybody actually measured the supply sensitivity on the -12 volt line
to see weather a 5 volt change makes any noticeable difference in the
output frequency? The power on -12 is very low, so there should be
negligible thermal impact from a change.
Bob
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