[time-nuts] FE-5680A decoded - another piece of the puzzle

paul swed paulswedb at gmail.com
Tue Jan 31 09:15:57 EST 2012


I did the mod and getting to pin 5 was tough. However Doug mentioned that
there is another point to the left of the chip thats easier to get to.
Don't recall the point. But if the lead ever comes off of 5 I can assure
you I will find it. :-)
My unit zeroed about at about 2 V. So I am using a 10 T 10 K bourns pot
with 1000 counter. Then a 3.3V reg directly attached with bypass caps
driven by 8 V from the regulated supply in the RB.
Very clean, 3 leads into the RB. Using shielded cable through the pot hole
that actually does nothing.
Regards
Paul.

On Tue, Jan 31, 2012 at 2:19 AM, John Beale <beale at bealecorner.com> wrote:

> On 1/29/2012 8:22 PM, Skip Withrow wrote:
>
>> I recall someone implementing C-field control on a FE-5680A with the pot
>> disabled, but cannot find it now.  If someone can point me to that post I
>> sure would appreciate it.
>>
>
> I added that post to the FE-5680A FAQ, and added my own photo also to help
> locate the part. Note, I have not actually tried this modification myself.
>
> http://www.ko4bb.com/dokuwiki/**doku.php?id=precision_timing:**
> fe5680a_faq#adding_an_analog_**adjustment_pot<http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq#adding_an_analog_adjustment_pot>
>
> Original post was by Bill Riches, Thu, 22 Dec 2011 14:01:18 -0800
>
>
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