sci.electronics.repair - 24 new messages in 10 topics - digest

sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en

sci.electronics.repair@googlegroups.com

Today's topics:

==============================================================================
TOPIC: "Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "
Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika
Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-
pics.blogspot.com
http://groups.google.com/group/sci.electronics.repair/t/e78add903652bcfc?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, May 28 2010 1:57 am
From: Naeem

"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com "Hansika Motwani IN
DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY" "Hansika Motwani as
college GIRL" "Hansika Motwani in GYM in RED BRA" "Hansika Motwani in
GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on http://hollywood-bollywood-pics.blogspot.com
"Hansika Motwani IN DENIM JEANS" "Hansika Motwani BEAUTIFUL BELLY"
"Hansika Motwani as college GIRL" "Hansika Motwani in GYM in RED BRA"
"Hansika Motwani in GREEN SAREE BELLY" "BOLLYWOOD GIRLS" on
http://hollywood-bollywood-pics.blogspot.com vv

==============================================================================
TOPIC: Update on NOISY Whirlpool Dehumidifier
http://groups.google.com/group/sci.electronics.repair/t/3215179bfc2516b2?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, May 28 2010 5:20 am
From: jaugustine@verizon.net

Hi,

I think I have finally "tamed the beast". My latest technique (two boards
with long threaded rods, see below) is working! I have been using the
dehumidifier for the past two weeks since, and it is hard to believe the
dehumidifier noise level remains normal !

John

On Wed, 12 May 2010 13:10:38 -0400, you wrote:

>Hi,
>
> I did not list the different methods I tried, starting with different
>weights on top, insuring that everything is "tight" inside, checking
>the rubber mounts used by the compressor, different small carpets
>for it to sit on, and many other techniques.
>
> My latest attempt, I used two boards with holes near each end and
>long threaded rods (with nuts, flat & lock washers) through the holes in order
>to squeeze the sides (boards against sides) of the cabinet. So far (one day),
>it seems to work, but other methods I tried in the past seemed to work, but
>only for a while.
>
> Since this cold spell hit us, the dehumidifier is turned off. I will have
>to wait until warmer weather comes back before I use it again. If this
>latest technique works for at least two weeks, I will post an "update".
>
> John

Original post, you wrote:

>>Hi,
>>
>> I bought a Whirlpool model AD50DSS2 dehumidifier. It is a very NOISY
>>(vibration noise) dehumidifier!
>>
>> A service man came. He thought he fixed it, but later the NOISE was
>>back.
>>
>> The dehumidifier's cabinet "amplifies" the compressor's vibration. A
>>call to Whirlpool was no help at all.
>>
>> I am a ham radio operator and found out from other hams that I am not the
>>only one that has a NOISY Whirlpool dehumidifier.
>>
>> I would like to hear from others with the same problem.
>>
>> Thank You in Advance, John N3AOF
>>
>> PS, Remove "ine" from my email address

==============================================================================
TOPIC: lead cropping spinner plate?
http://groups.google.com/group/sci.electronics.repair/t/88c833ccb0205fe2?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, May 28 2010 5:28 am
From: Smitty Two

In article <htnr4s$q05$1@news.eternal-september.org>,
"N_Cook" <diverse@tcp.co.uk> wrote:

> N_Cook <diverse@tcp.co.uk> wrote in message
> news:htm0oi$pfc$1@news.eternal-september.org...
> > Whats it/process called and is there a name for the relatively common
> > situation where the blade is blunt or wrong speed or something. Leads bend
> > over before they are cut, so partially cut and floppy, and dozens are left
> > in place to short to adjascent pin or drop onto other areas. Not picked up
> > at visual inspection or ignored.
> >
> >
>
> I think Ferguson when at Gosport was the last time I actually saw one , but
> I don't remember the cutting action. Is it a knife action plain or serrated
> or diamond/grit edged grinding action ?

Rotary blade, hardened tool steel. Dead flat on one face, ground to a
sharp edge from the other face. Flat surface obviously faces the PCB.

==============================================================================
TOPIC: Difficulty identifying SMD semis via markings
http://groups.google.com/group/sci.electronics.repair/t/c70253594bd15876?hl=en
==============================================================================

== 1 of 7 ==
Date: Fri, May 28 2010 6:13 am
From: Meat Plow

On Thu, 27 May 2010 20:35:25 -0700, DaveC wrote:

>> http://www.marsport.org.uk/smd/
>
> No "HFJ" listings.
>
> Thanks,
> Dave

Sorry, was the only URL I had.

== 2 of 7 ==
Date: Fri, May 28 2010 11:46 am
From: "Uffe Bærentsen"

"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
> I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
> less-than-brief alphanumeric codes have no standard that I can find.
>
> And if there's no manufacturer mark (or it has become illegible), there's
> no
> hope of finding a replacement.
>
> In my case:
> HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.
>
> I'm speaking, of course, of a circuit that has no schematic available for
> it.
>
>
> Is there a device code data base? Maybe I just missed it in my Yahooing?

There is a database here:
http://www.clivetec.0catch.com/SMD_Codes.htm

and here you can find HF:
http://www.clivetec.0catch.com/SMD_CodesH.htm

--
Uffe Bærentsen

== 3 of 7 ==
Date: Fri, May 28 2010 12:01 pm
From: Rich Webb

On Fri, 28 May 2010 20:46:00 +0200, "Uffe Bærentsen"
<leiti_NOSPAM_@hotmail.com> wrote:

>
>"DaveC" <invalid@invalid.net> skrev i en meddelelse
>news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
>> I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
>> less-than-brief alphanumeric codes have no standard that I can find.
>>
>> And if there's no manufacturer mark (or it has become illegible), there's
>> no
>> hope of finding a replacement.
>>
>> In my case:
>> HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.
>>
>> I'm speaking, of course, of a circuit that has no schematic available for
>> it.
>>
>>
>> Is there a device code data base? Maybe I just missed it in my Yahooing?
>
>There is a database here:
>http://www.clivetec.0catch.com/SMD_Codes.htm
>
>
>and here you can find HF:
>http://www.clivetec.0catch.com/SMD_CodesH.htm

Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).

--
Rich Webb Norfolk, VA

== 4 of 7 ==
Date: Fri, May 28 2010 12:06 pm
From: Meat Plow

On Fri, 28 May 2010 15:01:51 -0400, Rich Webb wrote:

> On Fri, 28 May 2010 20:46:00 +0200, "Uffe Bærentsen"
> <leiti_NOSPAM_@hotmail.com> wrote:
>
>
>>"DaveC" <invalid@invalid.net> skrev i en meddelelse
>>news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
>>> I've never had to look up a SMD semi before now. Unlike JEDEC codes,
>>> these less-than-brief alphanumeric codes have no standard that I can
>>> find.
>>>
>>> And if there's no manufacturer mark (or it has become illegible),
>>> there's no
>>> hope of finding a replacement.
>>>
>>> In my case:
>>> HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.
>>>
>>> I'm speaking, of course, of a circuit that has no schematic available
>>> for it.
>>>
>>>
>>> Is there a device code data base? Maybe I just missed it in my
>>> Yahooing?
>>
>>There is a database here:
>>http://www.clivetec.0catch.com/SMD_Codes.htm
>>
>>
>>and here you can find HF:
>>http://www.clivetec.0catch.com/SMD_CodesH.htm
>
> Warning ... Do not visit the above site with javascript enabled and/or
> an industrial strength pop-up blocker if you value your sanity (and
> possibly your PC).

Chromium for Linux seemed to handle the pop-up crap well. Clivetech needs
to find a better free host.

== 5 of 7 ==
Date: Fri, May 28 2010 12:34 pm
From: DaveC

> Warning ... Do not visit the above site with javascript enabled and/or
> an industrial strength pop-up blocker if you value your sanity (and
> possibly your PC).

Yeah, I saw that. Pretty intense pop-ups. Still, the data is worth the trip.

Dave

== 6 of 7 ==
Date: Fri, May 28 2010 12:34 pm
From: DaveC

> There is a database here:
> http://www.clivetec.0catch.com/SMD_Codes.htm
>
>
> and here you can find HF:
> http://www.clivetec.0catch.com/SMD_CodesH.htm

Thanks, Uffe!

Dave

== 7 of 7 ==
Date: Fri, May 28 2010 12:35 pm
From: DaveC

> FWIW, a "HF" marking code identifies a Toshiba 2SC3124 NPN transistor,
> 15V, 50mA, for TV Tuner, VHF Oscillator Applications:
>
> http://www.datasheetcatalog.org/datasheet/toshiba/1264.pdf

Thanks.

> The lowercase "j" may be unrelated to the part number.

Not lowercase. Uppercase, just smaller type than "HF"

> For example, a Philips BCW89 transistor has a marking code of H3*,
> where *=p for "Made in Hong Kong", or *=t for "Made in Malaysia".
>
> http://www.nxp.com/documents/data_sheet/BCW89.pdf
>
> You may be able to discern the manufacturer, or country of origin,
> from the surrounding components. The function of the device may be
> deduced from the circuit itself. For example, is the board part of a
> tuner?

Acquisition PCB, Tek TDS420 scope. No schematics in the public domain.

Thanks again,
Dave

==============================================================================
TOPIC: Pencil butane torch for Surface Mount desolder?
http://groups.google.com/group/sci.electronics.repair/t/acea69c502303796?hl=en
==============================================================================

== 1 of 3 ==
Date: Fri, May 28 2010 7:49 am
From: Winston

On 5/28/2010 1:03 AM, N_Cook wrote:
> N_Cook<diverse@tcp.co.uk> wrote in message
> news:htnsgv$vpv$1@news.eternal-september.org...
>> Winston<Winston@bigbrother.net> wrote in message
>> news:htmhm6022th@news2.newsguy.com...
>>> On 5/27/2010 7:42 AM, N_Cook wrote:

(...)

>>>> I like the solder paste indicator.
>>>
>>> It works 'better than nothing'.
>>> Of course the virgin solder melts at a much lower temperature
>>> than does the used solder.
>>>
>>> --Winston
>>
>>
>> Another reason to investigate these , but 1/2 deg C resolution fine for
> that
>> purpose. For general fault hotspot monitoring 0.1 deg C resolution ones
>> would be more useful but too expensive.

I dunno. Plus / minus 10 C is all that is necessary.
Your real indication is when you can lift the BGA off the board
without undue drama.

>> Another gizmo I must get around to
>> trying. Using the pyrometer of a PIR unit , setting in an insulated tube
>> shroud for pointing and then analogue fashion monitor the output in a
>> relative way, absolute temp not required for that purpose.

I understand that PIRs are A.C. devices, so one would have to be adept
at 'blinking' the shroud at the target while capturing the resulting
pulse from the PIR. As you say below, there is a much better solution.

> In this situation would thore remote IR thermometers pick up the temp of the
> board or the much higher temp of the hot air above it , but in line of
> "sight" of the sensor?

That is a good experiment to do.

I *guess* that the infrared emissivity of nitrogen *at that temperature*
is low enough that the infrared from the PCB would swamp it out.
I do not know for sure.

Product Idea! An infrared sensor mounted to your headband magnifier.

Lensed LCD chart presented as a heads-up display in your magnifier
continuously scrolls to show temperature at the center of your crosshairs.

--Winston

== 2 of 3 ==
Date: Fri, May 28 2010 9:03 am
From: "N_Cook"

Winston <Winston@bigbrother.net> wrote in message
news:htol4m030c9@news4.newsguy.com...
> On 5/28/2010 1:03 AM, N_Cook wrote:
> > N_Cook<diverse@tcp.co.uk> wrote in message
> > news:htnsgv$vpv$1@news.eternal-september.org...
> >> Winston<Winston@bigbrother.net> wrote in message
> >> news:htmhm6022th@news2.newsguy.com...
> >>> On 5/27/2010 7:42 AM, N_Cook wrote:
>
> (...)
>
> >>>> I like the solder paste indicator.
> >>>
> >>> It works 'better than nothing'.
> >>> Of course the virgin solder melts at a much lower temperature
> >>> than does the used solder.
> >>>
> >>> --Winston
> >>
> >>
> >> Another reason to investigate these , but 1/2 deg C resolution fine for
> > that
> >> purpose. For general fault hotspot monitoring 0.1 deg C resolution ones
> >> would be more useful but too expensive.
>
> I dunno. Plus / minus 10 C is all that is necessary.
> Your real indication is when you can lift the BGA off the board
> without undue drama.
>
> >> Another gizmo I must get around to
> >> trying. Using the pyrometer of a PIR unit , setting in an insulated
tube
> >> shroud for pointing and then analogue fashion monitor the output in a
> >> relative way, absolute temp not required for that purpose.
>
> I understand that PIRs are A.C. devices, so one would have to be adept
> at 'blinking' the shroud at the target while capturing the resulting
> pulse from the PIR. As you say below, there is a much better solution.
>
> > In this situation would thore remote IR thermometers pick up the temp of
the
> > board or the much higher temp of the hot air above it , but in line of
> > "sight" of the sensor?
>
> That is a good experiment to do.
>
> I *guess* that the infrared emissivity of nitrogen *at that temperature*
> is low enough that the infrared from the PCB would swamp it out.
> I do not know for sure.
>
> Product Idea! An infrared sensor mounted to your headband magnifier.
>
> Lensed LCD chart presented as a heads-up display in your magnifier
> continuously scrolls to show temperature at the center of your crosshairs.
>
> --Winston

The "ac" action is from the effect of the facetted mirrors in the PIR,
producing signal change when a moving warm object moves across the
boundaries of facet projected areas , a bit like fly's multi-lens eye
structured as a movement sensor

== 3 of 3 ==
Date: Fri, May 28 2010 9:44 am
From: Winston

On 5/28/2010 9:03 AM, N_Cook wrote:

(...)

> The "ac" action is from the effect of the facetted mirrors in the PIR,
> producing signal change when a moving warm object moves across the
> boundaries of facet projected areas , a bit like fly's multi-lens eye
> structured as a movement sensor

The way I misunderstand it is that the raw output of the sensor
itself is A.C. With or without the faceted lens, a hot object
presented to the sensor itself will result in a pulse, not
a D.C. offset as one expects of a Si photocell, for example.

I'm here to learn however, so I am open to new information.

--Winston

==============================================================================
TOPIC: Today's Lead Free Crap Solder Stories ...
http://groups.google.com/group/sci.electronics.repair/t/161210aa2275c858?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, May 27 2010 1:13 pm
From: mzenier@eskimo.com (Mark Zenier)

In article <htbace$3g7$1@news.eternal-september.org>,
William Sommerwerck <grizzledgeezer@comcast.net> wrote:
>> There is no doubt lead should not be used where it can wind
>> up being consumed by humans or animals. It's use in gasoline,
>> paint, dyes, ceramic glazes, cast toys, trinkets, etc is indefensible.
>> On the other hand, banning it's use in ICs, and circuit boards is
>asinine.
>
>The anti-lead argument is that too much electronic equipment is dumped in
>landfills, where acidic rainwater slowly dissolves the lead and it winds up
>in the water supply. This is plausible, but I've yet to see any proof.
>
>My argument has long been that the only dangerous substances are those that
>actually get into the environment.

But as I remember reading business magazines back 20-25 years ago, the
real push to get nasty stuff out of the waste streams were the companies
that built and wanted to run garbage incinerators, so they could get
free fuel to run electric generators. This would reduce their expenses
for sorting the stuff coming in and scrubbing the stuff going out.

Pretty easy to see how big outfits would, by lobbying the legislators
and bureaucrats, influence the various governments, and after a while,
the whole idea would get institutionalized. Even if opposition managed
to cut down on the number of incinerators actually built, the laws and
regulations live on.

Mark Zenier mzenier@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)

==============================================================================
TOPIC: HELP:Measuring refresh rate of PCBs
http://groups.google.com/group/sci.electronics.repair/t/786bc4e68b01617e?hl=en
==============================================================================

== 1 of 2 ==
Date: Fri, May 28 2010 9:41 am
From: stratus46@yahoo.com

On May 27, 8:49 am, "Caius" <bric...@yahoo.it> wrote:
> <stratu...@yahoo.com> ha scritto nel messaggionews:2709ccd5-9830-49f7-a95d-78179fc1eb3e@v37g2000vbv.googlegroups.com...
> On May 23, 12:05 am, who where <no...@home.net> wrote:
> >That lousy .1uF input to pin 2 cap is much better
> when it's 1uF and the 680K resistor on pin 6 works better at 470K.
>
> I tried a 1uf capacitor on pin 2 and nothing has changed (I didn't
obtain
> anymore the value of 15.575 KHz on pin 1..).A friend of mine told
me that he
> can measure correctly Vsync of 60 Hz with a LM1881 with exactly the
same
> circuit on NATIONAL datasheet (the same I'm trying).
> So,I can conclude, it's a issue of mine frequency counter...
>
> P.S.
> My friend uses a DMM which can measure frequency up to 20 MHz,
probably it
> is better (more sensible..) than my "assembled from kit" counter

You cannot make that assumption without a scope which unfortunately
you don't have. I'm only guessing but I bet your video has bad low
frequency tilt which shows of as the 'DC' of the back porch wandering
all over the place. Cause: bad capacitors somewhere in the video
chain. IIRC the Gennum chip includes clamps to guarantee sampling at
50% of the sync pulse meaning it's more tolerant of poor video. The
scope would tell all.

G²

== 2 of 2 ==
Date: Fri, May 28 2010 6:13 pm
From: "Arfa Daily"

<stratus46@yahoo.com> wrote in message
news:2e43c598-7127-469b-8e55-264cf7d6285d@o12g2000vba.googlegroups.com...
On May 27, 8:49 am, "Caius" <bric...@yahoo.it> wrote:
> <stratu...@yahoo.com> ha scritto nel
> messaggionews:2709ccd5-9830-49f7-a95d-78179fc1eb3e@v37g2000vbv.googlegroups.com...
> On May 23, 12:05 am, who where <no...@home.net> wrote:
> >That lousy .1uF input to pin 2 cap is much better
> when it's 1uF and the 680K resistor on pin 6 works better at 470K.
>
> I tried a 1uf capacitor on pin 2 and nothing has changed (I didn't
obtain
> anymore the value of 15.575 KHz on pin 1..).A friend of mine told
me that he
> can measure correctly Vsync of 60 Hz with a LM1881 with exactly the
same
> circuit on NATIONAL datasheet (the same I'm trying).
> So,I can conclude, it's a issue of mine frequency counter...
>
> P.S.
> My friend uses a DMM which can measure frequency up to 20 MHz,
probably it
> is better (more sensible..) than my "assembled from kit" counter

G²

Absolutely agreed on all points

Arfa

==============================================================================
TOPIC: Replacement EEPROM
http://groups.google.com/group/sci.electronics.repair/t/125f84cf645c46e6?hl=en
==============================================================================

== 1 of 3 ==
Date: Fri, May 28 2010 1:09 pm
From: Jeffrey D Angus

The TI TBP18SA030 is a 16 pin fusible link PROM.
32 X 8 bits.

Anybody got some suggestions on what I can use for a replacement?
The SN74S188 is supposed to be the same, but that doesn't solve
my problem.

I'm looking for something along the lines of 27C64 or such.
I don't mind making up a 16 -> 28 pin adapter.

Thanks
Jeff

--
"Egotism is the anesthetic that dulls the pain of stupidity."
Frank Leahy, Head coach, Notre Dame 1941-1954

http://www.stay-connect.com

== 2 of 3 ==
Date: Fri, May 28 2010 5:37 pm
From: Cydrome Leader

Jeffrey D Angus <jangus@suddenlink.net> wrote:
> The TI TBP18SA030 is a 16 pin fusible link PROM.
> 32 X 8 bits.
>
> Anybody got some suggestions on what I can use for a replacement?
> The SN74S188 is supposed to be the same, but that doesn't solve
> my problem.

it looks like still make it in extended temp rage in a ceramic case as
JBP18S030MJ. I wonder who still uses these or what they're fixing
with them.

http://focus.ti.com/lit/ds/symlink/jbp18s030.pdf

== 3 of 3 ==
Date: Fri, May 28 2010 7:17 pm
From: Jeff Liebermann

On Fri, 28 May 2010 15:09:48 -0500, Jeffrey D Angus
<jangus@suddenlink.net> wrote:

>The TI TBP18SA030 is a 16 pin fusible link PROM.
>32 X 8 bits.
>
>Anybody got some suggestions on what I can use for a replacement?
>The SN74S188 is supposed to be the same, but that doesn't solve
>my problem.
>
>I'm looking for something along the lines of 27C64 or such.
>I don't mind making up a 16 -> 28 pin adapter.

74S288 by National Semi and 82S123 by Pilips and Signetics.

Make me rich and I'll send you the official bipolar PROM bag phone
programmer. Are you programming an MCX-90/100? There's also a
Standard low-band radio I have buried somewhere that uses this bipolar
PROM. You might ask on the Batlabs forum.

$10/ea from Jameco:
<http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_48717_-1>

This might be useful:
<http://www.biltronix.com/battlezone_2.html>

I found this in my bag phone programming collection:

BRAND OPEN COL. TRI-STATE OPEN COL. TRI-STATE
=============================================================================
Signetics 82S23 82S123
Texas Inst. 74S188 74S288 TBP18SA030 TBP18S030
AMD AM27LS18 AM27LS19 AM27S18 AM27S19
Texas Inst. TBP38SA030 TBP38S030
Harris HM7602 HM7603
MMI 53/6330 53/6331
MMI 53/63S080 53/63S081
NSC DM54S188 DM54S288 DM74S188
NSC DM82S23 DM82S123
Motorola This is for a special NAM used in some Motorolas. Requires
an adapter.
Fujitsu MB7056 MB7051

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

==============================================================================
TOPIC: 40Gb Western Digital hard drive
http://groups.google.com/group/sci.electronics.repair/t/d11c27dd9c7d80c0?hl=en
==============================================================================

== 1 of 4 ==
Date: Fri, May 28 2010 2:47 pm
From: mike

Hi,

Hoping to benefit from the collective wisdom of the group with regard
to computer systems. So far over a period of about 2 years I've
brought home from the scrapyard three different E-machine computers,
all of which had a blown-up power supply made by Bestec - I get the
feeling that that is reason enough to turn around and run the other
way, once you see the 'Bestec' name, since out of those three systems,
the only thing that was still usable that I have found was one 128Mb
stick of ram. Until the other day...

I was sorting out what I could drop off at the recyclers, scrapyard
and landfill, when I once again hooked up a Western Digital 40 Gb hard
drive, and once again got a bunch of grief from it, until I put a WD
utilities disk in the floppy drive, just to run the mfg's utilities on
it before tossing it. I selected for the program "install EZbios" -
just because I hadn't done that before, ya know? Next, I told it to
restore track 0 (zero), which it seemed happy enough to do. Long
story short, this drive which I couldn't even complete any kind of
diagnostic test on previously, I was now able to load Ubuntu on, and I
used it for 3 days in a row for my usual news-gathering activities.
Then, this morning in the middle of my readings the system went brain-
dead on me.

Of course, the first thing I suspect is the HD. I shut the system
down and let it sit for 15 or 20 minutes, then checked to make sure
there's no lose connectors or the like, nothing is unusually warm, and
then unplug and replug everything (possibly the stick of ram wasn't
quite seated right, everything else seemed OK) and started it back up
- booted into Ubuntu 8.04 fine, I let it idle awhile then shut it down
for the day. I can hardly wait to see what tomorrow may bring 8^).

Just wondering if any one had any info or thoughts on why the HD was
seemingly revived by the 'install EZbios' and 'restore track zero'
moves that I put on it, and also what I might do to make a more
effective repair to this drive, or at least a diagnostic that will
tell me if something's wrong with it - I really think it would benefit
from a low-level format but I don't have a program for that at the
moment. The Western Digital diagnostics pronounce it to be error-
free.

Thanks,
Mike

== 2 of 4 ==
Date: Fri, May 28 2010 3:01 pm
From: Meat Plow

On Fri, 28 May 2010 14:47:25 -0700, mike wrote:

> Hi,
>
> Hoping to benefit from the collective wisdom of the group with regard to
> computer systems. So far over a period of about 2 years I've brought
> home from the scrapyard three different E-machine computers, all of
> which had a blown-up power supply made by Bestec - I get the feeling
> that that is reason enough to turn around and run the other way, once
> you see the 'Bestec' name, since out of those three systems, the only
> thing that was still usable that I have found was one 128Mb stick of
> ram. Until the other day...
>
> I was sorting out what I could drop off at the recyclers, scrapyard and
> landfill, when I once again hooked up a Western Digital 40 Gb hard
> drive, and once again got a bunch of grief from it, until I put a WD
> utilities disk in the floppy drive, just to run the mfg's utilities on
> it before tossing it. I selected for the program "install EZbios" -
> just because I hadn't done that before, ya know? Next, I told it to
> restore track 0 (zero), which it seemed happy enough to do. Long story
> short, this drive which I couldn't even complete any kind of diagnostic
> test on previously, I was now able to load Ubuntu on, and I used it for
> 3 days in a row for my usual news-gathering activities. Then, this
> morning in the middle of my readings the system went brain- dead on me.
>
> Of course, the first thing I suspect is the HD. I shut the system down
> and let it sit for 15 or 20 minutes, then checked to make sure there's
> no lose connectors or the like, nothing is unusually warm, and then
> unplug and replug everything (possibly the stick of ram wasn't quite
> seated right, everything else seemed OK) and started it back up - booted
> into Ubuntu 8.04 fine, I let it idle awhile then shut it down for the
> day. I can hardly wait to see what tomorrow may bring 8^).
>
> Just wondering if any one had any info or thoughts on why the HD was
> seemingly revived by the 'install EZbios' and 'restore track zero' moves
> that I put on it, and also what I might do to make a more effective
> repair to this drive, or at least a diagnostic that will tell me if
> something's wrong with it - I really think it would benefit from a
> low-level format but I don't have a program for that at the moment. The
> Western Digital diagnostics pronounce it to be error- free.
>
> Thanks,
> Mike

The problems and solutions may be coincidental. There isn't much you can
do to make the repair more reliable nor are there consumer grade
diagnostics that can pinpoint problems.
I revived a 120 gig Maxtor a week ago by swapping the electronics with
an exact twin I had in the scrap box. The drive just quit. Made no noise,
platters didn't spin. Replaced the electronics board, problem solved
and friend didn't lose his OS or data.

== 3 of 4 ==
Date: Fri, May 28 2010 3:16 pm
From: D Yuniskis

Hi Mike,

mike wrote:
> Hoping to benefit from the collective wisdom of the group with regard
> to computer systems. So far over a period of about 2 years I've
> brought home from the scrapyard three different E-machine computers,
> all of which had a blown-up power supply made by Bestec - I get the
> feeling that that is reason enough to turn around and run the other
> way, once you see the 'Bestec' name, since out of those three systems,
> the only thing that was still usable that I have found was one 128Mb
> stick of ram. Until the other day...

eMachines are... well, we won't go there! :-/

> I was sorting out what I could drop off at the recyclers, scrapyard
> and landfill, when I once again hooked up a Western Digital 40 Gb hard
> drive, and once again got a bunch of grief from it, until I put a WD
> utilities disk in the floppy drive, just to run the mfg's utilities on
> it before tossing it. I selected for the program "install EZbios" -
> just because I hadn't done that before, ya know? Next, I told it to
> restore track 0 (zero), which it seemed happy enough to do. Long
> story short, this drive which I couldn't even complete any kind of
> diagnostic test on previously, I was now able to load Ubuntu on, and I
> used it for 3 days in a row for my usual news-gathering activities.
> Then, this morning in the middle of my readings the system went brain-
> dead on me.

What machine did ou have this running in?

I think drive manufacturers cite something like 40% (? more?)
of drive returns have "No defect found". (something to keep in
mind).

The first thing I would do is move the drive to a known
*reliable* machine (perhaps on the secondary controller
or as a slave, etc.) and see how well it runs. You
may discover that the machine you were having problems
with was the problem! (bad caps, bad power supply, etc.)

> Of course, the first thing I suspect is the HD. I shut the system
> down and let it sit for 15 or 20 minutes, then checked to make sure
> there's no lose connectors or the like, nothing is unusually warm, and
> then unplug and replug everything (possibly the stick of ram wasn't
> quite seated right, everything else seemed OK) and started it back up
> - booted into Ubuntu 8.04 fine, I let it idle awhile then shut it down
> for the day. I can hardly wait to see what tomorrow may bring 8^).
>
> Just wondering if any one had any info or thoughts on why the HD was
> seemingly revived by the 'install EZbios' and 'restore track zero'
> moves that I put on it, and also what I might do to make a more
> effective repair to this drive, or at least a diagnostic that will
> tell me if something's wrong with it - I really think it would benefit
> from a low-level format but I don't have a program for that at the
> moment. The Western Digital diagnostics pronounce it to be error-
> free.

== 4 of 4 ==
Date: Fri, May 28 2010 7:04 pm
From: Jeff Liebermann

On Fri, 28 May 2010 14:47:25 -0700 (PDT), mike
<mlightner@survivormail.com> wrote:

>brought home from the scrapyard three different E-machine computers,
>all of which had a blown-up power supply made by Bestec

e-Machines are not the best quality. The power supplies and fans are
the first to go. CDROM and floppy are next. After that, the
motherboard.

>I was sorting out what I could drop off at the recyclers, scrapyard
>and landfill, when I once again hooked up a Western Digital 40 Gb hard
>drive,

Model number? Series?
The Protege series were tolerable. Protoge would last about 4 years
and blow up. The Caviar series would last perhaps 2 years and blow
up. About 1/3 of the pile is WD, mostly 40GB but some 80 and 120GB.
<http://802.11junk.com/jeffl/pics/drivel/disk-drives.jpg>
(New drives, boxed drives, and SCSI arrays are buried elsewhere).

>Then, this morning in the middle of my readings the system went brain-
>dead on me.

What does that mean? Did the drive fail, or was there some other
problem? It's highly likely that the drive failed.

>- booted into Ubuntu 8.04 fine,

Ummmm.... Ubuntu 10.04 is the current version.

>The Western Digital diagnostics pronounce it to be error-
>free.

The WD diagnostics will pronounce a failing drive to be good. What
did you expect? Fire up SmartMonTools in Ubuntu and extract the
S.M.A.R.T. statistics. You'll find one of three possible results,
depending on WD drive model:
1. Lots of errors and pronouncement of imminent failure. This is
what you get with the later drives. I don't think any of the 40GB
drives are late enough to produce an honest result.
2. Absolutely perfect drive with no errors. This is what I usually
see. WD lies on its S.M.A.R.T. stats.
3. Can't obtain S.M.A.R.T. That's what I see when someone has
juggled controller cards. I also see that when there's a controller
failure.

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

==============================================================================
TOPIC: 5 Ghz Routers Cause Nausea & Dizziness - To You Too?
http://groups.google.com/group/sci.electronics.repair/t/7eb236bd552e9cf3?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, May 28 2010 5:30 pm
From: "Michael A. Terrell"

Jeff Liebermann wrote:
>
> On Thu, 27 May 2010 18:18:41 -0400, "Michael A. Terrell"
> <mike.terrell@earthlink.net> wrote:
>
> >Jeff Liebermann wrote:
> >>
> >> On Wed, 26 May 2010 14:17:56 -0700, David Nebenzahl
> >> <nobody@but.us.chickens> wrote:
> >>
> >> >In my youngah days, I could sometimes hear the high-pitched whine of
> >> >television receivers (horizontal scan, right? ~15kHz?). Not any more.
> >>
> >> 15.734 KHz or something like that. When I was about 12, I built a
> >> Heathkit FM stereo multiplex adapter. I could hear the 19 Khz pilot
> >> tone out of the tweeter. I couldn't figure out why nobody else could.
>
> > It didn't have a 19 KHz filter in the output?
>
> Yes, it did. However, I still could hear a tone, which only appeared
> on stereo stations. My guess(tm) is that either:
> 1. I goofed in the assembly or wiring.
> 2. The filter was mistuned by me (highly likely as I recall tuning by
> ear and breaking a few hex ferrite slugs).

Very few hobbyist had 'Ultrasonic Spectrum Analyzers' or 'Frequency
Selective Voltmeters' to properly align the trap. I've owned both, and
they are very handy tools. :)

> 3. The design had problems.
> 4. All the above.

Or:

5: It was a Heathkit. Not all of their designs were great.

--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

==============================================================================

You received this message because you are subscribed to the Google Groups "sci.electronics.repair"
group.

To post to this group, visit http://groups.google.com/group/sci.electronics.repair?hl=en

To unsubscribe from this group, send email to sci.electronics.repair+unsubscribe@googlegroups.com

To change the way you get mail from this group, visit:
http://groups.google.com/group/sci.electronics.repair/subscribe?hl=en

To report abuse, send email explaining the problem to abuse@googlegroups.com

==============================================================================
Google Groups: http://groups.google.com/?hl=en

Electronics

sci.electronics.repair - 24 new messages in 10 topics - digest

No Response to "sci.electronics.repair - 24 new messages in 10 topics - digest"

Post a Comment

Blog Roll

Blog Archive