[hpsdr] Debugging Atlas

[Orval Chadsey]

Don't trust the line on the capacitors to indicate the negative end.
I downloaded the manufacturer's info on them and - surprise - the line
is the positive end.

Check the data sheet:
 http://www.vishay.com/docs/40002/293d.pdf 

-- 
73 de N6OZI
Orval

-----Original Message-----
From: Neal Campbell <nealk3nc at gmail.com>
To: Kjell Karlsen <la2ni at online.no>
Cc: hpsdr at lists.hpsdr.org
Subject: Re: [hpsdr] Debugging Atlas
Date: Sat, 31 Jan 2009 17:32:56 -0500

***** High Performance Software Defined Radio Discussion List *****

Hi Kjell

Sadly they are all positioned correctly but thanks for responding. I
just reordered a new kit from Tapr, its probably easier to just build
a new one since its not so easy getting to the parts once the
connectors go in!

73
Neal



On Sat, Jan 31, 2009 at 5:02 PM, Kjell Karlsen <la2ni at online.no> wrote:
> Hi Neal:
>
> Have you checked the polarity of the tantalium capasitors on Atlas? My
> experience is that they are very good polarity protection devices but
> normaly they explode when driven by wrong polarity voltage, but they may
> survive sometimes.
>
> 73, LA2NI Kjell
>
>
> På Sat, 31 Jan 2009 22:10:57 +0100, skrev Neal Campbell
> <nealk3nc at gmail.com>:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi all
>>
>> I have built what is my 5th Atlas board and I just cannot find what is
>> wrong with it. If I do the continuity checks between ground and the
>> +/- voltage outlets, it tests just fine. I have Tapr-built boards
>> which also test as having no shorts between ground and the various
>> feed voltages. Yet if I plug in the Janus card into any Atlas slot and
>> apply power, it immediately shorts and blows the internal fuse of the
>> power supply. I have tried 2 power supplies so I am sure its not in
>> the power supply.
>>
>> Any guidance on where to look for problems? I have reviewed/resoldered
>> everything under my microscope and it all looks proper!
>>
>> Thanks
>>
>> Neal Campbell
>> Abroham Neal Software
>> Programming Services for Windows, OS X and Linux
>> www.abrohamnealsoftware.com
>> (540) 242 0911
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>
>
>
> --
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>
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