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From: TTman on 12 Nov 2009 03:34

>
> The base has molded terminal locations numbered 1-4, two of which are
> empty:
>
> <http://i36.tinypic.com/e6x542.jpg>
>
> Markings on the side are:
>
> B41111-B7108-T
> 1000uF 40V-
> GERMANY
> GPF DIN 41332 06.78
>
> I find a few references to a Siemens part that is similar:
>
> <http://www.screenghost.com/shop/show.asp?ID=74#>
>
> but no datasheet can I find. Can someone more resourceful than I find one?
>
> I cut open one of these caps. It is paper & foil (or so it seems) spiral
> wrap
> construction. Can polarity be determined by internal construction? Is the
> center terminal always one pole (ie, always +)?
>
> Thanks.
>
AFAIK Germans always write a ONE with a tag ( opposite 2) and a 7 with a tag
through it that makes it look like a lower case t.
So I suggest the - really is MINUS.


From: baron on 12 Nov 2009 06:00
TTman Inscribed thus:

>
>>
>> The base has molded terminal locations numbered 1-4, two of which are
>> empty:
>>
>> <http://i36.tinypic.com/e6x542.jpg>
>>
>> Markings on the side are:
>>
>> B41111-B7108-T
>> 1000uF 40V-
>> GERMANY
>> GPF DIN 41332 06.78
>>
>> I find a few references to a Siemens part that is similar:
>>
>> <http://www.screenghost.com/shop/show.asp?ID=74#>
>>
>> but no datasheet can I find. Can someone more resourceful than I find
>> one?
>>
>> I cut open one of these caps. It is paper & foil (or so it seems)
>> spiral wrap
>> construction. Can polarity be determined by internal construction? Is
>> the center terminal always one pole (ie, always +)?
>>
>> Thanks.
>>
> AFAIK Germans always write a ONE with a tag ( opposite 2) and a 7 with
> a tag through it that makes it look like a lower case t.
> So I suggest the - really is MINUS.

I agree ! That is how I read it.

--
Best Regards:
Baron.
From: ChrisQ on 12 Nov 2009 06:58
Sparky wrote:
> This cap was removed from a 70's-80's German industrial machine:
>
> <http://i37.tinypic.com/10psxg3.jpg>
>
> It has no polarity markings. One terminal is common with the metal case. Is
> this always an indication of the (-) terminal?
>
> The base has molded terminal locations numbered 1-4, two of which are empty:
>
> <http://i36.tinypic.com/e6x542.jpg>
>
> Markings on the side are:
>
> B41111-B7108-T
> 1000uF 40V-
> GERMANY
> GPF DIN 41332 06.78
>
> I find a few references to a Siemens part that is similar:
>
> <http://www.screenghost.com/shop/show.asp?ID=74#>
>
> but no datasheet can I find. Can someone more resourceful than I find one?
>
> I cut open one of these caps. It is paper & foil (or so it seems) spiral wrap
> construction. Can polarity be determined by internal construction? Is the
> center terminal always one pole (ie, always +)?
>
> Thanks.
>

If you *really* can't identify polarity from the part, trace the circuit
back to the rectifier, another cap or dc input to the board. Or, solder
a non polarised cap of a few uF to the board, power up and check with a
meter. The fact that it's lower uF than the electrolytic is unlikely to
damage anything...

Regards,

Chris
From: chrisj.doran on 12 Nov 2009 07:43
On 12 Nov, 08:41, Sparky <s...(a)thesig.net> wrote:
> This cap was removed from a 70's-80's German industrial machine:
>
> <http://i37.tinypic.com/10psxg3.jpg>
>
> It has no polarity markings. One terminal is common with the metal case. Is
> this always an indication of the (-) terminal?

Almost always, but ISTR reading warnings that occasionally you come
across one made for use with a negative supply rail, when the can will
be positive, so you're right to make sure.

However, in this instance I agree with other posters that the markings
indicate that the can is negative.

Chris
From: PeterD on 12 Nov 2009 08:51
On Wed, 11 Nov 2009 23:41:36 -0800, Sparky <see(a)thesig.net> wrote:

>This cap was removed from a 70's-80's German industrial machine:
>
><http://i37.tinypic.com/10psxg3.jpg>
>
>It has no polarity markings. One terminal is common with the metal case. Is
>this always an indication of the (-) terminal?
>
>The base has molded terminal locations numbered 1-4, two of which are empty:
>
><http://i36.tinypic.com/e6x542.jpg>

Me, I'd guess the terminal marked with the '-' is negative, but that's
just my warped thinking.

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