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[time-freq] TADD-1 Question

Matt Osborn kc0ukk at msosborn.com
Sat Apr 14 20:55:01 UTC 2007


No need to ship the part, John, I have a replacement part here. My
main concern was to take advantage of the experience of others.

I discovered the enclosure you've made available today while exploring
the TAP web site.  I see what appear to be two DB9 holes punched in
the back panel.  Are there some expansion options available that I
haven't found yet?

I don't think I'll need the bandpass filter as my source is an Isotemp
OCXO 10MHz oscillator disciplined with Brooks Shera's board.  While I
can build these things, my knowledge level is insufficient to design
them.  So what do you think of the bandpass filter?

On Sat, 14 Apr 2007 16:27:31 -0400, John Ackermann N8UR <jra at febo.com>
wrote:

>Hi Matt --
>
>Sorry about the missing part!  If you'd like, I can send you the 0.33uF
>tantalum.
>
>The data sheet for the 78XX series regulators shows the 0.33 cap on the
>input, but doesn't specify what type it must be, so I think you're OK
>using a ceramic or other non-polarized cap.  We ended up using a
>tantalum cap for the production units because it's what we had in stock. :-)
>
>73,
>John
>----
>
>Matt Osborn said the following on 04/14/2007 04:08 PM:
>> I received my TADD-1 kit this morning and found that capacitor C40
>> (.33ufd) was missing.  The silkscreen has this as non-polarized, but
>> the documentation says that it is polarized.
>> 
>> From the circuit, it doesn't appear to matter what type of capacitor
>> is used but before I plug something in from my junk box, I thought I'd
>> better ask why C40 was changed from non-polarized and just what kind
>> of polarized capacitor would be best.
>> 
>> Thanks for the help.
>> 
>> -- kc0ukk at msosborn dot com
>> 
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>
>
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-- kc0ukk at msosborn dot com




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