audio recording on IC -help wanted

[Michael A. Terrell]

test equipment buyer wrote:


More ignorant spam, of course. What a loser!


--
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

 

hi
Do you want to know some IC products? It can make many of our commonly
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TS80C32X2-LCJR ASMC-PAB9-TX805 HY27UA1G1M IDT72V03L35J V300A12M250B
SN65HVD11Q W78LE812F-24 MI-P2WK-IXA A42MX09-1CQ100M XC2C64-4CP56C
ZLLS2000 BZT55C56 5962-8957701ZXA CCL150DY1-DCP TL052IDR
PSD4135G1-20JI JAN1N4583URTR-3 HDSP-K213-I0000 COP8SGB728N6
DF13A-8P-1.25DSA VI-2NDCV XC6203P20ATH M29F002BNT90K1T M38B46M8H-
XXXXFP NX8570SC489-BA XC2V500-5FG256I IXDN 75N120 M74HC646M1R
P6KE6.8A SN54HC259FK MI-QC2NZ-MYY 2SA1310 5962R8864402-UXA CY7B992-5
HLMP-3601OO02 JANTX2N1485 MC14000UBD MI-P61P-IXX MTN2456-AG
PIC17LC42-33I/PQ SST49LF080A SN75164B HCF4096B AME40AEATZ
If you want to know their datasheet ,you can click here
such as http://www.chinaicmart.com/series-CY7/CY7B992-5.html
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[RHRRC]

Help!!

I am looking for an alternative to the ST micro. BUV48AFI npn bjt.
It is a 450V Vceo device in a isolated package (ST proprietry
ISOWATT-218 package).
ST are discontinuing it and they have no suitable alternative.


It is not being used in a switcher so these related characteristics
(ton etc) are irrelevant - it is being used in linear mode. What is
important is the package which must be a similar physical size (eg
TO-3P,TO247 ....),it must be isolated (fullpack,FP or whatever) and
the beta must be 30+ at an Ic of 200mA.
Max circuit Ic is 0.5A

Unfortunately a T220 will not do.

Required ~2kper month ongoing for next few years (min 3 yrs)

Regards

 

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[Eeyore]

"John E." wrote:

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?

It has the Motorola logo on a part that's date coded 0512. (wk 12, 2005)

Motorola long ago sold their discretes manufacturing to On Semiconductor. The
part should marked 'ON' not Motorola.

Graham

 

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[Rich the Philosophizer]

On Sat, 15 Sep 2007 21:18:54 -0700, bill.sloman wrote:

On Sep 13, 3:40 am, Drexterity <1001w...@gmail.com> wrote:

Please, explain what that device has to do with a "proposed device
able to guide chemical reactions by positioning reactive molecules
with atomic precision." to this hopeless ignorant soul.

Nobody here takes Drexler very seriously, and this thread has been
happily satirising his proposition. If we ever do get into that kind
of nanotechnology, it will probably be via genetic engineering, which
has the advantage of being practicable.

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Cheers!
Rich

 

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[Smitty Two]

In article <wKj9j.44118$K27.14785@bignews6.bellsouth.net>,
"mc" <look@www.ai.uga.edu.for.address> wrote:

why is 63-37 eutectic solder not universally preferred?

Because sometimes you want mush.

Eutectic is either solid, or liquid.

Formulations off eutectic have a range of mushiness, which can be of use.

...
Not wanting to be confrontational, just curious. Wikipedia lists melting
points as:

63/37: melts between 180-185°C
60/40: melts between 183-190°C
50/50: melts between 185-215°C

I'm not aware of any soldering process that is able to control
temperature so closely as to not melt one, while melting another of
those formulations. Can you elaborate?

It's not whether you can melt it, it's how it hardens. Eutectic solder
hardens very suddenly. 60/40 solder goes through a fleeting stage of being
viscous but not yet completely hard. I'd like to hear more about this, but
I'm told some people prefer the "feel" of one vs. the other.

If you're going to quote me, I'd appreciate it if you wouldn't snip all
contextual relevance out of the discussion. As it is, your post might
appear to the casual observer as bearing some relevance to the topic at
hand. It may be a response to the OP, but it certainly isn't relevant to
the sub-topic of sequential soldering using a variety of formulations.

 

[David L. Jones]

On Jan 22, 2:21 am, krw <k...@att.zzzzzzzzz> wrote:

In article <31f7ee1b-796f-4a26-a7e4-7755648e2ad2@
35g2000pry.googlegroups.com>, energymo...@gmail.com says...



On Jan 21, 8:17 am, Paul <energymo...@gmail.com> wrote:
On Jan 21, 7:34 am, Stuart <Spam...@argonet.co.uk> wrote:

In article <MPG.23e0f291d9e4acfc989...@news.individual.net>,
krw <k...@att.zzzzzzzzz> wrote:

Totally useless in areas of high RF.
Wrong.

That statement simply exposes another large hole in your knowledge and
experience.

I spent 20 years on a high power HF transmitting station - believe me - I
*know*

As the man says, the proper tool for the job

I would agree. Take two meters. One is 1Kohms. The other is 1Gohms. If
the load is low impedance, say 100 ohms, then there's an appreciable
error with the low impedance meter-- simple ohms law. While the error
associate with the high impedance meter is unmeasurable.

People are probably confusing the fact that a high impedance meter
while unconnected to anything will pick up signals, for obvious
reasons.

Paul

Sorry, I didn't pay much attention who I was replying to. I'm not
taking sides, but I am saying that high impedance meters are better.

Right. It's easy to lower the effective impedance of a high
impedance meter.

Safely, in a dangerous situation?
What part of using the right tool for the job don't you understand?

Yes, High-Z meters are good (more useful in more cases), but Low-Z
meters have their place too.
There simply isn't any argument here, if you need a Low-Z meter, use
one. If you need a High-Z meter, use one. "Making do" without the
right tool in serious situations is stupid.

Going the other way is a lot harder.

Agreed. That's why if you have serious needs you either have a dual
purpose meter, with Low-Z and High-Z modes, or you have two meters.

Dave.

 

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[Hal Murray]

The transformers we use are the 14VA types which are split primary and
secondary, we are running the transformer at around a 50% load factor with
occasional peaks for about 10 secs to about 80% rating. When there is a
'burn-out' the blackening only appears in one of the four bobbin segments,
sometimes one of the primary and sometimes one of the secondary windings.
This seems to point that it is not overload problem as I would expect to see
both the primary or secondary windings 'burn' together but so far this has
never been the case.

One of the failure modes for a transformer is to get a short between
adjacent wires. That makes a shorted loop. You get one turns worth
of voltage across the loop which usually means lots of current and
hence lots of heat. Soon the insulation on adjacent turns breaks
down and it just gets worse... (Positive feedback.)

Are you running any voltage spikes that might breakdown the
insulation? How hot are they normally running?


--
These are my opinions, not necessarily my employer's. I hate spam.

 

[Michael A. Terrell]

Bungalow Bill wrote:

I'm an idiot.

--
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

 

[Lostgallifreyan]

"Bogo Joe" <bojo@joed.com> wrote in
news:4764f8bb$0$18717$6c495a8a@free.hitnews.eu:

These test messages are purposely filled with inaccurate and misleading

Nuff said, probably.

 

On 20 Dec, 01:16, SloppyChoppy (Chun...@zongazonga.zip) wrote:

Before risking the chip to an unsure reading process, I would check
that the reset circuit is not sending multiple pulses to the chip.
The reset is responsible for setting the digital stuff to the
same sync point and initialize the startup values...  If it's sending
multiple pulses, it can cause similar problems.  Sometimes the reset
is simply a single small chip or Transistor-resistor-Capacitor-cmos gate
arrangement.  A good logic probe or O-scope should help.

Cars power systems are very harsh... so there would mostlikely be a voltage
regulator for that chip somewhere near it.  I would check that those parts
haven't degraded.. Flakey regulator, clamping diodes, capacitors can cause noise
on the PS lines.  A Fast needle meter or O-scope should help here.

--
--------------------------------- --- -- -
Posted with NewsLeecher v3.8 Final
Web @http://www.newsleecher.com/?usenet
------------------- ----- ---- -- -

Hi,
Thanks for your help....here's a few pictures of the circuit
board...can you see / direct me to any of the components you mention.

http://i130.photobucket.com/albums/p256/on1wheel_2006/Picture001.jpg

http://i130.photobucket.com/albums/p256/on1wheel_2006/Picture007.jpg


Regards.

 

[Jamie]

Archimedes' Lever wrote:

On Sat, 3 Jan 2009 18:15:14 -0800, "William Sommerwerck"
grizzledgeezer@comcast.net> wrote:


Why do you think that insulting me is going to get me upset or do your
reputation any good?


How can such an idiot actually think that he knows "what I think"?

No has to read your mind, when all you do is speak your mind.

http://webpages.charter.net/jamie_5"

 

[Eeyore]

Wolfi wrote:

I got one of those small, 1/3W, maybe even 1/2W, fusible metal film resistors,
which burnt through, due a failing diode in a computer monitor's SMPS.

Now I'm having some trouble to identify the value of this R. There a 5 colour
rings on it, distributed symmetrically.
In the center: BlK - Gld - Blk and, a hair thinner, Red and what appears to be
Brn, one on each side on the thicker contact caps.

Now, how is this one to be read, starting with Red or with Brn?
And what is the meaning of the 2 rings following the gold one? Which one is
tolerance and what is the other one for?

The blown diode has the following on it: B119 HER303 (1,3mm wires, body
9.2mm × 5.2mm diameter).

Could anybody please provide some specs on it and possibly one or more
suitable replacement types?

HER303 is a rectifier.
http://www.google.com/search?&q=her303

Graham

 

[bz]

Smitty Two <prestwhich@earthlink.net> wrote in
newsrestwhich-BF7927.14305215122007@news.phx.highwinds-media.com:

In article <LawrenceSMITH-1D07DE.17221515122007@news.verizon.net>,
Ecnerwal <LawrenceSMITH@SOuthernVERmont.NyET> wrote:

In article
a232ec67-c9bd-42ad-99f3-d65b3d00b960@t1g2000pra.googlegroups.com>,
dances_with_barkadas@yahoo.com wrote:

why is 63-37 eutectic solder not universally preferred?

Because sometimes you want mush.

Eutectic is either solid, or liquid.

Formulations off eutectic have a range of mushiness, which can be of
use.

And they have higher melting points, which can be of use in multipart
assemblies, where you might use 50-50, 60-40 and 63-37 to assemble and
solder a series of parts.

Interesting. I've not heard of this before. Do you speak from:

1> experience
2> rumor
3> speculation

Not wanting to be confrontational, just curious. Wikipedia lists melting
points as:

63/37: melts between 180-185°C
60/40: melts between 183-190°C
50/50: melts between 185-215°C

I'm not aware of any soldering process that is able to control
temperature so closely as to not melt one, while melting another of
those formulations. Can you elaborate?

When I worked as a process engineer for Sprague Electric Co, in the early
70's, making capacitors and resistors, we used 95/5 solder, I think it was
tin/lead with a small amount of silver, to assemble the capacitors and
resistors.

One reason for that choice was so that the parts would withstand normal
60/40 soldering when boards were assembled.

Like you, I have some doubts about the kind of close control that would be
needed to use mixes as close as the ones given.






--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

bz+ser@ch100-5.chem.lsu.edu remove ch100-5 to avoid spam trap

 

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[Eeyore]

Phil Allison wrote:

plus cap couple the input side to stop pulling the line low.

Damn right ! Not ONE of these 'phone experts' has mentioned that.

Graham