audio recording on IC -help wanted

[Lewin A.R.W. Edwards]

The caps in question are G-LUXON 1000uF, 6.3V, 105 deg C rating, date
code 0117(M). ALL of them are visibly bulged on top. Sticky dust-mud

Seems strange that they all went south, is it not also possible that the board
had an on-board regulator failure??

It doesn't seem very likely. These caps smooth a 3.3V rail which runs
all over the board. There is a group of four of these caps near the
processor, and one near the RAM slots. Near a couple of other
subassemblies, there are smaller (330uF 6.3V) caps on the same rail.
These other caps are visually fine, and I pulled and tested a few at
random and found them close to nominal value. It's just the G-LUXON
1000uF caps that are bad. Most of them measure 5-10uF or open circuit.

 

[RusH]

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote :

FWIW, Luxon (Taiwan based, but undoubtedly with China
manufacturing) has denied involvment in that scandal.

http://group.luxon.com.tw/

And Clinton didnt inhale. Pale of broken caps from Abit boards knows
better.


Pozdrawiam.
--
RusH //
http://randki.o2.pl/profil.php?id_r=352019
Like ninjas, true hackers are shrouded in secrecy and mystery.
You may never know -- UNTIL IT'S TOO LATE.

 

[Spehro Pefhany]

On Sun, 31 Oct 2004 18:50:57 +0000 (UTC), the renowned Peter A Forbes
<diesel@easynet.co.uk> wrote:
f

Seems strange that they all went south,

If one goes high ESR, it increases the power dissipation in the
remaining good caps.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Dave Farrance]

Peter A Forbes <diesel@easynet.co.uk> wrote:

On 31 Oct 2004 09:43:13 -0800, larwe@larwe.com (Lewin A.R.W. Edwards) wrote:
...
I'm wondering if this is a symptom of that problem people were talking
about a while ago, where an incomplete/not-ready-for-primetime
electrolyte formula was stolen and used in Chinese-made caps, which
then exhibited an unusually high mortality rate.

Seems strange that they all went south, is it not also possible that the board
had an on-board regulator failure??

It's because the defective electrolyte produced gas at a consistent
rate.

Of course, it's likely that a regulator failure would fry the board
BECAUSE the capacitors failed.

--
Dave Farrance

 

forall2see_2000@yahoo.com(forall2see_2000@yahoo.com) wrote:

I would like to recommend my web host
[spamsalot.com]
they are an excellent web hosting company with an incredible offer.

Thanks for the warning, one of our clients is looking for a new
hosting company, we'll steer clear of spamsalot.com

 

[OH YEAH]

<William P.N. Smith> wrote in message
news:t65bo0lt4njtkgs4tieg9jdrbgmenl202c@4ax.com...

forall2see_2000@yahoo.com(forall2see_2000@yahoo.com) wrote:
I would like to recommend my web host
[spamsalot.com]
they are an excellent web hosting company with an incredible offer.

Thanks for the warning, one of our clients is looking for a new
hosting company, we'll steer clear of spamsalot.com

Spamsalot.com????? Please tell me that was a joke! If that is the actual
name of a web hosting company, I'd have to think most people looking for
websites for info or to be carried on, would steer far away from that sort
of name - for fear of BEING spammed OR having their reputation ruined by
people thinking that's the nature of their business. Spamming.

TRM.

 

"OH YEAH" <OHYEAH@Youarekidding.com> wrote:

Thanks for the warning, one of our clients is looking for a new
hosting company, we'll steer clear of spamsalot.com

Spamsalot.com????? Please tell me that was a joke!

I didn't want to give the spammer, who has so far visited every
newsgroup I follow, any more free exposure.

 

[me]

Dave Farrance <DaveFarrance@OMiTTHiSyahooANDTHiS.co.uk> wrote in
news5nao0h0v15158qlcj0hrfifs7l06e1rgi@4ax.com:

Peter A Forbes <diesel@easynet.co.uk> wrote:

On 31 Oct 2004 09:43:13 -0800, larwe@larwe.com (Lewin A.R.W. Edwards)
wrote:
...
I'm wondering if this is a symptom of that problem people were
talking about a while ago, where an
incomplete/not-ready-for-primetime electrolyte formula was stolen and
used in Chinese-made caps, which then exhibited an unusually high
mortality rate.

Seems strange that they all went south, is it not also possible that
the board had an on-board regulator failure??

It's because the defective electrolyte produced gas at a consistent
rate.

Of course, it's likely that a regulator failure would fry the board
BECAUSE the capacitors failed.

They are usually used as the filters on a switching power supply.


----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
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[Uwe Bonnes]

In comp.arch.embedded Lewin A.R.W. Edwards <larwe@larwe.com> wrote:
: > >The caps in question are G-LUXON 1000uF, 6.3V, 105 deg C rating, date
: > >code 0117(M). ALL of them are visibly bulged on top. Sticky dust-mud
: >
: > Seems strange that they all went south, is it not also possible that the board
: > had an on-board regulator failure??

: It doesn't seem very likely. These caps smooth a 3.3V rail which runs
: all over the board. There is a group of four of these caps near the
: processor, and one near the RAM slots. Near a couple of other
: subassemblies, there are smaller (330uF 6.3V) caps on the same rail.
: These other caps are visually fine, and I pulled and tested a few at
: random and found them close to nominal value. It's just the G-LUXON
: 1000uF caps that are bad. Most of them measure 5-10uF or open circuit.

Are you sure you didn't touch the ripple current specs of the caps? I guess,
near the processor and the switching regulator the caps will carry a
substantial ripple current.

--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

 

[MM]

Thanks a lot!

/MM


"Dieter Wiedmann" <Dieter.Wiedmann@t-online.de> wrote in message
news:41834A88.E97A9FE7@t-online.de...

MM schrieb:

I have designed a board, which uses several CD74HC4316 switches. By
mistake
I designed it for the CD74HC4316N in a wide SOP package. This part seems
to
be obsoleted in favour of the CD74HC4316M in narrow SOIC.

Look for MM74HC4316SJ from Fairchild Semiconductor.


Regards,
Dieter

 

[Watson A.Name - \"Watt Su]

"Norm Dresner" <ndrez@att.net> wrote in message
news:WXohd.818252$Gx4.791325@bgtnsc04-news.ops.worldnet.att.net...

"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:10ob9o0tfm8drbc@corp.supernews.com...
I acquired many bags of these resistor SIPPS, each bag has at least
ten
of them. Each SIPP is made up of 13 (or 11 or even less) 1k, 5%
1/4W
resistors, all have one lead connected at the top to a bus. Each
resistor has the remaining lead sticking down, about a half inch
(13mm)
long, also including the bus lead.

I usually see these res packs in values that are lower, like 330,
for
TTL, and higher, like 10k, for CMOS. What's a common use for 1k? I
was
thinking that they might be ok for current limiting resistors for
LEDs,
if 2 or more were paralleled. Two in parallel would give six 500
ohm
resistors, and 3 in parallel would give four 333 ohm resistors. I'm
trying to think up a use for these. Maybe sell them on ebay? I
dunno.

My guess is that they may have been used years ago in a digital
trainer
for pullups for DIP switches. But nobody uses DIP switches any
more,
everything is saved in EEPROM.

Thanks.

For many years in the '70s when I designed with TTL (mostly standard
with
some of the newer LS) the 1K pullup was more or less standard ---
along with
the 3K which became more popular as LS became more prevalent. The DIP
resistor networks I still have in the parts cabinet are 100, 1K, 3K,
10K,
100K, and 1M and I didn't bother to stock any other values. The 100's
were
used to create 50 ohm terminations with one as pull-up and the other
pull-down.

Norm

Thanks for the confirmation. I've seen the DIP resistors often in older
equipment, too. These are just 1/4W resistors connected to a bus and
ready to be inserted into a PC board. Did you use the DIPs for pullups
for open collector TTL, or DIP switches, or what? Thanks.

 

[Jim Adney]

On Tue, 02 Nov 2004 17:43:17 GMT "Dave Anderson"
<dave-at-bd4.org@NoSpamSeeFirstPartOfAddress.com> wrote:

The markings on board #1 diodes are: (as you roll the diode around)

M (motorola logo)
48
S33
324

The markings on board #2 diodes are:

M (motorola logo)
48
S33
936

My guess is that the digits which are different are just date codes. I
don't recognize the remaining numbers. I wonder if there's something
called a 48S33?

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------

 

[Rich Webb]

On 3 Nov 2004 16:45:34 -0800, st_yar@yahoo.com (yar) wrote:

hi
I have a problem with this ic (stk6713amk3)(16pin) & I want to
replace it with transistors but I don't find the data sheet but I
search until I find its function ( 4-phase stepping motor tr .3/3.5
amp) what I can do now ?

http://www.datasheetarchive.com/ has the data sheet.

--
Rich Webb Norfolk, VA

 

[Lewin A.R.W. Edwards]

The caps in question are G-LUXON 1000uF, 6.3V, 105 deg C rating, date
code 0117(M). ALL of them are visibly bulged on top. Sticky dust-mud

You can probably expect most of the products built with the defective
capacitors to fail, after a few hundred to a few thousand hours of

The runtime clocks on the failed units are, interestingly enough,
clustered around an average of approx. 3,400 hours. Without looking
through them all, I see the lowest at hand is 2171 and the highest is
3709.

Well, this is good and bad news, assuming that is in fact the only
problem. It's good news in that the customer obstinately selected these
particular boards instead of a more expensive board I had originally
recommended . It's bad news in that I think I'll be asked to repair
them all rather than testing and requalifying some new motherboard.

One of those "quick" contracts that rears up a couple of years later to
bite one's hindquarters. Oh well. Thanks for the reply. I hope the one I
repaired is still running on Wednesday, because if so I think the
problem's fixed (it usually shows up within an hour of powerup after
cold, I figure a few days trouble-free is fairly safe).

 

[Peter A Forbes]

On 31 Oct 2004 09:43:13 -0800, larwe@larwe.com (Lewin A.R.W. Edwards) wrote:

I'm trying to analyze a group of almost simultaneous failures in
products that were released in 2002. The product is built on an x86
motherboard, in a housing that meets or exceeds normal PC-case
airflow. It SEEMS - and I'm still burning in a "repaired" board to
test this theory - that the culprit parts are specific electrolytic
caps used in various places over the PCB.

The caps in question are G-LUXON 1000uF, 6.3V, 105 deg C rating, date
code 0117(M). ALL of them are visibly bulged on top. Sticky dust-mud
has gathered in the intersection of the score-marks on top, which
leads me to believe that they bulged enough to break the can here and
electrolyte has vented out. All the other electros on the board look
normal. But then none of the other caps on the board are G-LUXON
brand; they are mostly Sanyo.

I'm wondering if this is a symptom of that problem people were talking
about a while ago, where an incomplete/not-ready-for-primetime
electrolyte formula was stolen and used in Chinese-made caps, which
then exhibited an unusually high mortality rate.

Seems strange that they all went south, is it not also possible that the board
had an on-board regulator failure??

Just a thought.

Peter

 

[Klaus Vestergaard Kragelu]

"Uwe Bonnes" <bon@elektron.ikp.physik.tu-darmstadt.de> wrote in message
news:cm5899$b3j$1@lnx107.hrz.tu-darmstadt.de...

In comp.arch.embedded Lewin A.R.W. Edwards <larwe@larwe.com> wrote:
: > >The caps in question are G-LUXON 1000uF, 6.3V, 105 deg C rating, date
: > >code 0117(M). ALL of them are visibly bulged on top. Sticky dust-mud
:
: > Seems strange that they all went south, is it not also possible that
the board
: > had an on-board regulator failure??

: It doesn't seem very likely. These caps smooth a 3.3V rail which runs
: all over the board. There is a group of four of these caps near the
: processor, and one near the RAM slots. Near a couple of other
: subassemblies, there are smaller (330uF 6.3V) caps on the same rail.
: These other caps are visually fine, and I pulled and tested a few at
: random and found them close to nominal value. It's just the G-LUXON
: 1000uF caps that are bad. Most of them measure 5-10uF or open circuit.

Are you sure you didn't touch the ripple current specs of the caps? I
guess,
near the processor and the switching regulator the caps will carry a
substantial ripple current.

My thoughts also. If this is indeed a 3.3V line for a power-hungry processor
the caps needs to be very low ESR types or many of them in parallel

Cheers

Klaus

 

[Spehro Pefhany]

On Mon, 1 Nov 2004 19:03:44 +0100, the renowned "Klaus Vestergaard
Kragelund" <klauskvik@hotmail.com> wrote:

My thoughts also. If this is indeed a 3.3V line for a power-hungry processor
the caps needs to be very low ESR types or many of them in parallel

Usually *both*.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Watson A.Name - \"Watt Su]

"Terry Given" <my_name@ieee.org> wrote in message
news:vhiid.3093$op3.127494@news.xtra.co.nz...

Norm Dresner wrote:

[snip]

Thanks for the confirmation. I've seen the DIP resistors often in
older
equipment, too. These are just 1/4W resistors connected to a bus
and
ready to be inserted into a PC board. Did you use the DIPs for
pullups
for open collector TTL, or DIP switches, or what? Thanks.


Pull-ups in general. Not only OC outputs, but also inputs that had
to be
tied high. Switches. Sometimes termination for between-board lines
too.

Norm


Not only that, but wherever you might need a whole bunch of 1k
resistors
with a common terminal... 1k was a common pull-up in ttl designs.

we used to have a quad smt machine that had an incorrect SIP array -
it
was supposed to be 1k, driving some LEDs from a 12V supply, but they
fitted 220R instead. When we pulled the cover off the machine (it
reported a failure) these LEDs lit up the ceiling. The resistor pack
was
glowing faintly, and the pcb was a nice dark brown colour. Not bad for
a
$500,000 machine that was 1 month old

What?? No smoke? No smell? They didn't get their money's worth! ;-)

I do a lot of work using 1206 quad-packs - 4 individual resistors in a
1206-sized 8-pin package. And dual bc847/857 in a 6-lead sot363
(basically a 6-lead sot23). Lots of scope for creativity. With smt
assembly, placement cost is higher than component cost for discretes,
so
arrays are cost-effective, even if you use wacko series-parallel
arrangements to get stupid values/ratios/etc. And the production
engineer will have your babies if you only use 20 different parts for
a
design. Of course the schematics look crazy, especially when using
transistors as diodes, zeners etc.

Heh-heh. You're making life miserable or these poor souls here in
sci.electronics.repair who can't figure out why this three-legged part
on the board is labeled ZD123.. )

Cheers
Terry

 

[Terry Given]

Watson A.Name - "Watt Sun, the Dark Remover" wrote:

"Terry Given" <my_name@ieee.org> wrote in message
news:vhiid.3093$op3.127494@news.xtra.co.nz...

<snip>

Not only that, but wherever you might need a whole bunch of 1k

resistors

with a common terminal... 1k was a common pull-up in ttl designs.

we used to have a quad smt machine that had an incorrect SIP array -

it

was supposed to be 1k, driving some LEDs from a 12V supply, but they
fitted 220R instead. When we pulled the cover off the machine (it
reported a failure) these LEDs lit up the ceiling. The resistor pack
was
glowing faintly, and the pcb was a nice dark brown colour. Not bad for
a
$500,000 machine that was 1 month old


What?? No smoke? No smell? They didn't get their money's worth! ;-)

LOL. We first figured out the problem when we opened the cover, and the
suspended ceiling glowed bright red. The LEDs were blinding, and I'm not
kidding when I say the SIP was a dull cherry red too.

I do a lot of work using 1206 quad-packs - 4 individual resistors in a
1206-sized 8-pin package. And dual bc847/857 in a 6-lead sot363
(basically a 6-lead sot23). Lots of scope for creativity. With smt
assembly, placement cost is higher than component cost for discretes,

so

arrays are cost-effective, even if you use wacko series-parallel
arrangements to get stupid values/ratios/etc. And the production
engineer will have your babies if you only use 20 different parts for
a
design. Of course the schematics look crazy, especially when using
transistors as diodes, zeners etc.


Heh-heh. You're making life miserable or these poor souls here in
sci.electronics.repair who can't figure out why this three-legged part
on the board is labeled ZD123.. )

ayup. It does mean I have to be very careful when checking my schematics
prior to fabricating pcbs though. I have taken to drawing little
diode,zener,etc. symbols beside the transistors, partly to improve my
self-checks, partly for the poor techs who have to fix these things.

One of my pet peeves is stupid names for power supply voltages on
schematics like Vcc, Vdd and Vee. I tend to use names like +36_72V,
+2V495 etc.

Cheers
Terry

 

[madhattr62]

What quantity of UPC1156h do you have and what price would you consider?