[time-nuts] Linear voltage regulator hints...

Bob Camp kb8tq at n1k.org
Tue Dec 9 07:30:40 EST 2014


Hi

> On Dec 8, 2014, at 10:35 PM, Brooke Clarke <brooke at pacific.net> wrote:
> 
> Hi Rich:
> 
> Did you use the 723 or . . . .?
> As far as I know the 723 is supposed to have low noise.

There are more modern parts with lower close in noise. Linear Technology has a number of them. Your filter caps take out the broadband stuff, close in is all that really matters.

Bob

> 
> Mail_Attachment --
> Have Fun,
> 
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
> http://www.prc68.com/I/DietNutrition.html
> Richard (Rick) Karlquist wrote:
>> 
>> 
>> On 12/8/2014 4:53 PM, Bert Kehren via time-nuts wrote:
>>> We solved that problem by attaching the regulators to the FRK back plate
>>> which is with fan control is kept within 0.01C. We did not do it for that
>>> purpose but found that we needed some more heat in order to keep the fan in an
>>>  optimum fan speed. Rb, OCXO and Fan power transistor are on the back
>>> plate.  Works for us.
>>> Bert Kehren
>>> 
>> 
>> When I designed the E1938A, I chose a reasonable looking voltage
>> reference IC and put it inside the oven.  I figured that was
>> the end of it as far as tempco was concerned.  It was, but it
>> turned out that the *noise* of the reference was unacceptable
>> and of course the oven does nothing to fix that.  I had to
>> switch to a lower noise reference.
>> 
>> Rick Karlquist N6RK
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> 
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