audio recording on IC -help wanted

[Tom Woodrow]

Sounds like you might be getting a destructive glith on either its
inputs or its power source.

Do you have FAST protection like a transzorb?

Tom Woodrow
www.dacworks.com

c deibele wrote:

Hi,

I am experiencing infant mortality of the Analog Devices AD600 wideband
voltage controlled gain operational amplifier.

The failure seems to occur on the order of one week, seemingly without
reason. The output of the op amp goes to the +5V rail. The second
op-amp goes noisy.

This problem is not experienced during burn-in. Power conditioning
shows nothing abnormal.

Has anyone experienced something similar with this part?

Craig Deibele

 

[Robert Monsen]

I recall a lecture by Bob Pease I listened in on describing an issue with
ESD killing opamps in the field. Something about a dentist office in Montana
in winter being the only place it happened...

The upshot was that if the output is directly connected to something that
can touched by the user and thus can be zapped by ESD, you can lose the
device.

Regards,
Bob Monsen

DISCLAIMER: I'm not an EE, I'm a hobbyist. Take what I say with a few
grains...

"c deibele" <deibele@sns.gov> wrote in message
news:bht6sv$3du$1@sws1.ornl.gov...

Hi,

I am experiencing infant mortality of the Analog Devices AD600 wideband
voltage controlled gain operational amplifier.

The failure seems to occur on the order of one week, seemingly without
reason. The output of the op amp goes to the +5V rail. The second
op-amp goes noisy.

This problem is not experienced during burn-in. Power conditioning
shows nothing abnormal.

Has anyone experienced something similar with this part?

Craig Deibele

 

[townt.com]

Dear sirs,

Yes. We have the chip ! It is an 4/8 bits mcu !

Let us know the QTY. you request ?

Thank !

Patrick Cheung
--
Town Target Technology Limited
1805-7, Wu Sang House,
655 Nathan Road, Mongkok,
Kowloon, Hong Kong
Tel : +852-2505-5838 Fax : +852-2900-9813
E-mail : patrick.cheung@towntarget.com.hk
http://www.townt.com

(All our e-mail is scanned by the anti-virus server to ensure virus free)



"Ken Finney" <kenneth.c.finney@boeing.com> źśźgŠóślĽóˇsťD
:HJxn8I.5Ew@news.boeing.com...

Anyone know of a simple voice chip? All I want is a chip that will say
the
digits one through nine, and either say "point", "dot", "period",
"decimal"
or something like that. I'd prefer one that is preprogrammed to say these
things. I've found a lot of complicated chip sets, and some that would
probably do what I want (but were obsolete), but nothing that I could
currently buy.

 

[CBFalconer]

Andras Tantos wrote:

.... snip ...

- Some folks went on a seamlessly endless ranting about
top-posting :-(.

Welcome to usenet . Of course, the way to avoid topposting
rants is simply to not do it, and to snip appropriately.

--
Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net> USE worldnet address!

 

[Fred Abse]

On Tue, 19 Aug 2003 09:35:08 +0100, ~^Johnny^~ wrote:

So, logically speaking, nitrocellulite would be good for blow-up
dolls? ;-

ROFL!


--
Then there's duct tape ...
(Garrison Keillor)
nofr@sbhevre.pbzchyvax.pb.hx

 

[Hans Summers]

"William P.N. Smith" <wpns@compusmiths.com> wrote in message
news:k3c4kv4pihtd745bprpkkv16sauod3cckl@4ax.com...

peterdeco1@aol.com (PeterDeco1) wrote:
Does anyone know an easy way in DOS or Windows to control the 8 data
lines in a
PC parallel port? I would like to selectively turn 1 or more on and off
at
will. Thank you.

Yeah, just output a byte to the parallel port address, using whatever
programming language suits you. The port address will usually be
found in your BIOS setup routines, and can be 0x0378 for LPT1.

But not on Windows NT/XP because the OS tries to hide the ports. But there
is a way, see http://www.hanssummers.com/electronics/clocks/matrix/index.htm
for explanation

Hans

 

[Si Ballenger]

On 19 Aug 2003 09:01:36 GMT, peterdeco1@aol.com (PeterDeco1)
wrote:

Does anyone know an easy way in DOS or Windows to control the 8 data lines in a
PC parallel port? I would like to selectively turn 1 or more on and off at
will. Thank you.

I've got the below page that shows some very simple ways to
control the parallel port just using notepad. There is a link
there to a free little program called userport that allows user
level access to the parallel port on NT/2K/XP machines. Bottom is
a very simple batch file I made for controlling my parallel port
pins (this one turns on pin #2). More how-to info on the web
page.

http://www.geocities.com/zoomkat/ppswitcher.htm

=====pin2.bat======

GOTO BEGIN
o 378 01
G
:BEGIN
DEBUG < pin2.bat

================

 

[Ray Collins]

You were looking for parts for a 4886 tube circuit contact me off list,
I may have the answer you are looking for.
Ray

Geoffrey G. Rochat wrote:

Looking to buy about 20-50 Dynamic RAM chips, 4027 4Kx1 16 pin DIP.

If anyone has these for sale, please email me at cmdr-dave@spamcop.net.



Take a look at www.unicornelectronics.com .

 

[Eugene Rosenzweig]

In dos you can use 'debug':
C:\>debug
-o port value
-q
C:>\>

I have never really used debug so I am not sure if the numbers should be hex
or decimal (e.g. 378 or 888).

"PeterDeco1" <peterdeco1@aol.com> wrote in message
news:20030819050136.12008.00000343@mb-m20.aol.com...

Does anyone know an easy way in DOS or Windows to control the 8 data lines
in a
PC parallel port? I would like to selectively turn 1 or more on and off at
will. Thank you.

 

[Watson A.Name - 'Watt Sun]

In article <ZYC1b.7557$QT5.1094@fed1read02>, zoram@cox.net
mentioned...

I have what appears to be a potted octal tube base with a GE number
43A142260P1.
Someone said it is an 4JS35.
Can anyone tell me what it is?
Thanks, Zoram

If you get diodes between pins checking with a DMM, then it's probably
a substitute for a 5U4 or other similar rectifier tube.

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

 

[Fred Abse]

On Sun, 24 Aug 2003 10:10:10 +0100, JT wrote:

I have some equipment with powersupplies , batteries etc. that has
broke. It looks like a fluid has been released from the deceased box...

Unfortunatly it has got into the box underneath...

What kind of components can contain some kind of fluid ?

Batteries, and it's damn corrosive.

--
Then there's duct tape ...
(Garrison Keillor)
nofr@sbhevre.pbzchyvax.pb.hx

 

[Ray Collins]

Capacitors oil and PCB's if they are old enough.

Sounds like you need the EPA.;-)

Fred Abse wrote:

On Sun, 24 Aug 2003 10:10:10 +0100, JT wrote:



I have some equipment with powersupplies , batteries etc. that has
broke. It looks like a fluid has been released from the deceased box...

Unfortunatly it has got into the box underneath...

What kind of components can contain some kind of fluid ?


Batteries, and it's damn corrosive.

 

[William P.N. Smith]

"E Draisma" <draisma1@xs4all.nl> wrote:

For an art project I need to build a small 1,5V power supply to power a
small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC.

http://www.national.com/an/AN/AN-181.pdf

--
William Smith wpns@compusmiths.com N1JBJ@amsat.org
ComputerSmiths Consulting, Inc. www.compusmiths.com

 

[Im anonymous]

Just use a LM317T regulator. Costs 1-2 bucks, and you'll need two resistors.

"E Draisma" <draisma1@xs4all.nl> wrote in message news:<3f49e87f$0$49116$e4fe514c@news.xs4all.nl>...

Hi there,

For an art project I need to build a small 1,5V power supply to power a
small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC.

I know a little bit about electronics, enough to build a simple schematic.
However, I can't find a schematic to do this; maybe anyone of you knows how
to do it?

I would be very pleased if anyone could help me!

Eibert Draisma.

 

*** post for FREE via your newsreader at post.newsfeed.com ***


frankhaussmann@web.de wrote:

Hi all,

does anyone know where I can buy a SLD with approx. 3 mW optical
output? Waveleght should be arroud 675 mW.

I found IR types on the web - but no visible ones. Any ideas?

Thanks

Frank

Hello Frank,

no problem, really. "Ultrabright" GaAlAs LEDs typically emit around 660
nm (not mW ;-) and drop about 1.8 V. At 20 mA this means 36 mW. So you
require about 8% quantum efficiency.

Take the LED3-3500RT from <www.reichelt.de> (3 mm diameter) for example:
catalog data of their LEDs are quite distorted, but a while ago they
were selling Kingbright LR934SRC/J under this designation (check with
them if they still do; Kingbright datasheets are on the web). The solid
angle of the LR934SRC/J is grossly overstated, but for a realistic
2theta1/2 of 30° the stated typical brightness of 2300 mcd works out to
something like 13 lm/W and about 26% quantum efficiency!

Martin.


-----= Posted via Newsfeed.Com, Uncensored Usenet News =-----
http://www.newsfeed.com - The #1 Newsgroup Service in the World!
-----== 100,000 Groups! - 19 Servers! - Unlimited Download! =-----

 

[Walter Harley]

"Im anonymous" <acctforjunk@yahoo.com> wrote in message
news:bffabe31.0308250653.71e1898a@posting.google.com...

Just use a LM317T regulator. Costs 1-2 bucks, and you'll need two
resistors.

Actually, since the MP3 player probably works fine at 1.25v (since an AA
drains down to around 0.8v before it's considered "dead"), and the LM317's
reference voltage is 1.25v, you could skip the resistors. Your 10v to the
LM317T input, "adj" pin to ground, 1.25v at the output. Read the LM317T
data sheet to see where to put capacitors to keep it from oscillating.

Assuming the MP3 player draws around 50mA from its battery, the LM317T will
be dissipating (50mA * 8.75v) = about half a watt. Probably okay without a
heat sink; definitely okay with a little heat sink clipped to it.

 

*** post for FREE via your newsreader at post.newsfeed.com ***


Jeroen wrote:

Hi,
I'm repairing a kenwood/trio cs-1022 scope and found out the input jfets are
fried (M47F-C) . I can't find any usefull information about it. The only
thing I found out it that they used to be manufactured by Matsushita
(panasonic?) And this are two matched jfets in one package.

Does anyone knows more about it? datasheet/replacement types...

I also thought of mailing Panasonic or Kenwood. But these are such big
companies I can't find out to which department I need to send it

Jeroen

Jeroen,

are you really sure about this designation? What is the number of pins?

On page 276 of their "table of obsolete parts (HAI-HIN-SHU
ICHI-RAN-HYO)" under

<http://www.semicon.panasonic.co.jp/cat/pdf/A00000HJ08-02.pdf>,

Matsushita (brand name Panasonic) list the "designation (KEI-MEI)" M47F
under "diodes, hole-particles (daiodo, horu-SO-SHI)", but without any
"substitute" (DAI-TAI-HIN).

So I would suspect some combination of protection diodes here.
Replacement shouldn't be very critical then.

Don't ask me why they refer to "hole-particles".

Martin.


-----= Posted via Newsfeed.Com, Uncensored Usenet News =-----
http://www.newsfeed.com - The #1 Newsgroup Service in the World!
-----== 100,000 Groups! - 19 Servers! - Unlimited Download! =-----

 

[Dan Fraser]

Electrolytic Capacitors have fluid too. Corrosive too.

--
Dan Fraser

From Costa Mesa in sunny California
949-631-7535 Cell 714-420-7535

Check out my electronic schematics site at: http://www.schematicsforfree.com
If you are into cars check out www.roadsters.com

 

Hi Martin,

does anyone know where I can buy a SLD with approx. 3 mW optical
output? Waveleght should be arroud 675 mW.


I found IR types on the web - but no visible ones. Any ideas?

Hello Frank,

no problem, really. "Ultrabright" GaAlAs LEDs typically emit around 660
nm (not mW ;-) and drop about 1.8 V. At 20 mA this means 36 mW. So you
require about 8% quantum efficiency.

Sorry, but I belive there was a missunderstanding. I am looking for
Superluminesence-Diodes which are (simplified)constructions of a LED
mounted next to a "laser" structur for amplifing light power without
receiving coherence.

The part you mentioned is a "normal" LED.


But thanks for your effort.


Regards,

Frank

 

[E Draisma]

Dear all,

First of all I tried the simplest approach suggested by some of you:
.. ___ Imax
.. 8-10V o-------|___|------o------>-----o ~1.4V
.. R |
.. |
.. |
.. V 1N4001
.. -
.. |
.. |
.. V 1N4001
.. -
.. |
.. |
.. ===
.. GND

This didn't work; the 8-10V power supply also stepped down to approx 2V. As
a result the amplifier connected to the MP3 player (and to the same power
supply) stopped working.
Next I tried the LM317 (see below & see attachment) This seemed to work as
it gave me 1,5V.

THE PROBLEM: (See figure 1) When the MP3 player is powered by the LM317
(instead of AAA battery) I hear a lot of noise; I guess it must be ripple
(?) amplified by the amplifier.
I then tried figure 2, but still there was a lot of noise.
QUESTION: does anyone of you know how I should get rid of the noise?

Thanks again!
Eibert




**My 1st Question was**: For an art project I need to build a small 1,5V
power supply to power a

small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC. I know a little bit about electronics, enough to
build a simple schematic

Use the LM317 adjustable regulator. Connect two 470 ohm resistors in
parallel (235 ohms) from output pin to the adjust pin, and a 47 ohm
resistor from adjust pin to ground. Or use a 100 ohm trimmer pot
instead of the 47 ohm to give you some adjustment. With the pot, the
lowest you can go is 1.2VDC, and the highest less than 2V, maybe 1.8V.
If the current is high, then mount the LM317 to a heatsink.