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

Brooke Clarke brooke at pacific.net
Mon Dec 8 22:35:48 EST 2014

Hi Rich:

Did you use the 723 or . . . .?
As far as I know the 723 is supposed to have low noise.

Mail_Attachment --
Have Fun,

Brooke Clarke
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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