audio recording on IC -help wanted

[mpm]

On Aug 9, 1:12 am, Adam Smith <adamsm...@nospam.com> wrote:

Hello,

I am designing a system in which I need to generate a timestamp in order
to insert a checksum, an ID, and other metadata to accompanying data
being passed between modules. I have seen and read of recommendations to
use TOY (Time of Year) Chips but I cannot find any specific chip or
Datasheet on any, to accomplish this.

Any recommendation or referral to suitable references would be appreciated.

Thanks!

Start with the Maxim DS1305 or DS1307.
There are many RTC (real time clocks) out there, so I'm not suggesting
this is the best fit for your application.
But, at least it will get you started. I think Epson also makes RTC.
And you can browse Digikey, Mouser, etc.... to find more.

Good luck. -mpm

 

[Jim MacArthur]

Dallas (now Maxim) once dominated the market for real-time clocks:

http://www.maxim-ic.com/design_guides/en/REAL_TIME_CLOCKS_1.pdf

But TI, ST and others are there, too. Search DigiKey, Newark, etc.
for "real time clock".

 

[Nico Coesel]

Adam Smith <adamsmith@nospam.com> wrote:

Hello,

I am designing a system in which I need to generate a timestamp in order
to insert a checksum, an ID, and other metadata to accompanying data
being passed between modules. I have seen and read of recommendations to
use TOY (Time of Year) Chips but I cannot find any specific chip or
Datasheet on any, to accomplish this.

Any recommendation or referral to suitable references would be appreciated.

NXP has many of such chips!

--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
--------------------------------------------------------------

 

[Proteus IIV]

On Jul 12, 1:33 pm, Lostgallifreyan <no-...@nowhere.net> wrote:

http://bursonaudio.com/burson_opamp.htmhttp://www.audioenz.co.nz/forums/archive/index.php/t-5625.html

Don't ask me how I bumped into those while Googling for a few bits of info on
audio op-amps, I just wish I hadn't, and want to spread the pain. >

I HAVE NOT PREVIEWED THE OTHR RESPONSES
BUT
BEST TO DO WITH THOSE IS OPERATE THEM IN A HIGH COOLED ENVIRONMENT
GET THEM OUT OF THAT ROOM
OR CHANGE THE TEMPERATURE IN THEIR PRESENT ENVIRONMENT
SO THAT THEY WILL MAINTAIN CRISP RESONANCE WITHOUT THE HEATING
EFFECTS OF THE LOW HARMONIC WAVEFORM ON THE CATHODES AND MECHANICAL
ENCLOSURE

IAP

 

[Proteus IIV]

SHORT ANSWER

YES !
TOTALLY INSANE TUBE DUDE [;-)]

I AM PROTEUS

 

[Paul Keinanen]

On Sun, 08 Aug 2010 23:12:42 -0700, Adam Smith <adamsmith@nospam.com>
wrote:

Hello,

I am designing a system in which I need to generate a timestamp in order
to insert a checksum, an ID, and other metadata to accompanying data
being passed between modules. I have seen and read of recommendations to
use TOY (Time of Year) Chips but I cannot find any specific chip or
Datasheet on any, to accomplish this.

If you want to generate a unique value from the time stamp, you must
be careful how you got that time stamp.

Local time is clearly out of the question in countries using daylight
saving time, since going back from daylight saving time to normal
time, will cause one hour of duplicate time stamps (I hope I got this
right also for the southern hemisphere .

UTC is in principle better, but it still suffers from the leap second
problem. While in practice all leap seconds have always been added:
Dec 31 23:59:59, 23:59:60, Jan 1 00:00:00 UTC but in principle it is
also possible to have Dec 31 23:59:58, Jan 1 00:00:00 UTC transition,
so depending on the internal representation, there might be duplicate
problems.

A truly linear time scale, such as GPS time is safe.

 

[mpm]

On Aug 9, 1:12 am, Adam Smith <adamsm...@nospam.com> wrote:

Hello,

I am designing a system in which I need to generate a timestamp in order
to insert a checksum, an ID, and other metadata to accompanying data
being passed between modules. I have seen and read of recommendations to
use TOY (Time of Year) Chips but I cannot find any specific chip or
Datasheet on any, to accomplish this.

Any recommendation or referral to suitable references would be appreciated.

Thanks!

Weird - I thought I replied, but it's not showing up.
Did you look at Maxim DS1305 and/or DS1307 yet?
Or search on Digikey, Mouser, etc... for Real Time Clock.

 

[Adam Smith]

Thanks guys for your responses, they were very helpful:
Yes, mpm your post did come through earlier.
And Paul Keinanen, you did raise an interesting perspective which I had
not taken into account.

THANKS! again


On 8/9/2010 12:26 AM, Robert Baer wrote:

Adam Smith wrote:
Hello,

I am designing a system in which I need to generate a timestamp in
order to insert a checksum, an ID, and other metadata to accompanying
data being passed between modules. I have seen and read of
recommendations to use TOY (Time of Year) Chips but I cannot find any
specific chip or Datasheet on any, to accomplish this.

Any recommendation or referral to suitable references would be
appreciated.


Thanks!
Read the PC clock or the rather fast clock in the FPU (ticks since power
on).

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@removethishotmail.com> wrote in
news:4c8493ea$0$8958$c3e8da3@news.astraweb.com:

Spehro Pefhany wrote:
On Thu, 26 Aug 2010 12:33:31 -0500, Lostgallifreyan wrote:
George Herold <gherold@teachspin.com> wrote

What's HPS? High Power... Sodium?

George H.

Almost... high pressure sodium.

A lot less stinky than high pressure selenium.

You've blown a selenium rectifier too ? :-(

Graham

I think he was thinking of rectifying a bit of abberant evolution...
In case you're wondering what all this means, the Truth is Out There. *big
hint*

 

[admiralsmead]

contact the folks at http://www.go-grafx.com located in Kitchener Ontario.
I know they make short run custom labels for asset tags etc.

You can also try http://www.polylabel.com/ also in Kitchener or SETON in Markham Ontario http://www.seton.ca/splash/asset_tags/propid.htm

 

On Jul 17, 3:04 pm, Rich Grise <ri...@example.net.invalid> wrote:

Spehro Pefhany wrote:
On Sun, 17 Jul 2011 09:17:31 -0700 (PDT), the renowned
a7yvm109gf...@netzero.com wrote:

I would like a thin film device of that size, yes. It's for another
one of my experiments. It's all related to my earlier question of
turning a hard drive into a lapping machine.

Why don't you want to sign their EUA?

EAU, my mistake.

Estimated Annual Usage, hey I got it right the first time...

You're thinking End User Agreement?

Yeah, got that on the brain, plus I was allowing for possible swapping
of acronym letters between French and English (eg. HRDC == DRHC).

Well, you can do as John suggests. There are some total a**holes who
will never ever pay for a part who ask for free samples- that's not
you. Isn't there some way this could turn into a product? How
sucessful could that product be?

I've been upfront with vendors, and told them, "Say, what are the chances
you could sample me a couple of these, even though you know it's for a home
project?" and they've sent me parts.

What was it that was wrong with just ordering some? Some kind of import
thing, or minimum order, or some such? Could you find a friendly Yank,
who would just drop ten of them in an envelope?

Thanks,
Rich

The distributors I approached either didn't reply to my email, or only
replied once.
What am I to do!? Thin film Hall sensors aren't easy to buy, it seems.

 

On Mon, 18 Jul 2011 10:46:46 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

Hall sensors make BLDC motors a lot easier to control, at least at a
hobby or small production level. Back-EMF isn't that easy to do over a
wide range of motor speeds, at least the last time I looked at it.

Cheers
Phil Hobbs

There are few complete motor controllers on a chip type products
around. MicroChip parts MTD6501C, MTD6501D,
and MTD6502B for instance. These only require a microcontroller with a
dedicated PWM channel to operate. These make back-emf control of BLDC
motors easier by orders of magnitude. Trying to do it in software is,
as you describe, a total PITA.
Dave

 

[Jamie]

The Ghost In The Machine wrote:

On Sep 14, 1:40 pm, Fred Abse <excretatau...@invalid.invalid> wrote:

On Sun, 11 Sep 2011 20:40:38 -0700, The Ghost In The Machine wrote:


THE HYSTERISIS CURVE IS A CHARACTERISTIC OF A WAVE FORM., NOT INSIDE
THE CORE BUT THE INPUT/OUTPUT SIGNAL.......

Go learn some magnetics theory (if you're capable).

You might learn to spell "Hysteresis" as well.

--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)


MR. ABSCESS, LEARN TO MIND YOUR FUCKING BUSINESS.
BE REAL YOU RODENT, NOBODY LIKES A NOSEY BODY.
TGITM

Why must you use CAPS in all your messages?

Jamie

 

[JW]

On Wed, 14 Sep 2011 20:54:41 -0400 Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in Message id:
<9Sbcq.7073$RC6.3003@newsfe10.iad>:

The Ghost In The Machine wrote:
On Sep 14, 1:40 pm, Fred Abse <excretatau...@invalid.invalid> wrote:

On Sun, 11 Sep 2011 20:40:38 -0700, The Ghost In The Machine wrote:


THE HYSTERISIS CURVE IS A CHARACTERISTIC OF A WAVE FORM., NOT INSIDE
THE CORE BUT THE INPUT/OUTPUT SIGNAL.......

Go learn some magnetics theory (if you're capable).

You might learn to spell "Hysteresis" as well.

--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)


MR. ABSCESS, LEARN TO MIND YOUR FUCKING BUSINESS.
BE REAL YOU RODENT, NOBODY LIKES A NOSEY BODY.
TGITM

Why must you use CAPS in all your messages?

He rests his schlong on the shift key.

 

[The Ghost In The Machine]

On Sep 14, 1:40 pm, Fred Abse <excretatau...@invalid.invalid> wrote:

On Sun, 11 Sep 2011 20:40:38 -0700, The Ghost In The Machine wrote:

THE HYSTERISIS CURVE IS A CHARACTERISTIC OF A WAVE FORM., NOT INSIDE
THE CORE BUT  THE INPUT/OUTPUT SIGNAL.......

Go learn some magnetics theory (if you're capable).

You might learn to spell "Hysteresis" as well.

--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
                                       (Richard Feynman)

PLEASE MR. FLINTSTONE, THIS IS NOT AN ENLIISH GRAMMAR GROUP.
GO TO ALT.ENGLISH.GRAMMAR.FREAKS FOR THAT.
THANK YOU VERY MUCH.
PATECUM
TGITM

BOOWAHAHAHAHAHAHAHAHA !

 

[Jamie]

Glenn wrote:

(Answers are sent to news://sci.electronics.components )

I have been a little curious about the temperature versus stability - so
I compared two datasheets:


Unconditionally stable 0..100mA: Below 6nF - or more than 3uF:
http://www.ti.com/lit/gpn/tl431


Unconditionally stable 0..100mA:
7pF
or
3nF < CL < 25nF
or
0,2uF
http://www.diodes.com/datasheets/TL431_432.pdf

-

What do I find?

(1) That the stability curves (possible capacitance loads) is different
for different suppliers, and

(2) that the stability is only shown for Ta=25 deegree Celsius.


This means:

(1) It is harder to find an unconditionally stable capacitance load
intervals for all suppliers (only 2 datasheets used in comparison).

(2) You do not know if it is stable - or how to make it stable - at e.g.
Ta -40 deegree Celsius


How do you stably use and select __431?

-

How do capacitor ESR and ESL influence stability?

Glenn

That is the difference between Mill spec. and home entertainment
components.

The price also reflects that, too.

P.S.

When designing for critical operations or customers, you normally
fully test each batch and cat it. Also, make previsions in the design
and assemblies to compensate for each unit in the final test.

Jamie

 

[Phil Hobbs]

Glenn wrote:

(Answers are sent to news://sci.electronics.components )

I have been a little curious about the temperature versus stability - so
I compared two datasheets:

Unconditionally stable 0..100mA: Below 6nF - or more than 3uF:
http://www.ti.com/lit/gpn/tl431

Unconditionally stable 0..100mA:
7pF
or
3nF < CL < 25nF
or
0,2uF
http://www.diodes.com/datasheets/TL431_432.pdf

-

What do I find?

(1) That the stability curves (possible capacitance loads) is different
for different suppliers, and

(2) that the stability is only shown for Ta=25 deegree Celsius.

This means:

(1) It is harder to find an unconditionally stable capacitance load
intervals for all suppliers (only 2 datasheets used in comparison).

(2) You do not know if it is stable - or how to make it stable - at e.g.
Ta -40 deegree Celsius

How do you stably use and select __431?

-

How do capacitor ESR and ESL influence stability?

Glenn

That's a good reminder that just because two chips have the same part
number doesn't mean they behave the same way, especially under unusual
conditions.

The TL431 is pretty slow, so ESL shouldn't be a big worry. (You're
going to be using SMT ceramics, I assume.) The simple method is to bomb
it flat with a 10 uF X7R ceramic and not worry about it any more.
(The 431 is a nasty noisy beast anyway, so filtering hard is all to the
good.)

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

 

[BeeJ]

Try contacting Cary Eskow at Avnet LightSpeed.
He seem very knowledgeable on the subject of LEDs.
e-mail Cary at
LightSpeed@Avnet.com

--
So where are we?
Not the street address.
Not the city.
Not the country.
Not the Earth.
Not the Solar System.
Not the Galaxy.
Not the Universe.
Not the Brane.
So where is the Brane?
Where are we?

Life is but a dream!

 

[Glenn]

On 29/04/12 15.14, Phil Hobbs wrote:
....

That's a good reminder that just because two chips have the same part
number doesn't mean they behave the same way, especially under unusual
conditions.

The TL431 is pretty slow, so ESL shouldn't be a big worry. (You're
going to be using SMT ceramics, I assume.) The simple method is to bomb
it flat with a 10 uF X7R ceramic and not worry about it any more.
(The 431 is a nasty noisy beast anyway, so filtering hard is all to the
good.)

Cheers

Phil Hobbs

Thanks for your answers.

I have compared TL431 with some other ballast-regulators, but they do
not have much lower noise?

How low "can" the noise reasonably be?

How low will a "standard" ca.0.4W 9.1V zener diode at 10mA e.g. be for
comparison?

Is this the state of the art ballast-regulators regarding long-term
stability (pretty expensive)? No noise level is given as far as I can read:
LT1019A 5V:
http://search.digikey.com/us/en/products/LT1019ACS8-5%23PBF/LT1019ACS8-5%23PBF-ND/889569
LT1019A 2.5V:
http://search.digikey.com/us/en/products/LT1019ACS8-2.5%23PBF/LT1019ACS8-2.5%23PBF-ND/888648

http://www.linear.com/docs/3834
Quote from datasheet: "...
If output bypassing is desired to reduce high frequency output
impedance, keep in mind that loop phase margin is significantly reduced
for output capacitors between 500pF and 1ÎźF if the capacitor has low ESR
(Effective Series Resistance). This can make the output “ring” with
transient loads. The best transient load response is obtained by
deliberately adding a resistor to increase ESR as shown in Figure 1.
...."

-

I have found this noise cancelling circuit, but it will ruin the voltage
stability:

Finesse Voltage Regulator Noise!:
http://www.wenzel.com/documents/finesse.html

br

Glenn

 

[Phil Hobbs]

Glenn wrote:

On 29/04/12 15.14, Phil Hobbs wrote:
...
That's a good reminder that just because two chips have the same part
number doesn't mean they behave the same way, especially under unusual
conditions.

The TL431 is pretty slow, so ESL shouldn't be a big worry. (You're
going to be using SMT ceramics, I assume.) The simple method is to bomb
it flat with a 10 uF X7R ceramic and not worry about it any more.
(The 431 is a nasty noisy beast anyway, so filtering hard is all to the
good.)

Cheers

Phil Hobbs

Thanks for your answers.

I have compared TL431 with some other ballast-regulators, but they do
not have much lower noise?

How low "can" the noise reasonably be?

How low will a "standard" ca.0.4W 9.1V zener diode at 10mA e.g. be for
comparison?

Is this the state of the art ballast-regulators regarding long-term
stability (pretty expensive)? No noise level is given as far as I can read:
LT1019A 5V:
http://search.digikey.com/us/en/products/LT1019ACS8-5%23PBF/LT1019ACS8-5%23PBF-ND/889569
LT1019A 2.5V:
http://search.digikey.com/us/en/products/LT1019ACS8-2.5%23PBF/LT1019ACS8-2.5%23PBF-ND/888648

http://www.linear.com/docs/3834
Quote from datasheet: "...
If output bypassing is desired to reduce high frequency output
impedance, keep in mind that loop phase margin is significantly reduced
for output capacitors between 500pF and 1ÎźF if the capacitor has low ESR
(Effective Series Resistance). This can make the output “ring” with
transient loads. The best transient load response is obtained by
deliberately adding a resistor to increase ESR as shown in Figure 1.
..."

-

I have found this noise cancelling circuit, but it will ruin the voltage
stability:

Finesse Voltage Regulator Noise!:
http://www.wenzel.com/documents/finesse.html

br

Glenn

If you don't mind spending a bunch of supply current, as in the shunt
post-filter case, you can just use a better voltage reference such as an
LM329, plus an op amp and a transistor. That's what's inside the 431,
except that the reference is a bandgap, and those are always noisy.
They work by adding a diode drop to a scaled version of the deltaV_BE
between two transistors running at different current densities, and to
make it work the scaling has to be about a gain of 10. Thus in round
figures, even a good bandgap is at least 20 dB noisier than a V_BE drop.

There are tricks to getting reference noise down to lower levels, e.g.
charging up a cap to the reference level between measurements and using
a buffered copy of that voltage instead of the jiggly reference. You
still have the scatter between baselines, but that can often be removed
afterwards.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net