[time-nuts] FE5680 GPS Disciplined Controller Update
EWKehren at aol.com
EWKehren at aol.com
Wed Jun 25 00:03:35 UTC 2014
I think there is a misunderstanding.When I am talking about the temperature
problem I am talking about eliminating the DDS steps internal to the FE
5680A which is shown in the data sheet and N5TNL well documented and was in
one of my attachments.
Fan control should also be considered ideally both would be used. Attached
are two controllers that I previously posted, we use the linear version on
FRK and M 100 and observe 0.01 C on the back plate and better than 0.1 C on
the front using a 12 V fan.
The schematic and board layout have been posted code will not be released.
Bert Kehren
In a message dated 6/24/2014 7:43:52 P.M. Eastern Daylight Time,
albertson.chris at gmail.com writes:
On Tue, Jun 24, 2014 at 3:24 PM, Mark Sims <holrum at hotmail.com> wrote:
> ...
> However it is disappointing that no one has stepped up to tackle the
> temperature problem.
I can post what I have. It's a uP based PWM fan controller. It is a
stand
alone device that does not know anything about the FE5680 but it would be
easy to add into any GPSDO using the GPSDO's existing uP provided there
were enough extra analog pins available. It uses the Arduino software
environment but I built it using a bare 8-pin DIP. The problem with it is
I do not have a good temperature sensor, The ones I tried are noisy. SO
I'm looking forward to your sensor info.
My first controller used a comparator chip. Then I figured the uP was the
same cost and same 8-pin package but could do things like PID, data
logging, led status blinking and "whatever". This is a start on the code
that works just like the comparator and uses a pot for the user to adjust a
set point.
If you see a way to make this better post the changes.
Some things I will do are (1) use better sensor, (2) use PID library, (3)
measure ambient air temp.
FanController.ino
<https://dl.dropboxusercontent.com/u/28915695/FanController.ino>
BTW is there any design info on the FE5680 controller. Schematics of
source code?
--
Chris Albertson
Redondo Beach, California
_______________________________________________
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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: TempRegler.pdf
Type: application/pdf
Size: 59722 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20140624/1a316b04/attachment.pdf>
More information about the Time-nuts_lists.febo.com
mailing list