audio recording on IC -help wanted

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[Lostgallifreyan]

websurf1@cox.net wrote in news:72dfedce-8258-4174-a000-
30c68847d772@d21g2000prg.googlegroups.com:

On one of my long-ago jobs while in college, I once used a standard
Craftsman screwdriver to tighten a LIVE but loose 480 3-phase
connection.

I survived. But only later did I stop to realize that the plastic was
probably not rated for any kind of voltage, much less anything in that
range. I get nervous just remembering. Methinks God protects
fools....

The plastic might have been enough actually, but I'd have been anxious
about a sudden lowering of resistance in that connection while working it,
if there was much current flowing. It might have melted explosively at you.
I once tried to reconnect a 240V 100A AC line (with no accessible upstream
switch) not realising that immediately downstream there was a full short
circuit caused by an earlier accident. There shouldn't have been, a pair of
100A terminal blocks takes a LOT to melt down and fuse together that badly,
but so it was, and on applying the connection, it swore at me the way only
a high energy short can (people several rooms away heard it shout), and it
sputtered my eyeballs and the skin of my face with a nice copper vapour
deposition that took days to grow out entirely, and itched fiercely most of
the time. For the first tem minutes I was totally flash blinded, and I was
in nervous shock (not electrical, I took care to at least get that right)
for several hours. Had to attend a science project that evening too, that
was no fun, it should have been, but all I wanted was a dark and quiet
place to rest for a while.

And the weirdest thing of all was that I did it TWICE. The nervous shock
set in instantly, I was so confused I pushed the cable in again as if it
would have worked right the second time. You have been warned! The nervous
shock alone will scramble your system so badly you'll do something wrong
again before you react sanely enough to start doing the right thing. I was
lucky enough to remain on my feet, on a chair I was standing on without
falling against the wall or worse, and had no permanent injury, but I think
fate gives us single warnings on stuff like that. We have to heed them.

 

[Sjouke Burry]

larwe wrote:

Ideas? These used to be available as surplus EVERYWHERE when they were
used in Apple and PC joysticks - a simple 2-axis stick with 10k linear
taper pots on each axis, and a threaded handle. Typically the
mechanism was a black cube with the pots mounted on two edges, and
four screw holes in the top.

I need a few of these for a little art project, but I can't find them
at my usual vendors (Jameco, MPJA, All Electronics, Alltronics,
Electronic Goldmine, et al). I've found old 15-pin PC analog joysticks
at places like geeks.com, but it's not obvious from the photos if
these will do for my purpose, since they don't look like the old Apple
joysticks.

I actually want to use these as gimbals, not as pots - I will remove
the pot and drive the shaft with a servo to aim the stick.

http://www.conrad.nl/goto.php?artikel=425679

or go to
www.conrad.nl, and input joystick in the searchbox.

 

[tony sayer]

In article <Xns9A1E7C30CE4FCzoodlewurdle@140.99.99.130>, Lostgallifreyan
<no-one@nowhere.net> scribeth thus

websurf1@cox.net wrote in news:72dfedce-8258-4174-a000-
30c68847d772@d21g2000prg.googlegroups.com:

On one of my long-ago jobs while in college, I once used a standard
Craftsman screwdriver to tighten a LIVE but loose 480 3-phase
connection.

I survived. But only later did I stop to realize that the plastic was
probably not rated for any kind of voltage, much less anything in that
range. I get nervous just remembering. Methinks God protects
fools....


The plastic might have been enough actually, but I'd have been anxious
about a sudden lowering of resistance in that connection while working it,
if there was much current flowing. It might have melted explosively at you.
I once tried to reconnect a 240V 100A AC line (with no accessible upstream
switch) not realising that immediately downstream there was a full short
circuit caused by an earlier accident. There shouldn't have been, a pair of
100A terminal blocks takes a LOT to melt down and fuse together that badly,
but so it was, and on applying the connection, it swore at me the way only
a high energy short can (people several rooms away heard it shout), and it
sputtered my eyeballs and the skin of my face with a nice copper vapour
deposition that took days to grow out entirely, and itched fiercely most of
the time. For the first tem minutes I was totally flash blinded, and I was
in nervous shock (not electrical, I took care to at least get that right)
for several hours. Had to attend a science project that evening too, that
was no fun, it should have been, but all I wanted was a dark and quiet
place to rest for a while.

And the weirdest thing of all was that I did it TWICE. The nervous shock
set in instantly, I was so confused I pushed the cable in again as if it
would have worked right the second time. You have been warned! The nervous
shock alone will scramble your system so badly you'll do something wrong
again before you react sanely enough to start doing the right thing. I was
lucky enough to remain on my feet, on a chair I was standing on without
falling against the wall or worse, and had no permanent injury, but I think
fate gives us single warnings on stuff like that. We have to heed them.

You were very lucky you didn't get a belt from it as well ..I had one
many years ago when I couldn't let go, and it was fortunate that someone
was nearby who did notice and realise what was going on..

I still remember every microsecond of it, the pain was excruciating I
couldn't move anything just this loud humming and my body violently
shaking(
--
Tony Sayer

 

[MooseFET]

On Jan 6, 3:35 pm, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:

ChairmanOfTheBored wrote:
Use a hard anodized sink. That is a non-conductive interface.

On TO-18 ?

You're quite mad. So, it'll dissipate about 1W now !

It can be done. It is only a 90 degree rise from the case to the
outside of the TO-18. If the ambient is room temperature and the heat
sink is infinite and the transfer is a good heat pipe, it would be
just fine.

On the other hand, you could use the plastic packaged one in a heat
sink and do a little better.

I am really glad that I don't believe him about designing stuff for
the military. I'd rather he worked for the enemy.

 

[mark krawczuk]

hi , no u dont pay the money each time to use their tuning hardware ,
cause u already have to buy the tuning hardware at a cost of $1000 !!! then
u have to pay the 280 $


"Gary Tait" <classicsat@yahoo.com> wrote in message
news:Xns996B89864D64Bwonkynillmailnil@142.77.1.194...

"mark krawczuk" <krawczuk65@dodo.com.au> wrote in
news:468d7055$0$36722$c30e37c6@lon-reader.news.telstra.net:

at $280 for each board , i think not .
the whole setup to tune your car about $1400 plus , u buy the
equipment , u do the tuning and u still have to spend $280 EACH time
u want to tune a car , EVEN THOUGH u OWN the tuning hardware.
mark k


Its called software licensing. Their terms are you pay them $280 per car
to
use their tuning hardware. The PAL is just there to protect their right to
that $280 per car.

 

[robb]

"ajcrm125" <ajcrm125@gmail.com> wrote in message
news:2c9c1ffd-297e-4b0c-89c7-63224cdec825@l1g2000hsa.googlegroups.com...

I'm troubleshooting a Body Control Module (BCM) out of a 2003
Dodge
Minivan and am noticing that all of the components (aside from
the
microcontroller) have no datasheets to be found anywhere on the
web.
Not even on their manufacturers' websites. Is it that these
IC's were
re-labeled specifically for use by Chrysler and that their
equivalents
are for sale to the public under another part number?
These aren't asics or anything by any means; op amps, voltage
regulators, hi-side solid state relays etc. Simple stuff. And
their
part #'s all end in "AA. Weird.....

Without datasheets I don't see how I'm going to be able to work
on
this thing....

hi ajcrm25
i have just been through a similar experience locating datasheets
on ?phantom? ICs.
mine for vintage equipment that was no longer supported by oem.

i do not know the firsthand truth but i can tel you my
experience/observation with locating phantom IC datasheets.

I tried searches and even contacting the original chip maker
(OCM) about non-existing datasheets.

when i found a sincerely helful individual at an OCM and they
received the details of the IC numbers, pics, and name of
equipment the IC was in ..... they would usually reply "sorry, i
have no info on that chip" or "your best bet is to contact the
device maker" which sounds unbelievable as they manufactured the
IC (?? confidentiality speak ??)

So it seems there are several possbilities with the phantom IC
chips...

Very large companies who place very large chip orders can get
their chips custom made, altered and branded in whatever fashion
they desire. Sometimes there is a partial IC number relation to
an existing IC usually for the more common ICs (eg. opamps, volt
regulators, etc ) and then no correlation in other instances.
try partial number matches on datasheet search engines (for
M7101AA -> M71 or 710)

as already mention by other post, The big companies do not want
the mere mortals mucking around their equiment and they do not
want competitors having an easy time understanding their
equipment, and probably alot of other reasons so there is a
purposeful hiding of info.

to add further difficulty to the search , there seems to be a
special IC chip classification just for Automotive use similar to
the classification for milspec devices where even common ICs are
built in a fashion to withstand harsh environments/treatment this
also may include jumbling the pins around to accomodate the
changes to meet the behavior and environamental specifications
made by the chip buyer

so AA might be Automotive Application ? because there are extreme
vibration, temperature and electrical exposures that may require
a more robust IC

Example - one chip i needed (a 40 pin display driver) had a
milspec equivalent where the #s were similar (eg. 75510 vs
755500) but i found out that the milspec chip had all the same
pins and the same functional decription **BUT** all the pins
(except Vcc, Vref) were jumbled and in completely different
places. Both the chips were made by TI.

so, if you really want to dive into the BCM then you may need to
do reverse / investigation ?

scope and trace out the pins, is it connected to any known ICs
and then give a guess as to the function (?opamp,comparator. reg
etc ?) then look up some genric version of that chip, compare pin
outs to your mapping etc so forth and so on until your are
reasonably sure of what the chip is and does.


if you are replacing any components you may not find common
replacements with the same electrical characteristics and
temperature tolerances,

any ways HTH and hope this rambling did not put you to sleep,
robb

 

[Mike Harrison]

On Mon, 22 Sep 2008 12:24:43 GMT, Ross Herbert <rherber1@bigpond.net.au> wrote:

On Fri, 19 Sep 2008 12:58:05 +0100, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:

:
:
:Ross Herbert wrote:
:
:> Eeyore wrote:
:
:> :CPC may be cheaper but may be lower grade parts.
:
:> Are you sure???
:
:> If a CPC part number is identical to the other Farnell company part then both
:> parts will be from the same source I would imagine.
:
:I've never come across that situation. It is a FACT that CPC stock lower grade
:'consumer' parts whereas Farnell stock more 'professional' parts.

Example..?
Doubt there is any difference in Farnell's Multicomp range and similar items from CPC except maybe
packaging. CPC like putting things in seperate bags, like RS.

I've had stuff fromFarnell which came in CPC pre-packs.
It is also not uncommon to find exactly the same part at CPC cheaper than Farnell, both branded and
own-brand (Multicomp)

 

[Jamie]

Eeyore wrote:

Jamie wrote:


Eeyore wrote:

Pieter wrote:


Check the decoupling capacitors.

I'd love to know how he's going to CHECK capacitors ! You certainly say some
daft things.

He might REPLACE any supply decoupling caps that are electrolytic types for
sure. Age is likely to have taken their toll on them.

Oh, I see it's ok now to use the phrase "Decoupling cap"
you back pedaling turd.


A decoupling cap is the correct name for caps used across the power supply. The
output cap of an amplifier is another matter entirely you jumped-up stupid jerk.

Graham

You fringing turd. Just as I suspected. You back pedaling idiot.

You don't know the difference between shit and shanghola.


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[MrThermister]

Hi, I am looking for working examples of the RA53 NTC thermistor -
made by STC/GEC in the UK. It was a favourite means of stabilizing
Wein bridge oscillators. The RA53 was encapsulated in a glass tube
about 25mm long by 2mm in diameter, with two leads and a resistance of
about 5kOhms at RT. It is now sadly obsolete. Am based in the UK,
but willing to deal worldwide. Please respond to
ra53@majik.demon.co.uk or to this group. Thanks and regards,
MrThermister.

 

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[Archimedes' Lever]

On Tue, 31 Jul 2007 12:54:26 +0100, Alex Coleman <no@no-email.com> wrote:

To charge only one cell, can I put a resistor in the place of the
second cell as a sort of dummy cell? If so then what values might I
use?

Take a cell, and measure its internal resistance when fully charged and
when ready to avalanche over to "deadness".

 

[MooseFET]

On Jan 6, 11:44 am, John Popelish <jpopel...@rica.net> wrote:

Eeyore wrote:
The data I have does not support your assertion.

The thermal resistance of the TO-18 package from junction to case is
146C/W whereas for TO-92 it is 83C/W. Will post these in abse.

Thanks. I stand corrected.

Figuring out a way to hold the entire surface of the TO-92
at 25C is a bit of a problem, though. Submersion in boiling
refrigerant, perhaps (i.e. putting the transistor in the wet
end of a heat pipe). Simpler to get effective thermal
contact between a round can and a metal heat sink.

That isn't as easy as it sounds. The TO-18 is strong against
compression at the ends but not in the middle. When you attempt to
grip it, you tend to get a gap around the waist. Using a softish
alloy and making the sink have a slit in it that a screw tightened
seemed to make the best results.

The same sort of thing can be done with the TO-92 but the machining is
a bit trickier. You want the sink to press against the flat face so a
simple round hole and a slit doesn't work very well.

These days it is better to just use a bigger part.

 

Chris Tarrant - 10/March/1999

Certainty level: 25%

This one might be aimed at me, or it might be tinged with a whiff of intent, although I only give one chance in four for Tarrant's thoughts being aimed
at me when he said this. During his "Who wants to be a Millionaire" TV show in March 1999, he said;

if you're watching the show jumping up and down screaming at the telly,
remember you could be here. You can either seek professional help or call us...

The background is as follows. In early March I'd sent a quantity of emails to Capital FM, the London radio station where Mr Tarrant has his breakfast
show. They were addressed to the email account which Mr Tarrant used to read emails posted on Capital's website. Capital objected to the quantity
of emails - in fact, they contacted the Metropolitan Police's Computer Crime unit, who, in turn, "felt my collar" by giving me a verbal warning
over the phone to cease this behaviour.

The emails contained the words which I had heard Mr Tarrant speak in early 1994, namely;

"You know this bloke? He says we're trying to kill him.
We should be done for attempted manslaughter".

At the time of writing (May 1999), the Police have not told me what aspect of the emails was "illegal", nor despite my repeated urging have they
questioned Mr Tarrant about his remarks from 1994.

Regarding the clip from Tarrant's show above. The Police spoke to me on the afternoon of Wednesday 10 March 1999. Tarrant's live show went out
that same evening. The Police have told me that after speaking to me they told Capital FM that they'd spoken to me regarding the emails. So Tarrant
would have known by the time of the show who'd sent the emails and why.... and it's quite possible that his remarks about "seeking professional help"
were aimed at me personally following my attempts to persuade him to own up to his 1994 remarks.

352


--
Posted via NewsDemon.com - Premium Uncensored Newsgroup Service
------->>>>>>http://www.NewsDemon.com<<<<<<------
Unlimited Access, Anonymous Accounts, Uncensored Broadband Access

 

[Michael A. Terrell]

phil-news-nospam@ipal.net wrote:

Tell that to the cable guy. They always tighten those things to the extreme.
Maybe that's a good thing outside. But I've had to use big wrenches to get
them off after the cable guy leaves. Maybe they think its a means to keep
me from using a pirate box?

Another field you don't know anything about, Phil. I worked as the
engineer for a major MSO years ago. I was responsible for all the
electronics in CATV systems scattered all over the US. You are a ham
radio operator, and should be familiar with CFR 47. There are a lot of
regulations in there concerning CATV equipment & installations. CATV
systems share some frequencies with airports and commercial airliners.

It is required by the FCC. The cable company is responsible for any
RF radiation from their system, from their antennas, to every TV they
provide their service to. Most commercial grade 'F' connectors had a
specification of 1/8 to 1/6 turn after finger tight to meet the
radiation & ingression specification. If they detect leakage they have
to find the source. If it is from inside your house and you either
aren't home or won't let them in, they are required to disconnect your
service until all repairs are made.

--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Rafael Deliano]

Any speech chips appreciated.

Best results for me: lurking at
ebay.com Electronic Components and/or Vintage Computing
with keywords like "Speech" and/or partnumber.
Only in very tough cases like Digitalker scanning the
www with google got better results.

Currently available at ebay:
General Instruments SP1000 ( LPC-lattice Analyzer, Syntesizer )
Interstate ASA16 ( filterbank for recognition )
General Instruments SP0250 ( LPC-lattice Synth. )
General Instruments SP0256AL2 ( LPC-lattice Synth. with Phonem. )
Votrax SC01A ( Formant Synth. with Phonem. )
I can scan datasheets and other documentation for
most of these oldtimers.

CTS256-AL2 , SP0256-AL2
Have been at ebay in the last year, but expensive.

And even if they had been cheaper: the SP0256-AL2
with its PWM-output had always a lousy quality compared
to Votrax.
The CTS256 probably implements the Naval Research Algorithm [1]
on a PIC7041 microcontroller.
For anyone using the SP0256-AL2 directly there has been an
Application Note containing precoded a list of common words [2].

MfG JRD

[1] Elovitz et Al. "Automatic Translation of English Text to Phonetics
by mean of letter to sound rules" United States Naval Research
Laboratory Report 7948 year: 1976
( don´ t have it, but would be interestred )
[2] Janet May "Allophone Speech Syntesis Technique" General Instruments
1982
( can scan it )

 

[Martin Griffith]

On Tue, 23 Sep 2008 20:43:33 +0100, in sci.electronics.design Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

Martin Griffith wrote:

Eeyore wrote:
Martin Griffith wrote:
Eeyore wrote:

Do you know how much good audio transformers cost ! I like Lundahls but you get such a
little thing for so much money. Say $80 ea. The client has indicated btw that cost is a
major factor so it might be back to 5532/4s (good enough - the rest of the desk is stuffed
with them) and a discrete front end.

Check out that 2SA1083/4/5 btw. www.profusionplc.com has them in stock (they can be
tricky to get hold of) and a link to the data sheet.

Have you tried the zero Z transformer method?
Thats when you load the Tr with a VE, and have the mix R's on the
input side?
I've got Ted Fletchers VE cct somewhere, but never tried it

Transformers are not even remotely plausible for budget reasons. Why would you want one > anyway
?

It was only an idea. Ted's cct uses a single opamp as a balanced mix (
no transformer, that was not really apparent in my previous post)

Ah ! No balanced bus available here, although there is a 0V sense line.

Graham
Yep, you just loose 6dB signal level, but get exceptional cmrr that

way, with a diff amp, I'll try and find Ted's circuit if you are
interested.

martin

 

[ChairmanOfTheBored]

On Sun, 06 Jan 2008 08:46:10 -0500, Fred Bloggs <nospam@nospam.com>
wrote:

ChairmanOfTheBored wrote:
On Sun, 06 Jan 2008 11:13:35 +0000, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:



ChairmanOfTheBored wrote:


Eeyore wrote:

Lostgallifreyan wrote:

Eeyore wrote


How metal conducts is only relevant when a heatsink is fitted.
Since shiny metal radiates heat less effectively than matt black
plastic it's not hard to see how plastic can outperform metal can
here. There is also the lead frame to consider. A plastic device
has the die mounted directly onto a lead frame which then conducts
heat away from the die into the pcb. Metal can devices do not have
an equivalent direct conduction path.

When I pointed out the radiation aspect, John Popelish pointed out
that it is a small part, not significant, and when the Popelfish has
translated things electronical, I tend to listen. You're right about
the second part though, compared to the copper tab formed as a single
part with one of the leads, the thermal conductivity between can and
wires is lower. I doubt it's that much lower though.

2N2222 Pd = 500mW (metal)
PN2222 Pd = 625 mW (plastic)

It's not exactly an order of magnitude, is it? If the thermal resistance
between can and chip were that much greater, I think the Pd difference
would also be greater than that.

No it's not that much but it is the precise reverse of what the resident
FOOL claimed.

Graham

Funny, how the only part that was acceptable in our mil spec designs
was the metal can variety.

Must have something to do with MTBF.

Very likely so and its ability to withstand adverse environments most likely
because of the hermetic packaging. Irrelevant to anything other than military /
aerospace application and the like of course.


"and the like"? You're an idiot. The metal housed device is better for
more reasons than the hermetically sealed package, idiot.

It has a much broader range of operation.

I am betting that the epoxy package peters out far sooner in designs
where the transistor's capacities are pushed.


Whom is laughing at whom now?

I'm laughing at your pathetic attempt to wriggle out of your error by changing
the topic.


You're an idiot. It is still the same topic. It is still a better
part.

IIRC, the collector is internally connected to the metal housing and the
maximum operating Tj is increased from 125-150oC to an easy 200oC with
the TO-39. Then there is the premium hermetic sealing advantage. There's
no question about the superiority of that package to all else....

If I had tried to incorporate the plastic package into the Geiger
counters we made for the Navy to look at their reactor vessel containment
areas with, we would have lost that contract, and I would have lost my
job. Since our product (The 1.5kV HV source for the counter) was fully
encapsulated, it had to be done with the right parts. Just breathing
"coffee breath" onto some assemblies can cause a premature failure.

 

[Joerg]

John Larkin wrote:

On Tue, 04 Mar 2008 09:05:14 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

John Larkin recently pointed out the NE3508 and NE3509. They are really
nice, steep Vgs versus Id and so on. Even better than the BF862 except
for one major obstacle: At >>50c they are way out of league for many
designs. High drool factor, followed by a depressed look at the BOM budget.

Question: Are there similar hotrod JFETs that are in the 10-20c range?

The BF862 is a rusty old tractor compared to the NEC hj parts. The
hjfets have roughly 10 times the transconductance and 10 times less
capacitance than the jfet, which is a 100:1 gain-bandwidth advantage.
The Rds-on ratio is, like, 20:1.

Also, in my experience, the hj fets are much more repeatable than
jfets. The Idss of the 862 is spec'd at 10-25 mA, which is actually
good for a jfet. Spec-sheet ranges of Idss are 10:1 for some jfets!

In my business, fast time-domain stuff, we don't use jfets. Their
poorly specified dc characteristics, and their low gain, make them
pretty much useless, especially since I can buy 1.8 GHz opamps and 10
GHz mmics nowadays.

I was thinking more about oscillators that must work with really low
supply voltage, a few hundred millivolts. The high gain of the NEC parts
is really beneficial there while the speed would have to be muffled big
time so they remain stable. Pricing is a serious problem though.

--
Regards, Joerg

http://www.analogconsultants.com/

 

[Joerg]

Ok, took a printer (Brother MFC-7820N) apart because it fell silent,
found all voltages to be there, all crystal oscillators humming, but the
DRAM is never accessed. Big fat uC on there, says "Concordia Japan" and
the P/N is LJ9899001. No logo. The web shows the usual collection of
Asian sources but the datasheet links are always dry.

What company is that? I only know a Concordia university.

I am suspecting a reset because the POR/BOR has always been weak. This
doesn't surprise me anymore these days but my last ditch effort before
the printer goes lalaland would be to roach on my own reset circuit
(that has revived many electronic devices in the past).

--
Regards, Joerg

http://www.analogconsultants.com/

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