sci.electronics.repair - 25 new messages in 10 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: Porcelain thermally conductive insulators ?
http://groups.google.com/group/sci.electronics.repair/t/b69decd6bfa03d8b?hl=en
==============================================================================

== 1 of 3 ==
Date: Thurs, Apr 21 2011 12:15 am
From: "N_Cook"

josephkk <joseph_barrett@sbcglobal.net> wrote in message
news:e79vq6lnae2qp2p36p8dskjftl2bsmb4ad@4ax.com...
On Mon, 18 Apr 2011 17:36:42 +0100, Baron <baron@linuxmaniac.net> wrote:

>N_Cook Inscribed thus:
>
>> 1.8mm slabs of porcelain under TO220 devices.
>
>I would check that ! Its more likely that they are Beryllium_oxide !
><http://en.wikipedia.org/wiki/Beryllium_oxide>
>
>> Tried grinding a clearance notch on the side of one
>> pad but got nowhere as ceramic.
>> Not only that but I had no trouble holding the slab in fingers while
>> trying to grind a slot, it was barely getting warm - good thermal
>> insulator or small grinding wheel not generating heat as not cutting
>> into the material ?
>
>The dust from grinding or abrading Beryllium_oxide is highly toxic !

BeO is very expensive. I would be very surprised to find any in such
application.

++++

These were not made for the job. They have a hole for either TO220 or TOP66
maybe size transistors . So too wide for this use and the hole is not used
. The layout does not mean they have to be 1.8mm thick , any thickness from
mica up could have been accommodated. Normally you would go for the thinnest
of insulators.

== 2 of 3 ==
Date: Thurs, Apr 21 2011 1:15 pm
From: Baron

josephkk Inscribed thus:

> On Mon, 18 Apr 2011 17:36:42 +0100, Baron <baron@linuxmaniac.net>
> wrote:
>
>>N_Cook Inscribed thus:
>>
>>> 1.8mm slabs of porcelain under TO220 devices.
>>
>>I would check that ! Its more likely that they are Beryllium_oxide !
>><http://en.wikipedia.org/wiki/Beryllium_oxide>
>>
>>> Tried grinding a clearance notch on the side of one
>>> pad but got nowhere as ceramic.
>>> Not only that but I had no trouble holding the slab in fingers while
>>> trying to grind a slot, it was barely getting warm - good thermal
>>> insulator or small grinding wheel not generating heat as not cutting
>>> into the material ?
>>
>>The dust from grinding or abrading Beryllium_oxide is highly toxic !
>
> BeO is very expensive. I would be very surprised to find any in such
> application.

I wonder how much 12 dozen TO3 BeO insulators would be worth ?

--
Best Regards:
Baron.

== 3 of 3 ==
Date: Thurs, Apr 21 2011 1:24 pm
From: Baron

N_Cook Inscribed thus:

> Baron <baron@linuxmaniac.net> wrote in message
> news:ioni74$fk3$1@dont-email.me...
>> N_Cook Inscribed thus:
>>
>> > I had to get inside that amp again, yet another PbF problem from
>> > next to zero insertion force speaker connector at the PA 4 removal
>> > & inserts by me was enough , only 6 months old.
>> > The slabs pass red laser pointer light, but then on checking but so
>> > does the ceramic of high temp "choc block".
>> > These slabs are more trnasmissive and scatter the light throughout
>> > the slab not just the entry and exit area of the chock block.
>>
>> Mmm ! Interesting. I have a small quantity of boxed TO3 BeO
>> insulators. I'll have to get one out and see.
>>
>> --
>> Best Regards:
>> Baron.
>
>
> It maybe a function of thickness, these being 1.8mm thick slabs rather
> than wafers

I cracked open a box of TO3 BeO insulators this afternoon...
I was very surprised ! I tried shining a red laser pointer through one.
Its weird but they do seem to glow but no direct light through it.

Putting one against a small hole in a cardboard box and viewing the sun
shows nothing, no light, nothing. Most odd !

--
Best Regards:
Baron.

==============================================================================
TOPIC: Where's best source for laptop battery?
http://groups.google.com/group/sci.electronics.repair/t/e22e3559f49b976b?hl=en
==============================================================================

== 1 of 5 ==
Date: Thurs, Apr 21 2011 3:25 am
From: Bob Villa

On Apr 20, 10:08 pm, Robert Macy <m...@california.com> wrote:
> Where is the best source for a laptop battery?
>
> You've been through the battles and know where to get a laptop battery
> [inside US]
> 10.8V 3600mAH
> 02k6627
> for the IBM Thinkpad

Here's a place that is cheap for a compatible battery, but I have
never bought one from them. The seller has a decent rating.

http://www.meritline.com/laptop-batteries---c-14211.aspx?mID=152&min=&max=&PriceOrder=12&issy=1&top8=0&imageField2.x=13&imageField2.y=11

== 2 of 5 ==
Date: Thurs, Apr 21 2011 3:35 am
From: Bob Villa

Model search http://www.meritline.com/s-5483-laptop-Battery-for-ibm.aspx

== 3 of 5 ==
Date: Thurs, Apr 21 2011 9:03 am
From: Robert Macy

On Apr 21, 3:35 am, Bob Villa <pheeh.z...@gmail.com> wrote:
> On Apr 20, 10:08 pm, Robert Macy <m...@california.com> wrote:
>
> > Where is the best source for a laptop battery?
>
> > You've been through the battles and know where to get a laptop battery
> > [inside US]
> > 10.8V 3600mAH
> > 02k6627
> > for the IBM Thinkpad
>
> Model searchhttp://www.meritline.com/s-5483-laptop-Battery-for-ibm.aspx

Thank you for the URLs

Cost at $51.99 but is for the more storage version of 4400mAH [not
original 3600mAH]
plus free standard shipping, so cost is comparable.

Easy website to navigate, easy website to order from

Their return policy is austere, but makes sense if they;re running on
low margins.

will let you know of exeperience

Regards,

== 4 of 5 ==
Date: Thurs, Apr 21 2011 9:20 am
From: chrisj.doran@proemail.co.uk

On Apr 21, 5:03 pm, Robert Macy <m...@california.com> wrote:
> On Apr 21, 3:35 am, Bob Villa <pheeh.z...@gmail.com> wrote:
>
> > On Apr 20, 10:08 pm, Robert Macy <m...@california.com> wrote:
>
> > > Where is the best source for a laptop battery?
>
> > > You've been through the battles and know where to get a laptop battery
> > > [inside US]
> > > 10.8V 3600mAH
> > > 02k6627
> > > for the IBM Thinkpad
>
> > Model searchhttp://www.meritline.com/s-5483-laptop-Battery-for-ibm.aspx
>
> Thank you for the URLs
>
> Cost at $51.99 but is for the more storage version of 4400mAH [not
> original 3600mAH]
> plus free standard shipping, so cost is comparable.
>
> Easy website to navigate, easy website to order from
>
> Their return policy is austere, but makes sense if they;re running on
> low margins.
>
> will let you know of exeperience
>
> Regards,

Be aware that there is an unproven suspicion that the 4400mAH
batteries may be the source of "blink of death" failures. The fear is
that they take too much current out of the charging circuitry and blow
a chip, fuse, or resistor, which seem to be found with this fault.

What is other people's experience with these enhanced storage
batteries? I bought one, but I'm afraid to use it.

Chris

== 5 of 5 ==
Date: Thurs, Apr 21 2011 9:22 am
From: Bob Villa

On Apr 21, 11:03 am, Robert Macy <m...@california.com> wrote:
> On Apr 21, 3:35 am, Bob Villa <pheeh.z...@gmail.com> wrote:
>
> > On Apr 20, 10:08 pm, Robert Macy <m...@california.com> wrote:
>
> > > Where is the best source for a laptop battery?
>
> > > You've been through the battles and know where to get a laptop battery
> > > [inside US]
> > > 10.8V 3600mAH
> > > 02k6627
> > > for the IBM Thinkpad
>
> > Model searchhttp://www.meritline.com/s-5483-laptop-Battery-for-ibm.aspx
>
> Thank you for the URLs
>
> Cost at $51.99 but is for the more storage version of 4400mAH [not
> original 3600mAH]
> plus free standard shipping, so cost is comparable.
>
> Easy website to navigate, easy website to order from
>
> Their return policy is austere, but makes sense if they;re running on
> low margins.
>
> will let you know of exeperience
>
> Regards,

Thanks, I bought things like: ext. drive cases,flashlights,IDE to SATA
adapters,laptop power brick,and printer ink. And they have been very
good so far. I will be needing a Dell battery..so I will appreciate
the feedback.

==============================================================================
TOPIC: Western Digital 1TB Passport for sale and pickup?
http://groups.google.com/group/sci.electronics.repair/t/f7f57fc34a118ff6?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Apr 21 2011 4:39 am
From: Keith

All:
If you or anyone you know has a WD 1TB Passport for sale and pickup here in the San Diego County
area, please email me. I will pay a CASH for it. Thank you.

Keith

==============================================================================
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http://groups.google.com/group/sci.electronics.repair/t/adefe85302e935ef?hl=en
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== 1 of 1 ==
Date: Thurs, Apr 21 2011 5:11 am
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==============================================================================
TOPIC: Question about GAL16V8D
http://groups.google.com/group/sci.electronics.repair/t/599169a495125287?hl=en
==============================================================================

== 1 of 3 ==
Date: Thurs, Apr 21 2011 6:27 am
From: "caius"

Hi all,
I'm wondering what is the limit of successive writings and erasing of a
GAL16V8D device.Thanks

== 2 of 3 ==
Date: Thurs, Apr 21 2011 6:44 am
From: JW

On Thu, 21 Apr 2011 15:27:07 +0200 "caius" <briccus@yahoo.it> wrote in
Message id: <4db030af$0$18250$4fafbaef@reader2.news.tin.it>:

>Hi all,
>I'm wondering what is the limit of successive writings and erasing of a
>GAL16V8D device.Thanks

According to the Lattice datasheet, 100 cycles.

== 3 of 3 ==
Date: Thurs, Apr 21 2011 6:58 am
From: Rich Webb

On Thu, 21 Apr 2011 15:27:07 +0200, "caius" <briccus@yahoo.it> wrote:

>Hi all,
>I'm wondering what is the limit of successive writings and erasing of a
>GAL16V8D device.Thanks

As a relatively old device, the limit may be in the 10's or 100's. A
similar chip, Atmel's ATF16V8CZ, lists 100 as the reprogram limit.

--
Rich Webb Norfolk, VA

==============================================================================
TOPIC: Replacing camera flash trigger MOSFET - 2SK2715
http://groups.google.com/group/sci.electronics.repair/t/2272695d470a3c81?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Apr 21 2011 8:08 am
From: Peabody

larry moe 'n curly says...

> Any luck finding a substitute in a power supply, such as
> one for a PC? 500V MOSFETs are common in them.

> I think you have to use a 500V transistor for the 12V
> flash for the same reason vehicle ignition systems use
> transistors rated for hundreds of volts on the 12V side
> of the ignition coil -- big voltage spikes.

> You could practice soldering the flexible circuit boards
> of junked PC keyboards. I think they're made of mylar
> polyester, while that brown flexible plastic in your
> camera is probably kapton, a plastic with a much higher
> melting point.

Thanks for the suggestions. I succeeded in desoldering the
Gate lead of the transistor so I could test it
out-of-circuit. But, it tested ok. So that wasn't the
problem after all.

However, after reassembly and doing a global reset of the
camera settings, it's working properly now.

==============================================================================
TOPIC: Lead free solder
http://groups.google.com/group/sci.electronics.repair/t/7ff46ef49e9b7de3?hl=en
==============================================================================

== 1 of 8 ==
Date: Thurs, Apr 21 2011 2:07 pm
From: "Charles"

Has this had any impact on repair and rework of electronic devices and
equipment?

== 2 of 8 ==
Date: Thurs, Apr 21 2011 2:16 pm
From: Meat Plow

On Thu, 21 Apr 2011 17:07:11 -0400, Charles wrote:

> Has this had any impact on repair and rework of electronic devices and
> equipment?

Yes.

--
Live Fast Die Young, Leave A Pretty Corpse

== 3 of 8 ==
Date: Thurs, Apr 21 2011 4:51 pm
From: "Dave M"

Charles wrote:
> Has this had any impact on repair and rework of electronic devices and
> equipment?

Yes... a quite detrimental effect. Google for "tin whiskers".

--
David
dgminala at mediacombb dot net

== 4 of 8 ==
Date: Thurs, Apr 21 2011 6:01 pm
From: Spamm Trappe

On Thu, 21 Apr 2011 17:07:11 -0400, Charles wrote:
> Has this had any impact on repair and rework of electronic
> devices and equipment?

You really should do a Google Groups search before asking.

== 5 of 8 ==
Date: Thurs, Apr 21 2011 6:43 pm
From: "Phil Allison"

"Charles"
>
> Has this had any impact on repair and rework of electronic devices and
> equipment?

** The amount of work has increased.

Pb free solder is often brittle and cracks easily under thermal cycling,
stress or vibrations.

Standard procedure round here is to remove it with wick and use some real
60/40 Savbit solder to make the repair.

.... Phil

== 6 of 8 ==
Date: Thurs, Apr 21 2011 10:19 pm
From: mike

Phil Allison wrote:
> "Charles"
>> Has this had any impact on repair and rework of electronic devices and
>> equipment?
>
> ** The amount of work has increased.
>
> Pb free solder is often brittle and cracks easily under thermal cycling,
> stress or vibrations.
>
> Standard procedure round here is to remove it with wick and use some real
> 60/40 Savbit solder to make the repair.
>
>
>
> .... Phil
>
>
Arent't there some legal issues with that?

== 7 of 8 ==
Date: Thurs, Apr 21 2011 10:26 pm
From: "Phil Allison"

"mike"
Phil Allison wrote:
>> "Charles"
>>> Has this had any impact on repair and rework of electronic devices and
>>> equipment?
>>
>> ** The amount of work has increased.
>>
>> Pb free solder is often brittle and cracks easily under thermal cycling,
>> stress or vibrations.
>>
>> Standard procedure round here is to remove it with wick and use some real
>> 60/40 Savbit solder to make the repair.
>>
>
> Arent't there some legal issues with that?

**You tell us - fuckhead

But round here = Australia where the RoHS directive is not law.

Nor is it law in Japan, North America and most places.

And would not give a shit if it was.

.... Phil

== 8 of 8 ==
Date: Thurs, Apr 21 2011 10:41 pm
From: "Phil Allison"

"Phil Allison"

** A small correction....

**You tell us - fuckhead

But round here = Australia where the RoHS directive is not law.

Nor is it law in Japan, North America and most places.

And I would not give a shit if it was.

.... Phil

==============================================================================
TOPIC: Electric mower battery
http://groups.google.com/group/sci.electronics.repair/t/a079faa9f877be2f?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Apr 21 2011 11:39 pm
From: "Guv Bob"

Many thanks fellers for the lessons on batteries! I am now 3-5 times smarter than I wuz (about batteries)! Which ain't saying that much according to the lovely wife. LOL!!! Really appreciate pointing me to the less expensive sources and alternatives too.

Bob

"Guv Bob" <guvbob2003@YAHOOOOOOOOEY.com> wrote in message news:Da2dnVQ04MtyNTXQnZ2dnUVZ_vqdnZ2d@earthlink.com...
Got a dumb question.... I have an electric mower that uses two 12V lead acid batteries wired in series to give 24V. The batteries are marked 18Ah. Cost is around $100 for one 12v, or $140 for 2 in series, including shipping.

For the same money or less, I can get two std 12v car batteries and end up with more amp hours to boot, which would be good for a mower. Heavier to push around, but that's not a problem.

I don't know nuthin about how amp-hours work - reckon this would be a good idea? Anyone had experience with this kind of thing before?

Bob

==============================================================================
TOPIC: new star
http://groups.google.com/group/sci.electronics.repair/t/436cbfaa168362a6?hl=en
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