[time-nuts] Linear voltage regulator hints...
kb8tq at n1k.org
Tue Dec 9 07:30:40 EST 2014
> 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.
> 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
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts