audio recording on IC -help wanted

[Paul]

On Jan 15, 2:37 pm, Paul <energymo...@gmail.com> wrote:

On Jan 15, 2:26 pm, Clifford Heath <n...@spam.please.net> wrote:

Paul wrote:
Anyhow, what kind of circuit are they using in this AM-240?  It
appears as if it *resists* change!

It's almost certainly a bootstrapped input amplifier, with the
bootstrap gain slightly over unity.

Clifford Heath.

Thanks Clifford!  I think you nailed it.  Anyhow, this is a first for
me, and a pleasant surprise to learn of this.

I have no affiliation with Amprobe, but as far as inexpensive ($40)
DMM's go, this one seems like a gem. I was going to take it back today
at Frys Electronics for the PM51A because it claims 1Gohm impedance,
while the AM-240 only says > 100Mohms. Hmmm, 14G is far greater than
100M, lol. I'll keep it.

Paul

BTW, here's a bootstrapped input amp circuit -->

http://web.telia.com/~u43200663/blocks/bootstrapping.htm

Thanks Clifford.

Paul

 

[Andre Majorel]

Manufacturers tend not to give a figure for the number of
insertions their DIN connectors can take. I've never seen one
fail but those don't tend to be the type you plug/unplug ten
times a day. Does anyone have data or experience with that ?

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
"Buy in bulk, that's my advice." -- Lemmy

 

[Richard Crowley]

"Dave Platt" wrote ...

No. No. And, no. You cannot possibly do this... for several reasons.

For one thing, trying to convey 300 bits of information per symbol is
still grossly optimistic. If you take a look at real-world modulation
systems (QAM64 and so forth) you'll find that they send much less
information per symbol... I don't have the best numbers available off
of the top of my head, but I'd be surprised if there's a system in
practical use which tries to send more than 16 bits per symbol. The
amount of noise on real-world communcation channels makes it
impractical-to-impossible to go much beyond that... and you are
proposing something *far* beyond that. Trust me - the laws of physics
in this universe won't permit you to do it.

Perhaps "Radium" should ask his questions over there in
that other universe where *his* laws of physics apply.

 

[Jan Panteltje]

On a sunny day (13 Nov 2007 18:15:58 -0500) it happened DJ Delorie
<dj@delorie.com> wrote in <xn3av991ox.fsf@delorie.com>:

"Phil Allison" <philallison@tpg.com.au> writes:
** You poor, downtrodden people who live in technically underdeveloped
places....

I can literally walk out of my front door and up the street for about 200
metres to a component's dealer who will sell me 2SK369s $1.20 Australian
each.

You poor, downtrodden people who live in such crowded locations. I
can literally walk out my front door and go about 200 meters, and
still only be halfway down my driveway. ;-)

I can walk out my frontdoor, go 3 kilometer, and from there it is water until the northern
arctic ice.
Transistors are the other way.

 

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[DH1]

Hello,

I would like to set up a low power transmitter/receiver pair to
wirelessly send low rate data through a car dashboard, about 1byte
sent once a second. The receiver above the dashboard will be powered
by two AA batteries with 3500mAh total capacity and should last for at
least 1 yr => <400uA average drain total, however I would like to
achieve <100uA average drain if possible (power is also required for
the Rx uC circuit).

If the Tx/Rx pair operate for less than 10ms every second then the
average current drain during operation can be as high as 10mA (for
100uA total average) etc. The Tx and Rx devices require relatively
fast power up/down times, ideally less than 2ms each. The receiver
will operate continuously until it locks on to the Tx cycle and will
then only operate to cover the Tx time segments (a low power clock/uC
circuit will control the Tx & Rx).

The range is obviously very low, about 1m maximu.

Can anyone suggest a low cost low power solution ?

Thank you,

DH

 

[WKW]

I need a source for a few Maxim max6008 2.5 V precision shunt voltage
references or an equivalent unit that will work down to a few uA of
current.

 

[Michael Black]

"doug" (doug.morsit@virgin.net) writes:

"Bo-Lennart" <bo-lennart.karlsson@telia.com> wrote in message
news:a33a23b4-9601-4639-975c-290392eb6c66@j44g2000hsj.googlegroups.com...
Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!


Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

But why do you think that? Merely because it was a popular voltmeter IC

does not mean it's what is used. Fluke is a big enough test equipment
manufacturer that it seems likely that it is worth their while to use
custom ICs. Let's not forget that the Intersil IC is thirty years old,
and is merely a voltmeter IC. It takes a fair amount of external circuitry
to make it into an actual DMM, and when making a lot of DMMs it's usually
worth getting as much integration as possible. What was ground breaking
in '77 or '78 isn't groundbreaking 30 years later.

I've never opened one of those $9.95 DMMs with wired in test leads and flat
as possible but I doubt they would use a voltmeter IC that requires a bunch
of other ICs to get a complete set of functions. And if they can get it
all into a blob of epoxy, there's even less reason for Fluke to use
multiple ICs.

That said, your suggestion isn't completely bad. Because again, it's
always worth putting in some time before trying to track down an expensive
and hard to get IC. So the original poster can go through known voltmeter
ICs, and see if there is any common ground between the "sample circuit"
in the datasheets and the actual meter. A quick glance will say one way
or another, it's when there is a match on some analog component (since
those are few they are an easy way to check) that more work is required,
because then one has to see if the premise actually goes all the way.

Michael

 

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[Eeyore]

Scott Seidman wrote:

Scott Seidman <namdiesttocs@mindspring.com> wrote
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

The step size on encoders is even worse !

The step size on encoders is 1. What you do to it after you collect it
is your business. If you multiply it by 2, then its 2. If you divide
it by 100, its 0.01. My point is that for an input device in a
digital system, resolution doesn't have to be a factor.

For example, I'm not sure any of my scopes have any mechanical pots on them
anymore.

Quite possibly but you don't mix on them do you ?

Graham

 

hi,

I bought an Analog MEMS accelerometer (http://www.analog.com/en/prod/
0%2C2877%2CADXL193%2C00.html) and I'd like to be able to put in on a
breadboard for prototyping purposes. Does anyone know what kind of
socket is suitable and where I can get it? The pin configuration is a
bit unusual: 3 on each long side and 1 on each short side.

thanks,
Jon.

 

[Donald Ennis]

I'm looking for operating perameters and characteristec curves for this
pentode. I have a bunch of these and want to test the output and possibly
the transconductance.

Thanks,
d.

 

[Bob Woodward]

lizhiren@hotmail.com wrote:

Wonder Electronic Technology Co. Ltd is a spammer !!!

And Google Groups makes it possible.

Since Google provides access to newsgroups, all kind of
morons who didn't know of the existence of newsgroups
before come in and try to sell their cigarettes, sex-
photos and pcb's.

Please Google,.... STOP GOOGLE GROUPS

<1189739409.389512.102770@y42g2000hsy.googlegroups.com>

Bob

 

[Jolly Roger]

On 2007-09-24 09:55:20 -0500, Gary Tait <classicsat@yahoo.com> said:

videogamesgamesgames@yahoo.com wrote in news:1190494326.731042.166180
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Help improve usenet. Kill-file Google Groups:
http://improve-usenet.org/

JR

 

[Graham]

"Jim" <nomail@riomail.com> wrote in message
news:Xns99526A09F520B5D4AM2@127.0.0.1...

I am in the UK.

Can I build a simple device which would switch a pair of contacts on/off
when my landline phone was being used.

Am thinking of something like this. There might be a simple reed switch
(do such things still exist) which would close its contacts if there was
a current on the phone line.

Perhaps I might need to improve the situation and wind the landline (or
maybe just one of the two wires) around the reed switch.

Would something like this work?

Or can I buy a simple plug-in device for something like a fiver which
closes its contacts when the phone line is active?

As Sue suggests go for a voltage sensor solution rather than
a current one. On-hook a phone line has about 48v across
the wires, Off hook it falls to about 9v so anything below
(say) 20v can be assumed to be off-hook.

You might want to seek out a line interface that has the
necessary approvals, especially if you are working on
somebody else's line.
--

Graham.
%Profound_observation%

 

[John Fields]

On Sat, 2 Feb 2008 17:02:19 -0800 (PST), bill.sloman@ieee.org wrote:

On Feb 2, 9:28 pm, John Fields <jfie...@austininstruments.com> wrote:
On Sat, 2 Feb 2008 10:33:19 -0800 (PST), bill.slo...@ieee.org wrote:
The "mess" is the fact that English spelling reflects six indepedents
sets of rules relating the phonemes we hear and produce and the
alphabetic characters that we use to represent them. Noah Webster
switched the spelling of a few words from one set of rules to another,
further complicating an already complicated situation, by
institionalising two different sets of spellings for what is - in fact
- a single language.

---
Really?

http://www.krysstal.com/ukandusa.html

And what do you expect your readers to learn from that web-site?

---
That English isn't, pure-and-simple, a single language. Ever since
we left England, American and British English have been evolving in
different ways, what with the independent addition and deletion of
new words, idioms, and grammatical constructs on both sides of the
pond.

Taken one step further, Australian English is different from both
American and British English and I suspect each language will
continue to evolve as the needs/wants of its users change over time.
---

Actually, he made it simpler for us by more closely paralleling the
spelling we read with the phonemes we "hear" when we read.  

Like I said, English spellings are derived from one of six different
sets of rules for doing that. Noah Webster just switched the spelling
of a lmited number of words from one set of rules to another.

---
Fine, and by so doing he left us with a pronunciation guide for some
words which clearly minimizes ambiguities and simplifies the
spelling of those words. In my book, simplification is a good
thing. I suspect that in your book it would also be a good thing
had not some American come up with it.
---

This doesn't represent a significant or particularly useful simplification.
Serious spelling reform would involve fixing on one set of rules and
using that set without exception

---
At the expense of ridding the language of its delicious subtleties
for the sake of homogeneity?
---

Whether he made it simpler for you is of little concern since you
have your precious traditions and habits and, good or bad, you're
certainly not going to break them for any American "yokel" who shows
you a better way.
---

Noah Webster's changes aren't "better" in any practical sense -
Americans don't learn to read or write better or faster than English
speakers in other countries who use the traditional spellings.

---
Now, now, Bill...

Even you shouldn't have a problem with realizing that it takes
longer to type 'colour' than it does to type 'color'.

Quantitatively, if we say it takes an extra 100 milliseconds to type
the unnecessary 'u' and that 'colour' is typed a few million times a
day, we wind up with a waste of time of over 8300 hours per day just
for 'color'. Add in the rest of the words containing the
unnecessary 'u' and the waste of time...

Well, you get the point, yes?
---

I'm not aware that Noah Webster coined any new words, and I wouldn't
care if he did - all languages coin new words all the time, and lose
old ones. Dictionaries try to keep up, but not even the complete
Oxford expects to incorporate every new word as it is coined. Many of
the new words don't last and there is little point in incorporating
them in a dictionary.

---
Yes, but that's all rather well known and banal, so why bother with
an unnecessary "exposition"?
---

You introduced the subject of new words

---
Nope, I introduced the fact that Webster's content is different from
the OED's and that if you were interested in learning the nuances of
American English you would do well to buy a copy of it. [Webster's]

Matter of fact, it was you who introduced the subject of new words
with your calumny of Webster and Americans in general:


"You should keep in mind that Noah Webster couldn't spell all that
well

http://en.wikipedia.org/wiki/Noah_Webster

which he covered by claiming that his errors were more "American"
than the correct spellings. Your ancestors bought the story and you
have been spelling like yokels ever since."
---

which strikes me as totally
irrelevant to Noah Webster's contribution (such as it was) - and your
suggestion that the OED might be "frozen" did imply that you needed an
exposition of this well known and banal aspect of language.

---
So you missed that it was rhetorical question?

Why am I not surprised?
---

On top of that, I'm sure there are words in Australian English which
are peculiar to that language and aren't part of the OED.

Should they not have been coined as well?
---

Dictionaries reflect the language - and should include those new words
that end up being used by appreciable numbers of people. This has
nothing to do with Noah Webster's half-baked ventures into spelling
reform, which had the incidental - but surely not unwelcome - effect
of protecting his market from U.K.-based competition.

---
Well, the way I read it was not spelling reform for the sake of
quelling competition, but spelling corrected to be concomitant with
pronounciation.

Since there are six sets of pronounciation rules for written English,
all that Webster was doing was switching from one set of rules to
another - his dictionary still contains examples of words spelled/
pronounced according to all six sets of rules, so his corrections were
partial and arbitrary.

---
His dictionary also contains examples of deprecated and archaic
words no longer in common use. So what?
---

You, of course, always see evil in everyone's intentions but your
own, so the little tale you dreamed up in order to cast Webster in
the light of a charlatan is hardly unexpected.

I didn't claim that he was a charlatan - he only had to be
idiosyncratic and ill-informed to behave as he did and it is possible
that he never noticed that he was freezing out U.K. publishers, though
he seems to have been too much a publisher for that to be all that
likely.

---
Then you deny writing:

"You should keep in mind that Noah Webster couldn't spell all that
well

http://en.wikipedia.org/wiki/Noah_Webster

which he covered by claiming that his errors were more "American"
than the correct spellings."


and:

"- as it is all he did - and
all he probably intended to do - was to make it difficult for U.K.
publishers to sell their dictionaries in the U.S.A." ?

---

My Webster's lists ten different meanings for 'hood', one of which
is: "3. the hinged movable part of an automobile body covering the
engine."

Which seems to nicely allay any confusion, and it seems strange to
me that that meaning, being in popular use for quite some time,
wouldn't be attributed to the word with all the others.

Is the OED frozen?
---

Far from it. There's now a BBC program - "Balderdash and Piffle"

http://www.bbc.co.uk/history/programmes/wordhunt/

where the BBC invites its viewers to help up-date the Oxford
Dictionary of the English Language. Victoria Coren, who presents the
program, managed to include her father - Allan Coren, one-time editor
of Punch - in one of the earlier programs.

It's great fun if you like that sort of thing.

Incidentally, does the Webster's definition work for the Volkswagen
and other rear-engined cars?

---
Of course.

It doesn't work for me.

---
Well, of course it doesn't.  Webster _was_ American, wasn't he?
---

He died in 1843, so it wouldn't have worked for him either.

---
And yet, the salient definition in his dictionary is that of a
hinged automobile engine cover with no restriction as to its
location, so it seems he had _something_ going for him.
---

From an earlier post you must have missed:

" My Webster's lists ten different meanings for 'hood', one of which
is: "3. the hinged movable part of an automobile body covering the
engine.""

Notice that no distinction is made as to the hood's location on the
car.
---

Which means that it doesn't reflect popular usage - at least in the
places I've been.

---
Probably not, if the people in the places you frequent are as
stilted as you are.
---

As far as I'm concerned, they keep their
engine/motor in the trunk/boot and you put your luggage under the hood/
bonnet.

---
Be that as it may, we go with Webster and say that the hood's in
back and the trunk's in front
---

Can you cite an example of somebody using the word "hood" to describe
the engine-cover of a Volkswagen?

---
Of course. Me:  

"The engine of a 1964 Volkswagen Beetle I once owned was under the
hood."

How's that?
---

That's funny - everybody else's 1964 Volkwagen had a boot/trunk under
the hood, because the engine/motor was in the back of the car.

---
Not _everybody_ else. We who use Webster's dictionary call the
engine cover a 'hood' and don't concern ourselves with whether it's
located on the front or the rear of the car.

Since you call an engine cover a 'bonnet' doesn't its location also
follow the engine?
---

I've done a little Googling, and the nearest I've got to something
unambiguous was somebody advertisng a VW "hood emblem" that went on
the front of the Beetle, not the engine cover.

---
Google "Volkswagen hood" for ads and pictures of VW hoods.
---

None of them showed where the hood was supposed to be fitted on the
car, and none of the hoods I saw had the ventilation slots I seem to
remember seeing in the engine covers on the Beetles I knew.

---
Yeah, right!

Here's the first hit I got:

http://www.partstrain.com/ShopByDepartment/Hood/VOLKSWAGEN

Notice the ventilation slots.

The reason they don't show where it's supposed to be fitted on the
car is because they're not selling maintenance manuals, they're
selling parts and, ostensibly, if you buy parts from them you know
where they're supposed to go. YMMV.
---

The OED is scrupulous about that sort of thing.

---
That's curious, since you earlier admitted they don't have a
non-ambiguous definition for the part of a car you call the hood.

They just give - as one particular meaning of the word - a phrase
covering any kind of external protective cowl for any mechanism.

It is non-ambiguous, but not specific.

---
Then you're saying that the OED doesn't exclude a 'bonnet' from
being called a 'hood'

No, it doesn't - according to them both "bonnet" and "hood" can refer
to external protective cowls.

---
So, you've accepted our 'hood' as being interchangeable with your
'bonnet'?

A step in the right direction, I'd say.

--
JF

 

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[Poxy]

Sally wrote:

Without taking sides on any other issues, IMO the old rule not to top
post is out of date! It is much more appropriate in today's
environment to top post.

Ahh. You're one of those people who call being considerate and respectful of
prevailing customs "political correctness" yes?