audio recording on IC -help wanted

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On Thu, 05 Jun 2008 06:36:33 -0400, JW <none@dev.nul> wrote:

On Tue, 03 Jun 2008 05:33:30 -0400 JW <none@dev.nul> wrote in Message id:
sp3a4458nqv40cu7tgjmd5i76cjdiv7f4n@4ax.com>:

On Mon, 2 Jun 2008 11:25:18 -0700 dplatt@radagast.org (Dave Platt) wrote
in Message id: <ehqdh5-spo.ln1@radagast.org>:

In article <n9g7445fdmof3nohavnt74eghlh02mb0je@4ax.com>,
JW <none@dev.nul> wrote:

I think I'll try option 2 with a U441. :)

Yeah... that's certainly the sensible thing to do, unless you find
that the device *really* needs very specific selection for various
parameters.

Now for my dumb/ignorant question: The schematic does not show source and
drain - how do I determine which is which when I replace the part?

For an N-JFET, the source goes towards the more negative voltage...
in this schematic, it looks as if the downward side would be the
lower-voltage side per the normal convention, and thus the drain's on
the top and the source is on the bottom.

JFETs tend to be fairly symmetrical, and will often work if you swap
the source and drain, but since the source/gate and drain/gate
capacitances may not be identical you should probably keep the part in
its preferred orientation.

Hello Dave,

Excellent. Many thanks for your help and valuable lesson. I've ordered the
part from Newark and will reply back and let you know how it went.


Well, got the device in and installed in the circuit. It was pretty close,
but I couldn't make it through the input stage balancing procedure on pg.
143 and 144 of the service manual:

http://www.keithley.com/data?asset=1062

I followed the procedure for setting jumper W303 (in my case position C
was required) and could only get the display to read about 18mV when
adjusting R314. So, I tweaked R351 a bit lower and managed to get it down
to 0.0mV when adjusting R314, but it wasn't stable - it would drift around
one or two millivolts or so.

At this point, I took a "known-good" instrument from stock, and verified
it's stability. I found it to be rock solid give or take ten microvolts or
so. I removed the JFET from the known-good unit and dropped it into the
unit I was repairing. I put R351 back to it's stock resistance of 16.5K.
This fixed the unit. Since the customer was getting (very) impatient and
my boss was willing to sacrifice our unit for the time being, I finished
calibrating it and shipped it off yesterday. Of course, now *our*
"known-good" needs a replacement Q308 dual JFET. :(

Does anyone have any other possible subs I could try?
Click to expand...
The U411 wasn't specified for low gate leakage (~200pA), and may be in
the wrong package (TO71 - 6pin TO18) to provide this. Most of the
low-leakage duals ( 1 to 5 pA) are in the larger TO78 (6pin TO5) case
sizes.

U421 through U428 are all below 5pA. If you move to the smaller can
size, the lreakage pec automatically increases by a factor of 5.

For a static match less than 25mV, you'd be restricted to U421/2/5/6.

The jedec low-leakage types are 2N5902-2N5909 inclusive (2 to 5pA),
all below 15mV match.

RL
 
On Jun 5, 12:52 pm, Ron Hock <nos...@www.hocktools.com> wrote:
Guv Bob wrote:

[much snippage]

Boycott McMaster-Carr

Boycott? On your demand? I don't think so. I certainly hope you sent
your comments directly to them, and waited for a reply, before going to
the newsgroups with them.

Perhaps your local branch is having personnel problems but I've bought
from McM-C for over 30 years and have always found them to be friendly,
efficient and prompt. They're not a bargain house but their prices are
fair, I receive my order next day and if they don't have it, well, good
luck finding it anywhere.

--
Ron Hock
HOCK TOOLS  www.hocktools.com
Click to expand...
Just received 2 tubes of DOW RTV-732, 2nd business day after I ordered
it online from McM-C at 9:00PM. Shipped in the morning and arrived the
next day.

Typical pattern for me - small orders, no hassle, prompt delivery.
 
On Thu, 05 Jun 2008 11:54:24 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Does anyone have a link or hint regarding shielded CAT-5 which is as
flexible as the better non-shielded patch cables?

Regular shielded is quite stiff. During EMC we discovered that a cable
inside a unit needs to be shielded and it has to go through a harness
that will be bent back and forth whenever a drawer mechanism opens. Not
every minute or so, just once in a while. It just can't be too stiff.
Click to expand...
Are you using solid CAT5 wire or stranded? The stranded is obviously
more flexible. Google shows lots of sources for CAT5e stranded STP
(shielded twisted pair).

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS
 
On Sat, 03 Jan 2009 04:41:13 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

"Floyd L. Davidson" wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
Stuart wrote:
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

I have never seen a transformer in ANY phone including the carbon mic
type which also 'draws power from the line' to power the mic as you say.

How do the clowns think they determine ON and OFF HOOK ?

Graham

Oh dear, you need educating.

http://www.telephonesuk.co.uk/images/232_cct.jpg

What do you think "Coil,Induction No20" is?

I'm afraid I wasn't around in 1935. 73 yr old technology is somewhat
irrelevant.

The definition of on/off hook supervision has not changed, and that
makes it exceedingly relevant.

These days a phone is a chip and a few passives (that *aren't* big inductors).

Not necessarily. Some do have transformers.

Such as ?
Click to expand...
Is it really so goddamned hard to accept the fact that such items do
exist?

Probably just as hard it is to accept the fact that you are a self
denying, US hating retard.
 
Hello,

I'm looking into writing a Linux driver for a USB video interface that
used to be
sold by Pinnacle and then Dazzle (DV150). The hardware is very simple
but I
am missing a crucial piece of information.
The video to MPEG conversion is done by a Cirrus Logic CS92288.
Cirrus
sold its video business to Magnum semiconductors which apparently
doesn't
have anything that looks similar to the Cirrus chip anymore.

Searches on the web only return the product brief that doesn't contain
any
usable information. Unfortunately, many web pages refer to this brief
as a
"datasheet". The searches also return information about a reference
design
that looks almost identical to the DV150 (interesting no?).

So, I'm looking for the following:

The CS92288 datasheet
The CS92288 programing manual (user's manual)
The user's manual of the USB-DVR reference design based on the CS92288

The best would be a copy of the CD that came with the reference design
hardware (that contains all of the above+software examples and other
goodies).

Thanks in advance for any type of help in locating this information.

-JMB
 
Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote in
news:bqj48356at0vcvc5drp2peu1d9836eesdg@4ax.com:

http://members.misty.com/don/bulb1.html
Click to expand...
That is such a good read :) I've seen bits of postings by him in the
LaserFAQ, but I never followed up enough to know how much good stuff he
wrote.
 
On 28 Dec 2008 00:07:02 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2008-12-27, Archimedes' Lever <OneBigLever@InfiniteSeries.Org> wrote:
On 26 Dec 2008 22:29:51 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2008-12-26, Archimedes' Lever <OneBigLever@InfiniteSeries.Org> wrote:
On Fri, 26 Dec 2008 09:35:14 -0500, Spehro Pefhany
speffSNIP@interlogDOTyou.knowwhat> wrote:

Gray is the Device 1, Secondary connector, pin 28 will be NC

Not true. It is NOT a "cable select" cable.

Why should anyone believe this claim of yours?

Look, fucktard... You STILL select 'master' or 'slave' when you install
a drive in a UDMA interface.

Hey Shit for brains, I never said any different.

That means that it is NOT 'cable select'.

this is where you are WRONG WRONG WRONG WRONG.
Click to expand...
You are full of shit.
Using a 'cable select' cable would REQUIRE that the drive be set to
'cable select' as well,

NO, never has, never will.
Click to expand...
You are a goddamned retard. Always has... always will.

the drive has to be set in a compatible mode with any other drives on
the cable, that is all.
Click to expand...
Wrong. When using 'cable select' feature, BOTH drives get set to cable
select, AND a MODIFIED 'cable select' cable MUST ALSO be used. In such
cables, the RIBBON gets holes punched in it and THAT is what detaches
certain pins on the assembly where the SAME CONNECTORS are used
throughout the ENTIRE INDUSTRY.

If you were any more clueless, you'd be named Roy!
 
JosephKK wrote:
On Thu, 05 Jun 2008 18:12:32 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Jeff Liebermann wrote:
On Thu, 05 Jun 2008 11:54:24 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Does anyone have a link or hint regarding shielded CAT-5 which is as
flexible as the better non-shielded patch cables?

Regular shielded is quite stiff. During EMC we discovered that a cable
inside a unit needs to be shielded and it has to go through a harness
that will be bent back and forth whenever a drawer mechanism opens. Not
every minute or so, just once in a while. It just can't be too stiff.
Are you using solid CAT5 wire or stranded? The stranded is obviously
more flexible. Google shows lots of sources for CAT5e stranded STP
(shielded twisted pair).

Thanks, Jeff. I didn't remember "STP". Dang, I think I am getting old
here ...

And single braided over shield is more flexible than any foil shield
version, maybe even 45 % coverage would pass and it is more flexible
than 95 % varieties.
Click to expand...
Well, so far I have only seen Foil shield. Do you remember a brand with
braided shield?

I did find dual-pair microphone cable which would work since LAN only
needs two pairs. But it won't be so easy to get a standard RJ jack
connected in production.

--
Regards, Joerg

http://www.analogconsultants.com/

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

Eeyore wrote:
Joerg wrote:
Does anyone have a link or hint regarding shielded CAT-5 which is as
flexible as the better non-shielded patch cables?

Regular shielded is quite stiff. During EMC we discovered that a cable
inside a unit needs to be shielded and it has to go through a harness
that will be bent back and forth whenever a drawer mechanism opens. Not
every minute or so, just once in a while. It just can't be too stiff.
My studio installation guy says he know just the stuff you need, it's about
as flexible as microphone cable.

He gets it fron Canford Audio in the UK, I haven't found the part number
though (their search engine is rubbish). He has something like 10-20 m on
hand if you only need to purchase a small length. You could pay him via
Paypal or whatever (that's cheapest).

Thanks, Graham. However, we'd need quite a bit more than that, it'll be
for production.

Meantime I did find some microphone cable that could work though. I was
surprised that they had dual twisted pairs.

If that's 'starquad' it's unsuitable. Totally different impedance.
Click to expand...
Ok, but it's only for a 30cm run each system, the rest would be CAT5 and
we don't have to run 1Gb/sec. Thing is, we don't have any music stores
around here where I could take a look. Well, you can buy a fiddle and a
twang box of course, along with the proper Stetson, saddle and boots.
But no fancy electric stuff. Since you are an audio guy: Is that Star
Quad really flexible?

--
Regards, Joerg

http://www.analogconsultants.com/

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

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Don Pearce wrote:

Also in the main living rooms I have tried CFLs and rejected them because the light
they give is just too unpleasant to live with.

Even with the current 'warm white' types ?


Yup. For me they have never felt warm - just dim. They put me in mind
of wartime and rationing.

Well, they *are* dimmer than conventional incandescents. I've always found the idea that
they use 1/5 the power misleading. Those comparisons were made with 'softone' bulbs.

You need at least a 23W CFL to match the output of a 100W incandescent.

The table here...
http://en.wikipedia.org/wiki/Incandescent_lamp#Power

Shows a 100W incandescent providing 1700 lumens.

In comparison some new CFLs I have claim only 1100 lumens for an 18W and 1200 lumens >for a
20W.

The 11W CFLs claim 600 lumens and that makes them only slightly brighter than a standard
40W bulb instead of equivalent to a 60W as claimed.

I do wish they wouldn't make these silly claims for them.


I noticed that from the start. They never stood up to the brightness
claims they made about them, but it isn't even just that. There is
something dingy in the quality of light that isn't fixed by going up
in power.
Click to expand...
It's some time since I did a side by side comparison. I shall do so again.

Graham
 
Eeyore wrote:
Joerg wrote:

Eeyore wrote:
Joerg wrote:
Eeyore wrote:
Joerg wrote:
Does anyone have a link or hint regarding shielded CAT-5 which is as
flexible as the better non-shielded patch cables?

Regular shielded is quite stiff. During EMC we discovered that a cable
inside a unit needs to be shielded and it has to go through a harness
that will be bent back and forth whenever a drawer mechanism opens. Not
every minute or so, just once in a while. It just can't be too stiff.
My studio installation guy says he know just the stuff you need, it's about
as flexible as microphone cable.

He gets it fron Canford Audio in the UK, I haven't found the part number
though (their search engine is rubbish). He has something like 10-20 m on
hand if you only need to purchase a small length. You could pay him via
Paypal or whatever (that's cheapest).

Thanks, Graham. However, we'd need quite a bit more than that, it'll be
for production.

Meantime I did find some microphone cable that could work though. I was
surprised that they had dual twisted pairs.
If that's 'starquad' it's unsuitable. Totally different impedance.

Ok, but it's only for a 30cm run each system, the rest would be CAT5 and
we don't have to run 1Gb/sec. Thing is, we don't have any music stores
around here where I could take a look. Well, you can buy a fiddle and a
twang box of course, along with the proper Stetson, saddle and boots.
But no fancy electric stuff. Since you are an audio guy: Is that Star
Quad really flexible?

Not to my knowledge it isn't. Never used the stuff though. In fact it's very rarely
used at all, just when required to 'ultra-eliminate' induced voltages into the mic
signal cables. There are two pair twists one going clockwise, one anti-clockwise
you see. You wire them in parallel and it should ALL cancel out.

This appears to be the Canford cable I mentioned.
http://www.canford.co.uk/commerce/item_31-860_22218.aspx
http://www.canford.co.uk/commerce/resources/catdetails/5285.pdf
Click to expand...
Hmm, that has the usual foil shield like the Belkin shielded CAT5.
Belkin is one of the more popular brands out here.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
 
Thanks for the suggestions. I ended up getting two of those mini
"tactile" button switches and gluing them one on top of the other. One
of then has a repeatably lower activation force than the other and
always closes first. The result is quite usable.

I did consider some sort of wire-or circuit, but it seems that when the
camera has gone to sleep only one of the pins has power on it, and it's
an odd voltage. Although it would probably be safe to short them
together, the camera was too expensive to take any riskes....

Cheers,

Phil.
 
Don Klipstein wrote:

Don Pearce wrote:

Currently, white LEDs are in fact blue LEDs coated with a fluorescent
substance, so probably the overall light quality will be quite similar
to CFL.

Actually, it's more like that of somewhere between a "cool white" and a
"daylight" old-fashioned fluorescent, with similar color distortions.
There are now some warmer white and higher color rendering index white
LEDs.
Click to expand...
I've yet to see a spectrum published for those 'white' leds. I assume it must be
similar to CFLs.

Graham
 
On Sat, 21 Feb 2009 13:04:11 -0800, the renowned Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Ok, took a printer (Brother MFC-7820N) apart because it fell silent,
found all voltages to be there, all crystal oscillators humming, but the
DRAM is never accessed. Big fat uC on there, says "Concordia Japan" and
the P/N is LJ9899001. No logo. The web shows the usual collection of
Asian sources but the datasheet links are always dry.

What company is that? I only know a Concordia university.

I am suspecting a reset because the POR/BOR has always been weak. This
doesn't surprise me anymore these days but my last ditch effort before
the printer goes lalaland would be to roach on my own reset circuit
(that has revived many electronic devices in the past).
Click to expand...
Don't know "Concordia".

Years ago, I had a very big, very expensive NEC laser printer that
died because the EEPROM failed-- it didn't get past the initialization
routines. Popped in a new 2816 or whatever it was, and it fired right
up.

They wanted something like $1500 at the time for a new controller
board, which was more-or-less what the printer was worth.



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
 
I have a ribbon cable and want to solder a single wire to all the
conductors.

This is a flatter ribbon cable than the sort of cable found in PCs for
for IDE drives. ISTR it may have come from a printer where it was
subject to a lot of movement.

I don't have any ancy equipment. Is it possible to solder onto the metal
in the conductors? Or is that metal made of aluminum or something like
it which is difficult to solder?
 
Sometimes you need some useful examples and schematics for reference,
circuit design and projects. You can found it from books but this is
not enough. Here is some useful links that provide various types of
schematics.

http://linkbee.com/BLQA - CXI Schematics
http://linkbee.com/BLQG - DiscoverCircuits free electronic circuit
http://linkbee.com/BLQH - Aaron's Homepage
http://linkbee.com/BLQI - Bowden'sHobbyCircuits

Sometimes you saw some electronics kits distributors online such as
Quasar Electronics and Kitsrus.com, they also provide the circuit
schematic, simply download their kits data sheet and refer their
schematic. Most of the schematic is the complete circuits, except the
programmer.

http://linkbee.com/BLQL - Quasar Electronics kits
http://linkbee.com/BLQM - Kitsrus.com
http://linkbee.com/BLQN - Electronics 123
 
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