audio recording on IC -help wanted

[Eeyore]

Pieter wrote:

Eeyore wrote:
Pieter wrote:
Eeyore wrote:
Pieter wrote:
Eeyore wrote:
Pieter wrote:

The 8051 does not have an internal oscillator.

What do you mean ? It has an inverter stage designed for clock oscillator use
connected to pins xtal1 and xtal2.


No internal crystal. It has the inverter etc, but always needs an
external crystal. Of course you can also feed it with an external
oscillator.

Can you provide an example of any IC that has an internal crystal ?


I wrote that it does NOT have an internal crystal, like most other
parts. But the 8051 also has no internal RC oscillator. It needs
external parts.

It has the required internal active parts for either a crystal or ceramic resonator
clock oscillator. That's all that matters.

The OP has no interest in hypothetical RC oscillators that don't exist in standard
8051s. Stop talking rubbish.


Follow you own advice and stay away here. Go troll elsewhere.

Go screw yourself.

You have offered the sum total of ZERO useful advice in this thread.

You're a pontificating nitwit.

Graham

 

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[Bill Johnson]

sorry. I thought you guys might know

 

[JosephKK]

On Sat, 07 Jun 2008 12:58:06 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

JosephKK wrote:
On Sat, 07 Jun 2008 08:51:39 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

JosephKK wrote:
On Fri, 6 Jun 2008 17:44:04 -0700 (PDT), whit3rd <whit3rd@gmail.com
wrote:

On Jun 5, 11:54 am, Joerg <notthisjoerg...@removethispacbell.net
wrote:
Hello All,

Does anyone have a link or hint regarding shielded CAT-5 which is as
flexible as the better non-shielded patch cables?
Mainly Ethernet terminations aren't shielded, so there's
no 'ground' connection in the RJ-45 plug. If you go to the
shrounded connectors, the compatible shielded cable is stiff
jacket/foil-shield over (?solid) wires.

Could you ground a braided tube at the chassis and on the
drawer, and just route a stranded CAT5 cable through that?
I have this joy/frustration with people that beat me at thinking
outside of the box.

That's what they have in the system now. It's a pain in the neck in
production (very complex mechanics) and then there is the concern of
chafing.

Adhesively bond the mesh to the jacket. Select the adhesive
carefully.


Production folks don't like that kind of stuff

Anyhow, as posted in my response to Graham we've found a domestic source
that might work:

http://www.sabcable.com/categoryDetail.php?catID=2

A lot of engineering is based on finding a solution NOW. Rather than
analyzing everything to death (the academic approach). Let us know
what the results are.

 

[GregS]

In article <JKyxzL.GtG@news.boeing.com>, "Albert Manfredi" <albert.e.manfredi@nospam.com> wrote:

"Mr.T" <MrT@home> wrote in message
news:46933bf7$0$6925$afc38c87@news.optusnet.com.au...

"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:46933246.64CB7FA6@hotmail.com...
4500K is still somewhat blue for most peoples' taste.

You must really hate daylight then!

Daylight for artificial lighting is rather annoying. Maybe humans have
been conditioned to want warmer lighting at night, after 10s of
thousands of years of getting by with fire as light source at night.

Not only that, but pinpoint sources of light have glare. Daylight is dispersed.

greg


>I find the 3000K of my CFLs to be barely warm enough.

 

[John Larkin]

On Fri, 25 Jul 2008 14:26:18 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

John Larkin wrote:
On Wed, 23 Jul 2008 09:59:26 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Hello All,

Got a circuit where in hindsight the client decided they need >10 times
the juice than initially spec'd. This was truly unforeseen for them and
we have to make it work at least for a proto series. Of course, now all
those 0805 resistors in the power path would exceed their usual 1/8W
spec. Found these at 1/3W:

http://www.susumu.co.jp/english/pdf/products-j01-07.pdf

I plan to run them around 200-250mW. Was expecting those to be really
tall to vent off some heat but they are surprisingly flat, only 0.4mm
high. Will this become a heat problem on FR-4 for stuff that can run
24/7? Any experience?


Can I interest you in 0402 at 10 watts? Or 0505 at 50 watts?

http://www.emct.com/microwavepassivecomponents-a43445.html


Ouch! That ought to do it for an impressive meltdown procedure on FR4.
Reminds me of a tube in a ceramic socket on phenolic. I was still a kid,
blissfully unaware of the limitations of some materials. Transistors
were very expensive in Germany so I built most stuff from salvaged
tubes, plucked out of radios and TV sets. Well, this thing worked for
months. Then one fine day there was fireworks, hissing and smoke. The
ceramic socket including tube had fallen through the charred hole that
had developed. Now I knew where that faint "amperage smell" was coming
from. Luckily the plate connector was up top and the tube fell in, but
didn't tip over. Cuz I had "economized" on the power supply and ran
straight from 230V mains into a voltage doubler. The fuse was, ahem,
home made.

My first ever job interview, I made the comment that I generally
preferred tubes (which I got free) to transistors, because transistors
were too easy to blow up. The prig said "that won't do" and didn't
hire me. Next interview, I said the same thing and that guy laughed
and did hire me. I designed about $100M of stuff for the second guy.

John

 

[Lostgallifreyan]

Bob Pownall <repownall@netscape.net> wrote in
news:13c8q567a43t871@corp.supernews.com:

Lostgallifreyan wrote:
snip

The first response I got back listed these (non-HP) sources:
http://www.ambry.com/page/category_hp.asp?strHpCategory=printer&strHpKe
yword=Manual&text=Printer%20%3E%20Manual&cat=printers

http://www.jpcparts.com/page/category_hp.asp?strHpCategory=printer&strH
pKeyword=Manual&text=Printer%20%3E%20Manual&cat=printers

http://www.everprint.com/online/simdetail.asp?partno=07440-90000

http://www.partshere.com/online/detail.asp?partno=07440-90000

Since you've already said you're willing to pay for manuals, these (or
something like them) might be your best option.

Bob Pownall

Thankyou. I'm willing to pay, but I'll pass on those, having looked at
them. They might not have any. Even if they do, they'll set the price to as
high as they like the momemt I request a quote, then add all the surcharges
and handling charges and brokerage charges they can think of.

I'll wait till someone on eBay offers one. Can't negotiate with people who
run vast virtual carts. Maybe on eBay, I can. eBay also contractually binds
a seller to have the item before trying to sell it for a start.

 

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[jakdedert]

Don McKenzie wrote:

Hamad bin Turki al Salami wrote:

I have a device with what appears to be a defective LCD. There's a
splotch that's visible even if the unit is powered off. When it's
powered on, there's a horizontal line and a vertical line that both
appear faint and occasionally show stray junk. I'm assuming
something is wrong with the pixel where they intersect, which
is near the splotch.

The company that makes this device sells replacement LCDs for $205,
which is not cost effective. I'm trying to find a third party
replacement, hopefully for under $50. However, it seems that
320 x 80 LCDs are as rare as hen's teeth.

Two questions:
1. Does anyone know of a source of 320 x 80 LCDs?
2. How likely is it that if I buy a 320 x 80 LCD with the same physical
size, could I use it as a drop in replacement for my unit.

My understanding is that many LCDs tend to use the same controllers
and for something as rare as a 320 x 80, it's fairly likely that
one I find will be compatible with my device. Am I off base here?

In the next two days I should have 320 x 240 LCD's, with serial
controllers, but that won't help you I wouldn't think.

have a look at:
http://www.kentdisplays.com/product/standard_list.htm
320 x 80 LCD
that may be what you are after.


In the meantime, you could post the brand and model # of the gear in

question. Someone could have a replacement without knowing the
resolution specs of the lcd it contains.....

jak

 

[Graham W]

Yianni wrote:

Which is the part code of this ic? I searched for the printed code
but found nothing. I think it's a serial eeprom. I'm looking for its
datasheet. http://users.forthnet.gr/ath/johnge/temp/chip62.jpg

The top one is the model number (or part of it),the 2nd is the
batch number and the last is a date code.

HTH

--
--
Graham W http://www.gcw.org.uk/ XP1800+ Page added, Graphics Tutorial
WIMBORNE http://www.wessex-astro.org.uk/ Wessex Astro Society's Website
Dorset UK Info, Meeting Dates, Sites & Maps

 

[Eeyore]

Jamie wrote:

Eeyore wrote:
John Fields wrote:

Pay no attention to the Donkey troll.

One of his favorite tricks is to try to derail a discussion by
focusing on irrelevant minutiae


Pieter is the one discussing irrelevancies such as the non-existent RC oscillator
in a standard 8051.

The OP made it clear he's talking about a crystal/resonator based clock oscilaltor
not an RC type.

Please THINK !

practice what you post!

Coming from YOU, that's hilarious.

Graham

 

[Paul Luggar]

Still looking!

--



Paul Luggar

M0SCI

Website WWW.M0SCI.CO.UK

Amsat-UK Member 6484

www.m0sci.co.uk/forum Devon and Cornwalls Amateur Radio Message Board

m0sci@gb7cow.#44.gbr.eu
"Paul Luggar" <luggsey@hotmail.com> wrote in message
news:f4n65s$lbo$1$8300dec7@news.demon.co.uk...

I need one to repair my preamp, I can't get one anywhere unless I have
3000!
NEC3SK299 is a drop in replacement I think.
Anybody help?
I will pay all costs to obtain one or possible 2 or three!
Cheers.


--



Paul Luggar

M0SCI

Website WWW.M0SCI.CO.UK

Amsat-UK Member 6484

www.m0sci.co.uk/forum Devon and Cornwalls Amateur Radio Message Board

 

[Jerry Avins]

Yes Baby wrote:

"Donald" <Donald@dontdoithere.com> wrote in message
news:F6adnYZQyp-cJi7bnZ2dnUVZ_oLinZ2d@comcast.com...
tdr911turbo@gmail.com wrote:
Windows XP tips and tricks. Learn how to bypass very common windows
problems, to speed up your system and make it more reliable with
useful tips and tricks.

http://windowsxpsp2pro.blxxspot.com

Whats with all this blogspot crap ??!!

Is this the new SPAM ??

Why is it that only gmail addresses post about blogspot ??!!

donald

most spam is now gmail origin and as said by others Google don't give a
google.

Here's the response you'll get:

"Thank you for your note. Google does not regularly monitor or censor
postings sent to Google Groups, but we do try to prevent wide-scale spam
and other forms of Usenet abuse. Please be assured that the information
you sent to us is being collected and taken into account. While we
understand how annoying off-topic posts can be, we aren't able to pursue
most complaints we receive about them. We are using the information you
provide to make large-scale improvements in preventing abuse. We
appreciate your help in our efforts to increase the quality of Google
Groups.

"Replies to this email address will not be received. If you have a
general Google Groups question or wish to report a post that you suspect
is illegal, please visit our Help Center at
http://groups.google.com/support

"Regards,
The Google Team"

Jerry
--
Engineering is the art of making what you want from things you can get.
ÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻÂŻ

 

[John Fields]

On Thu, 01 Nov 2007 02:21:58 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

John Fields wrote:

Pay no attention to the Donkey troll.

One of his favorite tricks is to try to derail a discussion by
focusing on irrelevant minutiae

Pieter is the one discussing irrelevancies such as the non-existent RC oscillator
in a standard 8051.

---
On the contrary, he made it very clear that he knew there's no
internal RC oscillator in an 8051:

" I wrote that it does NOT have an internal crystal, like most other
parts. But the 8051 also has no internal RC oscillator. It needs
external parts."

when you earlier implied that he thought there was an internal RC
oscillator in an 8051.
---

The OP made it clear he's talking about a crystal/resonator based clock oscilaltor
not an RC type.

Please THINK !

---
Why bother when there's hardly a need to when dealing with you?


--
JF

 

[clicliclic@freenet.de]

Lostgallifreyan schrieb:

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote in
news:i5jmh3dqsu079tbnja7vbuc0kcd4n7i517@4ax.com:

I had a look at the offer, and the above are my thoughts. Can't spot
anything obviously dodgy here.

Martin (who owes you a reply).

That's my impression too-- a seller who likely has dubious English
skills, and almost surely doesn't really understand what he is selling
(It's not uncommon for eBay sellers to get stuff by auctions or
whatever that they don't really understand). Of course that increases
the risk that you'll get something other than what you think.. I'd be
a lot more confident if there was a photo, but the first two
conclusions would remain.

Note also that he appears to have tried to sell the bulk of his stock
to you outside of eBay. While not unusual, it's not really kosher.

To summarize- I don't think it's a scam either, just a German guy
trying to make a few spare EURs.


Sounds about right. He still won't respond though, he doesn't seem to want
to sell them to me. Odd for someone who a few days ago wanted me to buy
3000.

I'll have to leave it, if I bid he can charge me a million bucks for
postage if he wants. He can certainly hike it up massively if he thinks
the bidding was too low. And he can force a formal dispute and leave me bad
feedback if he wants when I refuse to pay excess. Traps should not be
walked into, it doesn't matter if they were intentionally laid or not.

On the German eBay page

<http://cgi.ebay.de/Optocoupler-H11F1-D7C-9934-250-
Stueck_W0QQitemZ170158848446QQihZ007QQcategoryZ12949QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>

the (national) postage is given as Euro 10.00 (this excludes
insurance). This is a bit on the high side, but within reason.

On October 20, the seller added the remarks "Keine Garantie oder
Gewährleistung" (no warranty) and "Kein Rückgaberecht" (no right of
return). These are probably a reaction to queries, but they are no
unusual conditions either.

Martin.

 

[Tim Wescott]

Joerg wrote:

Tim Wescott wrote:
Joerg wrote:
Hello All,

After some problems a client saw I was treated to my own dose of what
is likely flash loss: The uC in our mailbox door has become erratic.
I installed it about three months ago and half of the day it receives
a good pelting from the sun. First it began not recognizing some
keys, then it started doing weird stuff like lock cycling. Things it
wasn't meant to ever do. Batteries, contacts and such look ok, reset
didn't help, so that's not it.

TI has an app note about the topic:
http://focus.ti.com/lit/an/slaa392/slaa392.pdf

Figure 1 looks scary above the 80C range. Later they presented
another test with a different bake cycle which makes things look
better but who knows.

What is you experience with respect to flash errors on uC that are
exposed to elevated temperatures as most outdoors applications are?

One of my clients makes products that regularly go above 80C, and that
has never been an issue to my knowledge (all the service guys I used
to hang with have either left or been promoted, so I don't have that
immediate knowledge one gets by being service's life line). Certainly
the to-do if it were recognized would have bubbled down to me.


Well, in my case it kind of has bubbled down to me now ;-)


OTOH, all the parts are very carefully selected to work over the
industrial temperature range; if your mailbox thingie is designed with
commercial temp range parts all bets are off (and it may be something
else that's happening, too).


It's not just this mailbox but also some MSP430 apps at a client. They
predate my involvement there and we are pretty much stuck with that for
a while. We are seeing a distinct pattern where those inside smaller
boxes fail more often than those in larger and more airy enclosures.
This stuff is used in the south where summers are quite toasty.

Have you tried cooking them on purpose? Even if you don't have a "real"

environmental chamber, you can do a lot with an insulated box and a heat
gun (including catching the lab on fire (ask me how I know!), but that
usually entertains the technicians).

I'd toss some in an oven for an extended high-temperature test, to see
where they failed.

I'd also check the heat rise against ambient in both small and large
enclosures.

If they get any solar load, I'd throw up my hands and call a mechanical
engineer who's good with thermodynamics, but that's just because I
(usually) know where my competence ends.

Some of the flash parts that I have seen used to success have been from
TI, but they aren't TMS430s, and they _are_ industrial temperature range
parts.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

 

[Jamie]

Tim Wescott wrote:

Joerg wrote:

Tim Wescott wrote:

Joerg wrote:

Hello All,

After some problems a client saw I was treated to my own dose of
what is likely flash loss: The uC in our mailbox door has become
erratic. I installed it about three months ago and half of the day
it receives a good pelting from the sun. First it began not
recognizing some keys, then it started doing weird stuff like lock
cycling. Things it wasn't meant to ever do. Batteries, contacts and
such look ok, reset didn't help, so that's not it.

TI has an app note about the topic:
http://focus.ti.com/lit/an/slaa392/slaa392.pdf

Figure 1 looks scary above the 80C range. Later they presented
another test with a different bake cycle which makes things look
better but who knows.

What is you experience with respect to flash errors on uC that are
exposed to elevated temperatures as most outdoors applications are?

One of my clients makes products that regularly go above 80C, and
that has never been an issue to my knowledge (all the service guys I
used to hang with have either left or been promoted, so I don't have
that immediate knowledge one gets by being service's life line).
Certainly the to-do if it were recognized would have bubbled down to me.


Well, in my case it kind of has bubbled down to me now ;-)


OTOH, all the parts are very carefully selected to work over the
industrial temperature range; if your mailbox thingie is designed
with commercial temp range parts all bets are off (and it may be
something else that's happening, too).


It's not just this mailbox but also some MSP430 apps at a client. They
predate my involvement there and we are pretty much stuck with that
for a while. We are seeing a distinct pattern where those inside
smaller boxes fail more often than those in larger and more airy
enclosures. This stuff is used in the south where summers are quite
toasty.

Have you tried cooking them on purpose? Even if you don't have a "real"
environmental chamber, you can do a lot with an insulated box and a heat
gun (including catching the lab on fire (ask me how I know!), but that
usually entertains the technicians).

I'd toss some in an oven for an extended high-temperature test, to see
where they failed.

I'd also check the heat rise against ambient in both small and large
enclosures.

If they get any solar load, I'd throw up my hands and call a mechanical
engineer who's good with thermodynamics, but that's just because I
(usually) know where my competence ends.

Some of the flash parts that I have seen used to success have been from
TI, but they aren't TMS430s, and they _are_ industrial temperature range
parts.

I have found strong R.F. and EMF's in close proximity have caused the

flash to get corrupted in PIC's. I'm sure it effects others.



http://webpages.charter.net/jamie_5"

 

[Joerg]

Tim Wescott wrote:

Joerg wrote:
Tim Wescott wrote:
Joerg wrote:
Hello All,

After some problems a client saw I was treated to my own dose of
what is likely flash loss: The uC in our mailbox door has become
erratic. I installed it about three months ago and half of the day
it receives a good pelting from the sun. First it began not
recognizing some keys, then it started doing weird stuff like lock
cycling. Things it wasn't meant to ever do. Batteries, contacts and
such look ok, reset didn't help, so that's not it.

TI has an app note about the topic:
http://focus.ti.com/lit/an/slaa392/slaa392.pdf

Figure 1 looks scary above the 80C range. Later they presented
another test with a different bake cycle which makes things look
better but who knows.

What is you experience with respect to flash errors on uC that are
exposed to elevated temperatures as most outdoors applications are?

One of my clients makes products that regularly go above 80C, and
that has never been an issue to my knowledge (all the service guys I
used to hang with have either left or been promoted, so I don't have
that immediate knowledge one gets by being service's life line).
Certainly the to-do if it were recognized would have bubbled down to me.


Well, in my case it kind of has bubbled down to me now ;-)


OTOH, all the parts are very carefully selected to work over the
industrial temperature range; if your mailbox thingie is designed
with commercial temp range parts all bets are off (and it may be
something else that's happening, too).


It's not just this mailbox but also some MSP430 apps at a client. They
predate my involvement there and we are pretty much stuck with that
for a while. We are seeing a distinct pattern where those inside
smaller boxes fail more often than those in larger and more airy
enclosures. This stuff is used in the south where summers are quite
toasty.

Have you tried cooking them on purpose? Even if you don't have a "real"
environmental chamber, you can do a lot with an insulated box and a heat
gun (including catching the lab on fire (ask me how I know!), but that
usually entertains the technicians).

That I haven't tried yet. A friend of mine (chemical engineer) did
something similar. After an extended hospital stay he casually mentioned
that his lab was now a black hole and that the door was gone.

I'd toss some in an oven for an extended high-temperature test, to see
where they failed.

I'd also check the heat rise against ambient in both small and large
enclosures.

That's what I suggested to the client, to place some USB temp loggers in
there.

If they get any solar load, I'd throw up my hands and call a mechanical
engineer who's good with thermodynamics, but that's just because I
(usually) know where my competence ends.

Some of the flash parts that I have seen used to success have been from
TI, but they aren't TMS430s, and they _are_ industrial temperature range
parts.

I wish the MSP430 was available in automotive but it ain't. At least not
according to the TI rep.

One could add some code so it re-flashes itself once in a while, that's
another option here. However, the device cannot lose power during that
brief period or it'll be really toast. So that would require large
enough electrolytics and some pre-regulator voltage monitoring. The
latter would require a relayout, bigger ECO and all that. Not a VP of
Engineering's favorite path, usually.

--
Regards, Joerg

http://www.analogconsultants.com/

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[Joerg]

Jamie wrote:

Tim Wescott wrote:

Joerg wrote:

Tim Wescott wrote:

Joerg wrote:

Hello All,

After some problems a client saw I was treated to my own dose of
what is likely flash loss: The uC in our mailbox door has become
erratic. I installed it about three months ago and half of the day
it receives a good pelting from the sun. First it began not
recognizing some keys, then it started doing weird stuff like lock
cycling. Things it wasn't meant to ever do. Batteries, contacts and
such look ok, reset didn't help, so that's not it.

TI has an app note about the topic:
http://focus.ti.com/lit/an/slaa392/slaa392.pdf

Figure 1 looks scary above the 80C range. Later they presented
another test with a different bake cycle which makes things look
better but who knows.

What is you experience with respect to flash errors on uC that are
exposed to elevated temperatures as most outdoors applications are?

One of my clients makes products that regularly go above 80C, and
that has never been an issue to my knowledge (all the service guys I
used to hang with have either left or been promoted, so I don't have
that immediate knowledge one gets by being service's life line).
Certainly the to-do if it were recognized would have bubbled down to
me.


Well, in my case it kind of has bubbled down to me now ;-)


OTOH, all the parts are very carefully selected to work over the
industrial temperature range; if your mailbox thingie is designed
with commercial temp range parts all bets are off (and it may be
something else that's happening, too).


It's not just this mailbox but also some MSP430 apps at a client.
They predate my involvement there and we are pretty much stuck with
that for a while. We are seeing a distinct pattern where those inside
smaller boxes fail more often than those in larger and more airy
enclosures. This stuff is used in the south where summers are quite
toasty.

Have you tried cooking them on purpose? Even if you don't have a
"real" environmental chamber, you can do a lot with an insulated box
and a heat gun (including catching the lab on fire (ask me how I
know!), but that usually entertains the technicians).

I'd toss some in an oven for an extended high-temperature test, to see
where they failed.

I'd also check the heat rise against ambient in both small and large
enclosures.

If they get any solar load, I'd throw up my hands and call a
mechanical engineer who's good with thermodynamics, but that's just
because I (usually) know where my competence ends.

Some of the flash parts that I have seen used to success have been
from TI, but they aren't TMS430s, and they _are_ industrial
temperature range parts.

I have found strong R.F. and EMF's in close proximity have caused the
flash to get corrupted in PIC's. I'm sure it effects others.

What do you mean by strong? VHF radio close by? Cell phone? If yes, do
you remember how close?

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.