audio recording on IC -help wanted

Electronic TC7116ACKW datasheet
more similar IC model ,like this
TC7116 TC7116 TC7116A TC7116A TC7116ACKW TC7116ACLW TC7116ACLW
TC7116ACPL
Features
* Low Temperature Drift Internal Reference
- TC7116/TC7117 80 ppm/ĄĆC Typ.
- TC7116A/TC7117A 20 ppm/ĄĆC Typ.
* Display Hold Function
* Directly Drives LCD or LED Display
* Zero Reading with Zero Input
* Low Noise for Stable Display
- 2V or 200mV Full Scale Range (FSR)
* Auto-Zero Cycle Eliminates Need for Zero
* Adjustment Potentiometer
* True Polarity Indication for Precision Null
Applications
* Convenient 9V Battery Operation:(TC7116/TC7116A)
* High Impedance CMOS Differential Inputs: 1012§Ů
* Low Power Operation: 10mW
Applications* Thermometry
* Bridge Readouts: Strain Gauges, Load Cells,Null Detectors
* Digital Meters: Voltage/Current/Ohms/Power, pH
* Digital Scales, Process Monitors
* Portable Instrumentation
General Description
The TC7116A/TC7117A are 3-1/2 digit CMOS analogto-digital
converter(ADCs) containing all the active components necessary to
construct a 0.05% resolution measurement system. Seven-segment
decoders, polarity and digit drivers, voltage reference, and clock
circuit are integrated on-chip. The TC7116A drives liquid crystal
displays (LCDs) and includes a backplane driver. The TC7117A drives
common anode light emitting diode (LED) displays directly with an 8mA
drive current per segment.

more detail from http://www.chinaicmart.com/series-TC7/TC7116ACKW.html
 
On Thu, 24 Apr 2008 23:53:51 +0100, Chris S <default@default.invalid>
wrote:



So it's specialised. I guess that will teach me not to strip
components out of other equipment!
Not neccessarily. If you have an application for an arc suppressor, in
the future, then you've got one, and the start of the basic knowledge,
now, to recognize the situation and to possibly use the one you've
got.

Mind you, these do have a limited application life ie number of arcing
events and must be kept scrupulously clean, to continue to function as
intended. Something to keep in mind.

RL
 
Visit the link below:
http://www.dpbolvw.net/click-2863058-10437698

To get Relaxed Visit the link:
http://anujbatta.blogspot.com
 
There are 2 basic approaches.

One is to sense current flowing through the line.

The other, probably easier, is to sense the voltage across it. This will be
well above 30 volts when the line is not in use, well below that when it is
in use.

Your sensing circuit needs a very high input impedance (like 10 or 20
megohms) to avoid putting a measurable load on the line.
 
<snip>

Yes we are using a full bridge at this power level because that is how the
design was originally made.
The MOSFETs used in the original design are hard to get (long lead time)
and
I'm looking for suitable replacements.

Is there anything wrong with using full bridge for lower power levels with
high voltage?

Well, you can cut complexity and many other factors in half simply by
converting to a half bridge, for a start, ( particularly if the output
voltage is appreciably lower than the input - which I suspect is the
case ).

Reverse recovery problems and leakage energy recovery can be
simplified or avoided entirely by using a two-transistor forward ( or
even two-transistor flyback ) converter.

Justification for the original design is really more in order here,
particularly if it's producing problems that seem to require redesign,
now.

RL
I'd love nothing more than to chnage the design (design is the fun stage)
but this is one of those fire that poped up and they want a replacement
component pronto. The FET in question is an APT1003RKLLG. nonstock te
digikey and all microsemi parts are on do not design in status due to
delivery problems.
 
copy other design is illegal.. pls stop your copy.


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"legg" <legg@nospam.magma.ca> wrote in message
news:v8451452lfeokqks2fmcb2t2u1domu1jnl@4ax.com...
On Fri, 25 Apr 2008 16:58:27 -0500, "Mook Johnson" <mook@mook.net
wrote:



I'd love nothing more than to chnage the design (design is the fun stage)
but this is one of those fire that poped up and they want a replacement
component pronto. The FET in question is an APT1003RKLLG. nonstock te
digikey and all microsemi parts are on do not design in status due to
delivery problems.


The original part was 500nS/3.2uC

Placing external antiparallel diodes may not be effective without
series drain diodes to stop parasitic diodes from functioning. I'm
surprised that you are running into this problem at such low current
levels.... should be a few hundred milliamps.....unless you're really
flogging the mag current.

It may not be such a big deal converting a full bridge to a half
bridge or two-transistor forward - its possible that the foil patern
would not have to change - just the magnetics and parts stuffed in
present locations.

Full bridge to half bridge - replace one side of the bridge with film
capacitors, halve the primary turns and lay off current mode in favor
of voltage mode. You can still use current mode influence for ripple
and transient rejection. A little goes a long way. Same 'reverse
recovery' in the fets, though.

Full bridge to two-transistor forward. Replace one phase of fets
(opposite quadrants) with ultrafast rectifiers, reroute secondary
center-tap to antiphase end of secondary, increase secondary rectifier
voltages, and output choke inductance increases by ~3. Reverse
recovery is all in real rectifiers. The old control circuit will limit
switching duty cycle to <50%

RL

Thanks,

I'll look into it but I'm pretty sure the changes are more than "they" want.
:(

I was hoping to find some that were slightly better thant the APT parts for
reverse recovery but it seams like ~400nS is about as good as it gets.
The design dies work with the APT parts but I was looking for some gains in
noise and efficiency by selecting better mosfets that originally designed
in.

Oh well.
 
"Green Xenon [Radium]" wrote ...
"Richard Crowley" wrote :
"Green Xenon [Radium]" wrote ...
Anyways, my next question. Is it possible to split the symbol of a
1
baud, 8-bit-per-symbol signal
into 8 bits? I.e. in this case, a single
symbol would be split into 8 different
parts each carrying one of the
bits. Is this possible? If so, would
this be of any assistance to me?

Sure it is possible. It won't be of any assistance to you (or to
anyone else since you can't put 8 pounds in a 1-pound sack.
Bandwidth is bandwidth, no matter how you slice it. Do you
really think that nobody has thought of various methods of
transmitting video over low-bandwidth paths? If so, you need
to study not only science and engineering but the HISTORY
of science and engineering.

There are 8-bits-per-symbol, only 1 baud. The symbol is split into 8
parts. Each part is 1-bit.

How is this “putting 8 pounds in a 1-pound sack?”

It’s more like “putting 1 pound in a 1-pound sack”
Which weighs more: one 8-pound sack, or eight 1-pound sacks?
Yes, it is a trick question, but you are the master of trick questions.
 
Howdy all,
I am trying to track down a replacement for a transistor(?) with
the following #'s:

D829 (K)
6J2

Try adding '2S' to the front of that part number. Japanese
semiconductor manufacturers have omitted it form small plastic packages
(and some others) for over 30 years.

2SD829 is the base part number, the '(K)' is the beta group, and
'6J2' is the date or batch code.
Perhaps it's this one?

http://www.datasheets.org.uk/pdf/3937549.pdf

If so, it's a fairly hefty NPN Darlington switch.

--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
 
Ray King wrote:

I guess if one can believe that gold plated wires can change the
characteristics of an electrical carrying conductor enough that it can be
detected at an audio frequency,
You would have to have some kind of audio-religious belief to do that since it
has no basis whatever in science/physics/materials properties. I would totally
disregard anyone who made any such specious claim.


then, I guess that person can tell the difference between silicon and
germanium
That would be quite different. For a host of possible related reasons.

Graham
 
lewiseason@ googlemail.com wrote:
Thanks guys, this has been very helpful
(and I now see how complex this will be (normally)).
Lewis
How to post to Usenet:

1) Don't start a new thread every time you post.
Don't start a new thread
to comment about another thread you started.
Do comment in the original thread.
http://groups.google.com/groups/search?enc_author=IjoOxBkAAABaTN_kDd6TnHkoIcBWtp3cHTOmbQnqfgSRzFxCoznfCw&scoring=d

2) Have something specific in the body of the post
that indicates WTF you are talking about.

3) Put something on the Subject line
that indicates WTF you are talking about.

http://groups-beta.google.com/support/bin/answer.py?answer=46492
 
Tim Wescott wrote:
On Tue, 29 Apr 2008 18:31:08 +0000, Joerg wrote:

Hello Folks,

Is there any model, research results etc. for RF transformers that
feature extreme turns ratios such 100:1 and more? I am mainly interested
in leakage inductance, bandwidth and such. Bandwidth doesn't have to be
more than an octave, single digit MHz range. It just can't be resonant,
at least not a lot.

I know this is a far stretch but maybe ...

A bandwidth of around an octave implies _some_ resonance.
On extreme ratios you just can't avoid it.


You'll have a huge juggling job between leakage inductance and primary
inductance.
Yes, and you can never have half turns like at some restaurants.


The more loss you can stand the better chance you'll have of making it
work. I'd feel a strong sense of accomplishment if I got 50% of my input
power coming out of my secondary.

I recall reading in some ARRL publication or another (the one on
transmission line transformers, I think) that to achieve extreme ratios
you can often do better using two stages -- in your case perhaps three?
4:1 * 5:1 * 5:1 = 100:1.
Unfortunately that won't work in this case. It's usually only ok if you
have an active stage inbetween.


Disclaimer: never done it, I wasn't there, it's not my fault, etc.
Maybe you could come visit at the hospital if it blows up in my face ;-)

--
Regards, Joerg

http://www.analogconsultants.com/

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

Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in
news:eOaXi.670$lH1.196@newsfe06.lga:


mahak wrote:


hi all,
can someone plz tell wat are punch through devices and wat is their
switchin speed and on state resistance


I don't know about the switching speeds, You'd have to
check the spec's on them, But I use some nice diodes
that clamp very fast due to their design. TVS diodes is
one trade name they go by among others.
They make great replacements where circuits are using
zeners for protection. These units will react much faster
of course than a zener diode.

Look for TVS "Transient Voltage Suppresser" diodes.
the ones I use are punch through devices.. ..
You should be able to find some paper on it.





I'm looking into those now on Google. Best find so far is this:
http://www.eettaiwan.com/ARTICLES/2001JUN/2001JUN14_AMD_AN2001.PDF?SOURCES=
DOWNLOAD
(beware wordwrap in that URL)

While I go on with this, there's one question I'm hoping I can get answered
faster here: Are TVS's enough like zener diodes that they can be used as
simple voltage regulators in the same way, but with the additional fast
surge suppression advantages that TVS's are intended for?

A secondary question, related to that: If they are useful as regulators, do
they also exist like zeners, with forward voltages as low as a volt or
less, so they can give crowbar protection against reverse polarity, in
conjunction with a fast fuse, something a standard zener is useful for?
I've never used one for regulating but I can tell you that they respond
faster than a normal zener diode due the less capacitance and I don't
think the curve response is the same.

The main differences are the current handling and response time.


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
 
John Larkin wrote:
On Sun, 21 Sep 2008 16:44:40 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Hello Folks,

Looking for a staunch chip to drive transformers in the 30-150kHz range.
The most powerful (and available) one I found is the MIC4451 but it's
1ohm Rdson. Way too much.

There are bigger ones but they usually have a charge pump and the
efficiency is pretty poor when operated at less than 3A:
http://rocky.digikey.com/weblib/Infineon/Web%20Data/TDA21201prelimDS.pdf

What I need is n/p channel push-pull output (not two n-channels), no
charge pump because the clock sometimes stops, and ideally 100-200mohm
Rdson. External FETs aren't so hot, too much cross conduction. I was
hoping there'd be n/p synchronous buck converters. But nope, all with
charge pumps.

Any ideas?


This is a nice part:

http://www.national.com/pf/LM/LMD18201.html

It has a charge pump, but it also has an oscillator to keep it pumped
even when the input parks at one level for a long time. I've used it
for driving microsteppers, works fine.
Thanks, John. I had looked at that one and the Rdson is a bit highish,
600mohm max. I've also had some issues with National motor drivers with
obsolescence. Thing is, a lot of my stuff remains in production well
over 10 years.

I wish there was a big brother of the LMD18201 somewhere, 1/3rd of its
Rdson or so. I am running this at 12V supply and cost is not a real
concern for this part of the design. IOW if it was $10 a pop it would be ok.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
 
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
"Floyd L. Davidson" wrote:

Ross Herbert <rherber1@bigpond.net.au> wrote:
floyd@apaflo.com (Floyd L. Davidson) wrote:
:Ross Herbert <rherber1@bigpond.net.au> wrote:
:
:> voice frequency circuits were all 300 - 3400Hz in my day.
:
:The PSTN is specified from 400 to 2800 Hz, with 24 dB SNR.
:
:Individual channels on various carrier systems, and some
:private line voice circuits are specified with more
:bandwidth.

In Australia PSTN is specified for 300 - 3400 Hz bandwidth.

I doubt it.

You're just plain wrong about everything.
Which would be easy to prove if it were true, but you
can't. Therefore it seems I am certainly quite correct!

"Most of the current telephone systems are still restricted to the historically
motivated limitation of the bandwidth from 0.3 to 3.4 kHz."
http://portal.acm.org/citation.cfm?id=1142855&dl=&coll=
Do you have any idea what they are talking about?
(Indeed, do they?) They mention the *maximum* bandwidth
for a single PCM carrier channel, and of course if you
link multiple channels together, and put a 5 mile cable
pair on either end... you *can't* get that bandwidth.

Which is exactly why the PSTN has a minimum bandwidth
specification of 400-2800 Hz.

http://advancingphysics.iop.org/previous/wb/teacher/BandwidthW6.pdf
That says exactly *nothing* about bandwidth
specifications for the PSTN. Did you even read it?

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@apaflo.com
 
On May 1, 12:32 pm, Tom Bruhns <k7...@msn.com> wrote:
On May 1, 11:57 am, "amdx" <a...@knology.net> wrote:



"Joerg" <notthisjoerg...@removethispacbell.net> wrote in message

news:CV0Sj.981$To6.131@newssvr21.news.prodigy.net...

Tim Wescott wrote:
On Tue, 29 Apr 2008 18:31:08 +0000, Joerg wrote:

Hello Folks,

Is there any model, research results etc. for RF transformers that
feature extreme turns ratios such 100:1 and more? I am mainly interested
in leakage inductance, bandwidth and such. Bandwidth doesn't have to be
more than an octave, single digit MHz range. It just can't be resonant,
at least not a lot.

I know this is a far stretch but maybe ...

A bandwidth of around an octave implies _some_ resonance.

On extreme ratios you just can't avoid it.

You'll have a huge juggling job between leakage inductance and primary
inductance.

Yes, and you can never have half turns like at some restaurants.

Please give some more information about why you can never have half turns.
I remember
overheating a transformer that used a half turn. Never tried half turns
again. But what is the reason the half turn gets hot?
Mike

With a toroid core, it should be obvious why you can have only
integral numbers of turns. In an E-I core, or a pot core with
openings on both sides, you can have a wire exit a different place
than it entered. The loop then closes around one of the outside
"legs" of the core. Note that this is equivalent to a full number of
turns around the center post, and one turn around the outer post, with
the two connected in series. IF the magnetics are balanced, the field
in the outer leg will be half the field in the center leg. But this
happens only if there is no current in the turn around the outer leg.
Note that the "half turn" is not strongly coupled to the rest of the
turns, and as a result adds a lot of leakage inductance. I don't see
why the "half" turn itself should get hot, but if it diverts the
magnetic field into the other leg in such a way that it significantly
increases the core loss in that leg, it could lead to excess power
loss in the transformer.

Cheers,
Tom
Which got me to thinking: you can keep the magnetics in the two outer
legs balanced (that is, the rate of change of flux per unit time) if
you put a turn around each and put those two turns in parallel.
However, each will see half the flux that's in the center leg, so will
contribute half a turn's voltage...this could be an interesting way to
get a high step-up ratio with fewer secondary turns: only 50 turns
instead of 100, to get a 1:100. That could be an advantage in keeping
the parasitic capacitance on the secondary at bay, though the
effective capacitance is generally a very weak function of the actual
number of turns--and for modest permeability cores, significantly
lowers the pri:sec coupling as compared with having the windings co-
axial.
 
Tom Bruhns wrote:

With a toroid core, it should be obvious why you can have only
integral numbers of turns. In an E-I core, or a pot core with
openings on both sides, you can have a wire exit a different place
than it entered. The loop then closes around one of the outside
"legs" of the core. Note that this is equivalent to a full number of
turns around the center post, and one turn around the outer post, with
the two connected in series. IF the magnetics are balanced, the field
in the outer leg will be half the field in the center leg. But this
happens only if there is no current in the turn around the outer leg.
Note that the "half turn" is not strongly coupled to the rest of the
turns, and as a result adds a lot of leakage inductance. I don't see
why the "half" turn itself should get hot, but if it diverts the
magnetic field into the other leg in such a way that it significantly
increases the core loss in that leg, it could lead to excess power
loss in the transformer.
Here is a patent on the subject:
http://www.freepatentsonline.com/6348848.html


--
Regards,

John Popelish
 
Tom Bruhns wrote:
On May 1, 12:32 pm, Tom Bruhns <k7...@msn.com> wrote:

On May 1, 11:57 am, "amdx" <a...@knology.net> wrote:




"Joerg" <notthisjoerg...@removethispacbell.net> wrote in message

news:CV0Sj.981$To6.131@newssvr21.news.prodigy.net...

Tim Wescott wrote:

On Tue, 29 Apr 2008 18:31:08 +0000, Joerg wrote:

Hello Folks,

Is there any model, research results etc. for RF transformers that
feature extreme turns ratios such 100:1 and more? I am mainly interested
in leakage inductance, bandwidth and such. Bandwidth doesn't have to be
more than an octave, single digit MHz range. It just can't be resonant,
at least not a lot.

I know this is a far stretch but maybe ...

A bandwidth of around an octave implies _some_ resonance.

On extreme ratios you just can't avoid it.

You'll have a huge juggling job between leakage inductance and primary
inductance.

Yes, and you can never have half turns like at some restaurants.

Please give some more information about why you can never have half turns.
I remember
overheating a transformer that used a half turn. Never tried half turns
again. But what is the reason the half turn gets hot?
Mike

With a toroid core, it should be obvious why you can have only
integral numbers of turns. In an E-I core, or a pot core with
openings on both sides, you can have a wire exit a different place
than it entered. The loop then closes around one of the outside
"legs" of the core. Note that this is equivalent to a full number of
turns around the center post, and one turn around the outer post, with
the two connected in series. IF the magnetics are balanced, the field
in the outer leg will be half the field in the center leg. But this
happens only if there is no current in the turn around the outer leg.
Note that the "half turn" is not strongly coupled to the rest of the
turns, and as a result adds a lot of leakage inductance. I don't see
why the "half" turn itself should get hot, but if it diverts the
magnetic field into the other leg in such a way that it significantly
increases the core loss in that leg, it could lead to excess power
loss in the transformer.

Cheers,
Tom


Which got me to thinking: you can keep the magnetics in the two outer
legs balanced (that is, the rate of change of flux per unit time) if
you put a turn around each and put those two turns in parallel.
However, each will see half the flux that's in the center leg, so will
contribute half a turn's voltage...this could be an interesting way to
get a high step-up ratio with fewer secondary turns: only 50 turns
instead of 100, to get a 1:100. That could be an advantage in keeping
the parasitic capacitance on the secondary at bay, though the
effective capacitance is generally a very weak function of the actual
number of turns--and for modest permeability cores, significantly
lowers the pri:sec coupling as compared with having the windings co-
axial.
there is a pretty picture of exactly that in Keith Billings SMPS book.

in some cases the leakage can be exploited.

I have a humungous iron powder core with 8.5 turns on it. its an
inductor, so I dont care about the leakage.

Cheers
Terry
 
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Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns998EAA8D3B45zoodlewurdle@140.99.99.130:

LONG post alert. >:) Might be instructive though, or at least, amusing.

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&strHpK
e yword=Manual&text=Printer%20%3E%20Manual&cat=printers

http://www.jpcparts.com/page/category_hp.asp?strHpCategory=printer&str
H 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.
I just tried one of these strange outfits that say they have, or can get
parts. First one I tried for the part in question, and sure enough, it
really IS that bad! Read on if you're bored enough.....


Hi, I saw this on your site:
Caritronics K-3000 TRANSFORMER PLY HV 3000VDC FS $87.00
Can you tell me any specs for it? 3000VDC is nice but how much current? I'd
need to know before deciding on anything.
Any info at all is welcome.

Hello!



I have received your request for a quote. I am working on getting your
prices but in the meantime I would love to have you set up in our
system. Can you please email me the following information:



Name

Company name

Address



Phone

Fax



Thank you!



[Company details omitted, this is a fun post, not investigative journalism]



Creating Business Excellence Through Customer Communication
No, you don't need any of that. If you have the part, AND information to
help me choose, I might be able to decide to buy. If you ask me for
information that doesn't help me find the part or information about it, I
won't go there, it's a waste of time, and a potential annoyance.

I am working on your quote and waiting for the additional information
you requested. I just figured we could save time by putting your
information in the system already. As soon as I receive the information
I am waiting on, I will send your quote through email.
If you're able to get info on that part, just reply by mail as you already
did, that's all you need. None of that other stuff is needed, no-one buys
parts that way, they just buy parts. IF the information about them is
forthcoming without obstacles, otherwise they go elsewhere.

I can quote you the price on the part K3000 to be $1763.00. If you are
interested in me sending you a formal quote please let me know.
Awesome! I found a couple for less than $50 including postage. I knew you
weren't for real, and you just confirmed it MAGNIFICENTLY. What kind of
outfit are you, really?
You don't have the parts, do you, or even any access to them at all? You
don't know a thing about them, do you? They don't weigh 3 lb each either,
so you might want to correct that little detail on your site.
Let me guess, you're one of these middlemen outfits who try to profit by
inserting themselves between people and the things they are looking for, a
bounty hunter for stupid people who don't really know what they want and
have far too much of other people's money to spend. I'd have the same
change trying to buy this part from a Nigerian email scammer, I imagine.

-------------------------------------------------

Ok, maybe not all of them are like that but this should be a warning not to
go to people like that, they'll slap you silly if you're daft enough to let
them think you really want something from them.
 

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