audio recording on IC -help wanted

[Watson A.Name - \"Watt Su]

<shoppa@trailing-edge.com> wrote in message
news:1117280737.210395.281170@g47g2000cwa.googlegroups.com...

I'm the new proud owner of a R-390A. (Some will say I'm a fool but
I had to follow my heart!) It's rackmount, which is great because
I've got rack space. I want to keep it well fed and ventilated.

I'll agree with those some others. I used the mil equivalent of the
R-390 when I was in the army in the late '60s in Germany, and I was
stuck in a radio van on the back of a deuce-and-a-half. One consolation
was that it didn't need much heating in the winter. I think the one I
used was made by Motorola (or were they called Galvin?).

At the moment, the rack has a 10" EG&G/Caravel Rotron fan in the top.
It moves a lot of air and generates a fair amount of noise. Not
bad in a computer room, but I want to hear the radio instead of the
fan.

I anticipate keeping the R-390A on more regularly than my other tube
radios (Heathkits etc.). Probably several hours a day.

The radio site was right next to the 100kW diesel generators that ran
24/7, just to run all those toobs and air conditioning they needed to
cool them. Nothing like a diesel generator to keep you awake all the
time. The guy that bunked in my cubicle used to bring his (Dave Clark)
earmuffs to bed with him, and sleep with them on. I never could figure
out how he did that. ;-)

In addition, the radio probably isn't as thermally stable as it could
be if
I'm sucking lotsa air through it. Someone might tell me that it's
bad to use a fan for some other reason.

Use a filter to keep out the dust and reduce the noise.

Which way to go? Speed control on the fan to slow it down and keep
it quiet? No fan at all, because the R-390A was designed not to need
it? Some vastly more quiet and appropriate fan?

Puff up your chest with pride and show off your R-390 boatanchor a
couple times a year to your ham buddies, and the rest of the time use a
Sony ICF whatever they are or similar general coverage receiver. ;-)

Mount a panel with a speaker in it in the rack, and connect the Sony to
it, and your friends will never know. You'll have a lot lower electric
bill this summer. )

> Tim. (KA0BTD)

 

[Mark Zenier]

In article <1117159919.949571.325770@o13g2000cwo.googlegroups.com>,
isaac <ssamlove79@naver.com> wrote:

LS7232ND
I need a datasheet for LS7232ND LAMP DIMMER(LSI)

Does anybody know where I can find one or something that can help me
out?

I Can not found in any places on the Internet

Is that an LSICSI part? They used to be at www.lsicsi.com .

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Scott Dorsey]

In article <1117280737.210395.281170@g47g2000cwa.googlegroups.com>,
<shoppa@trailing-edge.com> wrote:

At the moment, the rack has a 10" EG&G/Caravel Rotron fan in the top.
It moves a lot of air and generates a fair amount of noise. Not
bad in a computer room, but I want to hear the radio instead of the
fan.

So add a power resistor and drop the voltage until there is around 80V on
the fan. It will move less air, but it will be very quiet.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

"Watson A.Name - \"Watt Sun, the Dark Remover\""
<NOSPAM@dslextreme.com> wrote:

http://www.geekinformed.com/content/view/241/1/

No, but maybe a replacement for Flash, except that I'd expect a
phase-change to be slower than charging a capacitor, so I guess we'll
have to see if this escapes from the lab...

 

[A. Boisvert]

Go to the application notes of the LSICSI site and look at application notes
AN304 ND an701. You may find your answer there as suggested by Mark.
"Mark Zenier" <mzenier@eskimo.com> wrote in message
news:d7abkv$6se$1@eskinews.eskimo.com...

In article <1117159919.949571.325770@o13g2000cwo.googlegroups.com>,
isaac <ssamlove79@naver.com> wrote:
LS7232ND
I need a datasheet for LS7232ND LAMP DIMMER(LSI)

Does anybody know where I can find one or something that can help me
out?

I Can not found in any places on the Internet

Is that an LSICSI part? They used to be at www.lsicsi.com .

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Dave Platt]

In article <1117657830.521148.39580@g14g2000cwa.googlegroups.com>,
Andy Eng <aengster@gmail.com> wrote:

I'm familiar with custom hybrids with parallel processing dies and must
confess to not having kept up with the industry over the past decade --
That both Intel and AMD are now mass producing duals in a single
package, are the factories bumping up against Moore's law or are these
devices simply taking advantage of available packaging advances?

As I understand it, there are some interesting gotchas which are
currently affecting the applicability of Moore's Law to processor
design.

As you increase the number of semiconductor junctions per square, you
end up having to use even-finer-pitch deep-submicron fabrication
processes, thinner gate insulators, and lower voltages. Parasitic
effects (inductance and resistance of the metal layers, capacitance
between nearby traces and gates) begin to have a significant effect on
the circuit performance.

Leakage current across the gates and through the transistors starts to
climb, so that even a circuit which isn't being clocked is drawing
power and dissipating heat. This can necessitate the use of
variable-voltage circuitry (parts of the chips which can run at lower
speed are fed lower voltages), or smart-powerdown logic, etc.

Total power supply currents become quite large (many tens of amperes
at 1-2 volts) and the high currents lead to higher I*2*R losses.
Power densities on the chip increase, leading to a need to remove a
great deal of heat, very efficiently, from a very small area. I've
seen pictures of what happens (very quickly) if an Athlon CPU loses
its heatsink... smoke and flames within a few seconds. There was one
famous comment made not all that long ago, that if power densities
continued to climb at their current rate, it wouldn't be many years
before a high-end CPU has a power dissipation rate equivalent to a
similar-sized patch of the sun's surface!

What it boils down to, is that in some situations, you can get a
certain amount of total CPU performance less expensively by using two
or more CPUs or cores, clocked at a lower speed, in place of a single
CPU/core clocked at a higher speed. As long as the operating system
is capable of taking good advantage of multiple CPUs, money can be
saved.

I saw one embedded-system board described this week in a trade rag,
which uses a pair of 1-gig VIA processors rather than a single
higher-speed CPU. It's capable of running with passive/convective
cooling only - no CPU fans.

So, I think the answer to your question as to whether it's improved
packaging / expertise, or problems in taking advantage of Moore's
Observation, is that it's both.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the 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!

 

[Wouter van Ooijen (www.vo]

I'm familiar with custom hybrids with parallel processing dies and must
confess to not having kept up with the industry over the past decade --
That both Intel and AMD are now mass producing duals in a single
package, are the factories bumping up against Moore's law or are these
devices simply taking advantage of available packaging advances? I've
no doubt their accountants weighed in on this one...

With more and more gates available the chip designers have the problem
what to use them for. More execution units for the same instruction
stream won't do much good when they have to wait for branches to
decide which instruction stream will be the one to execute. Executing
multiple indepenent instruction streams puts the extra silicon to some
use, provided of course that the OS and/or the application can provide
an extra instruction stream.


Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
Webshop for PICs and other electronics
http://www.voti.nl/hvu
Teacher electronics and informatics

 

[mc]

Right; the thing is that with TMS, they first established that it
definitely has an effect on the brain; it can make people twitch,
for example, when a motor area is stimulated; so the only
question now is how to get a *beneficial* effect.

It's important to keep in mind that the effects depend upon
*changing* magnetic field gradients. Thus we see that the
observed results with TMS cannot validate the use of magnets.

Thank you, Mr. Faraday

So TMS is actually not a magnetic effect at all, but rather, localized
generation of electricity. Right?

 

[Otaku]

Etantonio wrote:

Good Morning,
I've a Gericom Webshox laptop, it is of 2001, I changed the battery
but it is still not working, the problem seems to be that the 15 volts
coming from power supply don't reach the battery, they seems stopped
from an 8-pin dual in line IC named 4431 1503 that I don't know who is
the manufacturer, I search for it on internet but with no results.
To solve the problem I need the following information :

1) Who is the producer of this IC 4431 1503 or equivalent, it have
4431 in the first line, a little delta on the second line and
following 1503
2) where I can find the schematic of the motherboard N241S1 ver:0.1
possible for free

Many thanks for your help

Antonio D'Ottavio
etantonio@etantonio.it

Heh - iirc thats a Vishay Siliconix part.. If you find a supplier of
these in small quantities, let me know - I've 2 laptops here that need
replacement 4834s but I haven't found anywhere that deals with them and
will sell small quantities.
hth
O.

 

[Don Klipstein]

In article <7y1pe.42735$Wr.42557@fed1read04>, mroberds@worldnet.att.net wrote:

In sci.electronics.design Tim Shoppa <shoppa@trailing-edge.com> wrote:
Does anyone know if there exists, preferably on the web, a set of
graphs that show current vs voltage (or resistance vs RMS power or
any other equivalent) for common low-voltage bulbs? I'm specifically
looking for bulbs which may serve as a decent AC current regulator.

I have a Wagner Lighting automotive lamp catalog that has a table with
some of this information, but it's general data, not specific to each
lamp number.

I once heard that there are empirical formulas for this involving odd
things like thirteenth and ninth powers, but I don't recall exactly
what they are.

I have taken the liberty of cross-posting (and setting followups)
to sci.engr.lighting, which should yield much better info.

I somewhat remember the "one-size-fits-all rule" at least sometimes
saying that current is proportional to voltage raised to the .42 power.

I have found this exponent to be more like .52 with a high current gas
filled lamp (9005 halogen high beam bulb), and .57 with a vacuum lamp
(either 25 or 40 watt 120V "T10" showcase/refrigerator lamp). I expect
this exponent to be less with gas filled lamps with design current a
lot less than that of the 9005.
I also expect this exponent to vary with voltage when the voltage gets
low - often decreases in gas filled lamps, but has to increase towards 1
once the voltage decreases so much that the filament temperature is close
to room temperature.

- Don Klipstein (don@misty.com)

 

[Mark Zenier]

In article <1118204681.036680.168230@f14g2000cwb.googlegroups.com>,
<davidfilmer@gmail.com> wrote:

I would like to buy one Motorolla MC68008P10 16-bit processor. The
only sources that I can find are OEM suppliers that want big minimum
orders.

Does anyone know where I can find this processor for sale in
single-unit quantity (preferably from a US supplier)?

Thanks!

First guess would be Jameco or maybe B&G Micro, two mail/web order
outfits that do surplus and pulled chips.

The suffix is just the package and speed, so either a P or L (cerdip)
part, 10 MHz or faster, would work. (I think they came in 8, 10, 12
and 16 MHz selections). Avoid an FN (chip carrier) part.

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Spehro Pefhany]

On 10 Jun 2005 12:18:44 -0700, the renowned "RobMiller"
<Robert.F.Miller@gmail.com> wrote:

Does anyone know the switching speed of 1n400x diodes or where to find
it? Can't find it in normal specs.

thanks

Typical trr is in the 1-20usec range, tfr as much as a microsecond,
depending on conditions.

If you care about it exactly, you probably shouldn't be using this
kind of diode.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Watson A.Name - \"Watt Su]

"RobMiller" <Robert.F.Miller@gmail.com> wrote in message
news:1118431124.955708.187170@f14g2000cwb.googlegroups.com...

Does anyone know the switching speed of 1n400x diodes or where to find
it? Can't find it in normal specs.

thanks

If you are going to use them for more than a few hundred Hz, then you
should use a diode made for fast switching, like the 1N4933 thru 37.

 

[Ken]

On 10 Jun 2005 12:18:44 -0700, "RobMiller" <Robert.F.Miller@gmail.com>
wrote:

Does anyone know the switching speed of 1n400x diodes
or where to find it? Can't find it in normal specs.

Normally trr is 30 usec.

 

[Spehro Pefhany]

On Fri, 10 Jun 2005 21:14:19 -0700, the renowned "Watson A.Name -
\"Watt Sun, the Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"RobMiller" <Robert.F.Miller@gmail.com> wrote in message
news:1118431124.955708.187170@f14g2000cwb.googlegroups.com...
Does anyone know the switching speed of 1n400x diodes or where to find
it? Can't find it in normal specs.

thanks

If you are going to use them for more than a few hundred Hz, then you
should use a diode made for fast switching, like the 1N4933 thru 37.

Or the UF400x, which requires even less thinking, and has trr in the
50-75ns range.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Mark Zenier]

In article <11aif56dk2sg9c8@corp.supernews.com>,
Watson A.Name - \"Watt Sun, the Dark Remover\" <alondra101@hotmail.com> wrote:

I obtained several NSB3411 red LED displays, and I think they're for a
digital clock since they have the colon in the center. I ohmed out the
pinout, no problem. I got nothing on www.national.com. I did a google
and came up with a handful of hits, just wanting to sell them to you.
What I would like to know is what is the maximum current per segment,
and if each of the segments has more than 1 LED in series. Seems like
it takes 4V or more to get it to light up. Thanks.

Did you try Three-Five (or III-V), the outfit that took over National's
opto-displays?

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Watson A.Name - \"Watt Su]

"Mark Zenier" <mzenier@eskimo.com> wrote in message
news:d8f3gb$q79$1@eskinews.eskimo.com...

In article <11aif56dk2sg9c8@corp.supernews.com>,
Watson A.Name - \"Watt Sun, the Dark Remover\"
alondra101@hotmail.com> wrote:

I obtained several NSB3411 red LED displays, and I think they're for
a
digital clock since they have the colon in the center. I ohmed out
the
pinout, no problem. I got nothing on www.national.com. I did a
google
and came up with a handful of hits, just wanting to sell them to you.
What I would like to know is what is the maximum current per segment,
and if each of the segments has more than 1 LED in series. Seems
like
it takes 4V or more to get it to light up. Thanks.

Did you try Three-Five (or III-V), the outfit that took over
National's
opto-displays?

No, I knew nothing about them until you told me. Thanks, I'll see what
I can find. I tried looking in the HP opto manual but I couldn't find
anything close to it. Thanks. BRB...

I found this URL http://www.tfsc.com/ but I'm not sure if it's the right
company. In their history they mention buying a div of National, but I
could find nothing on LED displays on their website. I clicked on
display prod and tech library and they said that they sold some div to
some other co, but it doesn't seem to be a LED display maker.
Apparently no way to do a search.

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Watson A.Name - \"Watt Su]

"Mark Zenier" <mzenier@eskimo.com> wrote in message
news:d8f3gb$q79$1@eskinews.eskimo.com...

In article <11aif56dk2sg9c8@corp.supernews.com>,
Watson A.Name - \"Watt Sun, the Dark Remover\"
alondra101@hotmail.com> wrote:

I obtained several NSB3411 red LED displays, and I think they're for
a
digital clock since they have the colon in the center. I ohmed out
the
pinout, no problem. I got nothing on www.national.com. I did a
google
and came up with a handful of hits, just wanting to sell them to you.
What I would like to know is what is the maximum current per segment,
and if each of the segments has more than 1 LED in series. Seems
like
it takes 4V or more to get it to light up. Thanks.

Did you try Three-Five (or III-V), the outfit that took over
National's
opto-displays?

I found this listing for another company but I couldn't find their web
page.
http://www.devicelink.com/company98/co/210/21093.html Still looking..

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Mark Zenier]

In article <d8f3gb$q79$1@eskinews.eskimo.com>,
Mark Zenier <mzenier@eskimo.com> wrote:

In article <11aif56dk2sg9c8@corp.supernews.com>,
Watson A.Name - \"Watt Sun, the Dark Remover\" <alondra101@hotmail.com> wrote:

I obtained several NSB3411 red LED displays, and I think they're for a
digital clock since they have the colon in the center. I ohmed out the
pinout, no problem. I got nothing on www.national.com. I did a google
and came up with a handful of hits, just wanting to sell them to you.
What I would like to know is what is the maximum current per segment,
and if each of the segments has more than 1 LED in series. Seems like
it takes 4V or more to get it to light up. Thanks.

Did you try Three-Five (or III-V), the outfit that took over National's
opto-displays?

Oh yea, I forgot to say, try Jameco's web archive. They might have a
datasheet under either National or Three-Five's part number. They had
a whole pile of that stuff for years in their catalog.

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Jim Adney]

On Sat, 11 Jun 2005 08:46:54 -0400 Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

On Fri, 10 Jun 2005 21:14:19 -0700, the renowned "Watson A.Name -
\"Watt Sun, the Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

If you are going to use them for more than a few hundred Hz, then you
should use a diode made for fast switching, like the 1N4933 thru 37.

Or the UF400x, which requires even less thinking, and has trr in the
50-75ns range.

Who makes those?

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------