audio recording on IC -help wanted

G911T74T G911T73T G911T73U G911T74B G911T74D G911T74U G911T75B
G911T75D G911T75T download http://www.chinaicmart.com/series-G91/G911T74T.html
Features
Dropout voltage typically 0.8V @ IO = 400mA/250mA+
Output current in excess of 400mA / 250mA+
Output voltage accuracy +2%
Quiescent current, typically 0.6mA
Internal short circuit current limit
Internal over temperature protection
General Description
The G910/G911 positive 3.3V voltage regulator features the ability to
source 400mA/ 250mA+ of output current with a dropout voltage of
typically 0.8V. A low quiescent current is provided. The typical
quiescent current is 0.6mA.
[+ For ľTO-92 & TO-92 package]
Familiar regulator features such as over temperature and over current
protection circuits are provided to prevent it from being damaged by
abnormal operating conditions.

 

[RF King]

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[Lostgallifreyan]

Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns998DAC1CB7573zoodlewurdle@140.99.99.130:

John E. <incognito@yahoo.com> wrote in
news:0001HW.C2E86E0102E3300EF01826C8@news.sf.sbcglobal.net:

Watch out for seller "goodbuy711" on ebay. He has tons of
transistors listed at inflated prices. And - if you look carefully,
you will see that many, many of them are actually counterfeits.

Thanks for the warning.

How can you tell it's counterfeit?

The date code, I think. 0512 = 12th (working) week in 2005, but Motorola
sold off their semiconductor manufacture, which became ON Semiconductor.

I mean, they sold it in 1998 or 1999. No Motorola branded parts made after
that time.

 

[Joerg]

Hello Folks,

After some Google searching and perusing the sites of the usual
contenders I only found one uC family that has serious on-chip RF
transceiver capabilities, the Cypress CYWUSB6953 and its brethren.
rfPICs and others usually only have a transmitter.

Anyhow, the Cypress will only serve 2.45GHz but I need the lower UHF
bands for range reasons. Is anything coming down the pike soon or will
that have to remain a two-chip solution?

--
Regards, Joerg

http://www.analogconsultants.com/

 

[John Larkin]

On Fri, 05 Sep 2008 12:55:09 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

John Larkin wrote:
On Fri, 05 Sep 2008 10:18:59 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

So here I am, needing more than the usual 32V opamp. Chose ye olde
MC33174 because it can take 44V but was surprised when I read that the
usual SO14 package is only rated at 154C/W. Since I am burning 500mW
that would become too toasty, ouch. Or I'll have to idle two amps each
in there and double the number of chips.

So, is 500mW in a SO14 really too much? What do thee say?

Epoxy a heat sink on top. I have a board right here on my desk that
has a heatsink on an FPGA, and two more on some dual dacs.

ftp://66.117.156.8/DSC01786.JPG


A heatsink glued onto a BGA? Wow, that takes guts.

Guts? Why? It's soldered to the board in 456 places, which should be
pretty stiff.

Or put a power pad below on the pcb layout, some thermal vias to a
plane, and use a dab of epoxy between the part and the board.


Nah, I'll go to singles but right now I am trying to knock down the
power via some inductive kicker tricks. It's a HV switch bank where
these opamps have to hold programmable biases. If I can shave off
another 500uA/channel I might just be back to a quad package. Unless
there is a really compelling reason like I am sure there is in many of
your cases I try to keep everything cool, to the point where you can
operate without heatsinks yet touch everything with screaming. Well, ok,
one should not touch this high voltage stuff ...

I've got used to touching everything to see how hot it is, or to
finagle suspected RF oscillations. And get occasionally
blistered/shocked for the trouble.

John

 

[Joerg]

Spehro Pefhany wrote:

On Wed, 02 Jan 2008 17:03:57 -0800, the renowned Joerg
notthisjoergsch@removethispacbell.net> wrote:

Spehro Pefhany wrote:
On Wed, 02 Jan 2008 22:50:20 GMT, the renowned Joerg
notthisjoergsch@removethispacbell.net> wrote:

Spehro Pefhany wrote:
On Wed, 02 Jan 2008 11:20:44 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Spehro Pefhany wrote:
On Wed, 02 Jan 2008 12:23:18 -0500, Fred Bloggs <nospam@nospam.com
wrote:

Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:


Dave Platt wrote:

In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:



Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.
The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.

Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.
Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards,
Spehro Pefhany
Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.
Around bipolar TTL? <checks calendar> whew, 2008, not 1982.. ;-)

Don't know if this ever made it to America: Siemens had artificially
slowed logic chips, called "langsame stoersichere Logik" or slow and
interference-insensitive logic devices. Those could make for some
spectacular SOA burn-outs. Seriously, I had to debug designs where they
drove transistors directly. Phsssst ... BANG.
Was that like HNIL? Power-hungry, 15V (?), very tough devices.

Yeah, 15V, threshold brought to 6V or thereabouts via zener, like this one:

http://pdf1.alldatasheet.com/datasheet-pdf/view/158177/ETC/FZH215S.html

Here's Motorola's family.. I don't think it was ever very popular.
Slow, expensive etc., but would have saved more than a few industrial
products from flaky-ness.

http://pdf1.alldatasheet.com/datasheet-pdf/view/107778/ETC/MC663/datasheet.pdf

That page errors.


Strange.. it works here. A search on that site for MC663 should find
the data.

It's probably reserved for Canadian viewers

But yes, these slow chips were often muffling flaws in
truly horrible designs. Anything that collapses when using faster chips
is IMHO shoddy design.

Oh, no doubt, but the combination of slow speed, high voltage, and low
impedances made the chips MUCH more immune to the sort of electrical
environment in industrial situations (big motor starting, solenoids
sparking, arc welders and that sort of thing). If it takes two or
three orders of magnitude more energy to flip a bit, then the EMC
precautions can be much simpler and less expensive.

Sure does, and it has caused engineers to become complacent. Just one
case: One fine day da boss decided they wanted to control something via
radio. Brilliant idea. Worked on the bench. Out to the production
facility and ... ka-crunch. Turns out they had left out any and all EMI
filtering on inputs because the chips offered volts of immunity. But the
diodes in there rectified RF and radiated it back out on the attached
(loooong) cables. Oops.

--
Regards, Joerg

http://www.analogconsultants.com/

 

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[Michael A. Terrell]

robb wrote:

any suggestions on source for small carbon brushes (small quantity)

i did do a google search.... lots of mfg sites or for large quantity
wholsale purchase mostly for larger motor applications

looking for 0.220" x 0.220" by 3/4" long shuntless (just spring) size brush
for low rpm A/C motor

thanks for any help,
rob

Have you tried the local hardware stores? Several chains carry them
in those flip down drawers where they have oddball hardware, toggle
switches, springs and such. That size sounds like an old sewing machine
motor. That would be another place to check, if you have an old
fashioned repair shop in your area that repairs, rather than replaces
the motors.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Floyd L. Davidson]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

"Floyd L. Davidson" wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

Look, I've designed line interfaces FFS. For Xerox. I've already
mentioned it once.

You can say anything you like, but when you make up all
the ridiculous garbage you are posting to this thread
there is little doubt that you haven't got even the
faintest clue how telecommuncations equipment works.

Want to to see the schematics ? I'm sure I still have them here
somewhere.

Yes, I would like to see them. Probably better than the
Sunday funny paper.

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@apaflo.com

 

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[Eeyore]

Michael wrote:

Max current for 2n2222 seems to depend on manufacturer.

It SHOULDN'T ! It's a JEDEC registered device. They're all supposed to comply with a
single spec.

Graham

 

[Joerg]

Pieter wrote:

On Tue, 13 Nov 2007 17:49:50 GMT, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Hello Folks,

What would be a really low noise FET? Should be well under 10nV/rtHz at
the lower end of the audio band, say at 20Hz. Ideally 5nv/rtHz. Looked
at former Matsushita parts, now Panasonic:

2SK3426: Supposedly good but no specs to wrote home about.
2SK2593: Says 2.5dB NF at 100Hz but as usual no graphs.
2SK2751: Could be the best, claims low noise but _no_ noise spec at all!

To say it mildly specsmanship isn't exactly what it used to be and my
experience in obtaining additional info from Asian companies is, well, a
bit mixed.

Hi,

I asked the same two weeks ago. And Jon Elson replied: InterFet
IF9030. The datasheet looks very good.

It's just a one-pager what I found but yes, the IF9031 and others do
look nice. Might have to call them up to see how they are sold. The
distributors I looked at don't carry that manufacturer.

What are you building?

Not allowed to tell ;-)

--
Regards, Joerg

http://www.analogconsultants.com/

 

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[Eeyore]

Tim Williams wrote:

I wish they made TO-220's that could handle overload.

Nothing specific about TO-220s in that regard.

Graham

 

[JeffM]

Angus wrote:

We have computers in our home plus a large screen TV. It would be
great to be able to have a little keyboard and browse the internet on
our large TV screen. How can this be achieved?

This is NOT a computer hardware group.
This group is about transistors, transformers, capacitors--that sort
of thing.

There are apt groups for computer hardware:
http://groups.google.com/groups/dir?sel=usenet%3Dalt.comp.hardware

 

[Hammy]

On 24 Feb 2009 02:35:50 GMT, ba221@FreeNet.Carleton.CA (Gaetan
Mailloux) wrote:

Hello

Last week a US parts store refuse an order because they do not ship in
Quebec, but they ship in other province of Canada !

Few month ago Mouser ask $25 of chipping for few parts.

Btw, since I do not have Paypal or any credit card, every time I did buy
in US I do have to pay by postal money order in US money, so it cost close
to $5 more, added to the shipping cost.

So US buying are quite finish for me.

Most of the time I take my parts on old PC or others kind of board,
because of my small budget, but sometime the parts I need are not on those
old boards.

Thank guy's

Bye

Gaetan

I Live in Canada, Ontario. I have no problems getting orders from any

of the major distributors. One time about 5 years ago Allied ask for a
fax for personal info what I do etc. I don't know if they still do
that.

You are better off dealing with their preferred courier usually they
have deals with couriers that include in the shipping fee customs
brokerage. Typical courier fees are from $8 to $12. My orders aren't
in the thousands of dollars usually somewhere in the $60 to $200
range.

Maybe try this place they have a franchise in Quebec.

http://www.futureelectronics.com/en/Pages/index.aspx