MessageView 421F schematic

[Dan Rae]

SN74H52N

gcd wrote:

Hi,
lookI'm ing for the generic 74 series IC number for an HP 1820-0379. I Don't
have any cross refernces or hp bench briefs to refer to.

 

[gcd]

Thanks Dan,

Greg

"Dan Rae" <rae4@ix.netcom.com> wrote in message
news:sYKSc.18474$9Y6.10369@newsread1.news.pas.earthlink.net...

SN74H52N

gcd wrote:
Hi,
lookI'm ing for the generic 74 series IC number for an HP 1820-0379. I
Don't
have any cross refernces or hp bench briefs to refer to.

 

[gcd]

Thanks Dan,

Greg
"Dan Rae" <rae4@ix.netcom.com> wrote in message
news:sYKSc.18474$9Y6.10369@newsread1.news.pas.earthlink.net...

SN74H52N

gcd wrote:
Hi,
lookI'm ing for the generic 74 series IC number for an HP 1820-0379. I
Don't
have any cross refernces or hp bench briefs to refer to.

 

[Glenn Elmore]

Richard/Greg/Franc,

Would you be interested in a list of HP application notes? I may also be
able to help with part number cross reference. Drop me a note if you want.

Glenn Elmore

n6gnX@XsonicX.Xnet
drop the "X's"


Richard Freeman wrote:

Greg / Franc
I have been editing the List you sent over and it looks like the three of us
have essentially been working at the same thing in Parallel which is
probably not making efficent use of the resources available so the way I see
it there are a couple of options :

 

[Robert Baer]

martinbradly@ed.shawcable.net wrote:

Osama wa photographed here cutting a young childs head off, these pictures were discovered early last week and posted here yesterday
http://sabine.angelboy.us

....and, of course, this is *after* he hung himself!

 

[Manika Prasad]

Hello Friends and Colleagues,

We are organizing the next Acoustical Imaging conference in San
Diego in 2005 and would like to invite your group to particiapte. The URL
for the meeting is: http://www.ryalsmeet.com/meetings/UCSD032105/main.htm

This is a great conference for people involved in acoustics from all over
the spectrum. You can present you work on acoustics at any and all scales:
from nanometer to km.

Best wishes,
Manika Prasad
********************************************************************
Manika Prasad Tel.: (650) 723-8547
Geophysics Department OR (650) 723-0166 (lab)
397 Panama Mall Fax: (650) 723-1188
Stanford University email: manika.prasad@stanford.edu
Stanford, CA 94305-2215
URL: http://pangea.stanford.edu/~manika/manika.html
********************************************************************

 

[ken]

Does anyone have a schematic or know where I can get one for an AB
MessageView 421F Thanks for any help, Ken

 

[Tim Shoppa]

"Norm Dresner" <ndrez@att.net> wrote in message news:<JmC8d.492391$OB3.221474@bgtnsc05-news.ops.worldnet.att.net>...

I'd like to create a circuit for which I seem to only be able to get a
16-pin SOIC package. Since everything else I do is DIP-based, it seems that
what I'd want is an adapter -- ideally a socket so I don't have to do any
SIOC soldering. I think I found one but it's in the $70-130 range *each*.

SOIC sockets are for programming parts and then soldering them, not for
socketing them on the board because you're afraid of soldering them. This
explains their high prices.

Dead-bug style construction with SOIC's is perfectly feasible. After all
the lead spacing is only 0.050 inches, which is just the same as a TO-92,
and you do those all the time, right?

Tim.

 

[nospam]

"Clarence" <no@No.com> wrote:

"Rich Webb" <bbew.ar@mapson.nozirev.ten> wrote in message
news:nb39m090c2ut5o8q76gojj3s4p5a11aob0@4ax.com...
On Wed, 06 Oct 2004 19:04:09 GMT, "Nicholas O. Lindan" <see@sig.com
wrote:

"Tim Shoppa" <shoppa@trailing-edge.com> wrote

Dead-bug style construction with SOIC's is perfectly feasible. After all
the lead spacing is only 0.050 inches, which is just the same as a TO-92,
and you do those all the time, right?

If you are terminally myopic and have not a caffeinated neuron in your body:
http://elm-chan.org/docs/wire/wiring_e.html

Wow... those are lovely.
--
Rich Webb Norfolk, VA

Vero Corp used to sell wiring pens. I got two I use for different size wire.
The tip is a problem though, and I like the idea of putting a drafting pen tip
on the barrel. You can't get the little wire combs anymore, so I use 4lb.
Monofilament fishing line to "stitch" the wires on the board when I am done
wiring and testing.

I used to sew with that wire, you can get 500g rolls cheap, slightly
heavier gauge is better for sewing.

On vero board leave two holes for each pin, all wiring is on the component
side. Thread a couple of feet on a needle, go down one hole and up the
other for each node in a net. At the end of a net leave a loop on the
component side and start the next net. When you run out of wire solder all
the nodes then break off the between net loops with tweezers.

Very fast.

 

[Tim Shoppa]

"Nicholas O. Lindan" <see@sig.com> wrote in message news:<JkX8d.10093$gs1.9072@newsread2.news.atl.earthlink.net>...

If you are terminally myopic and have not a caffeinated neuron in your body:

http://elm-chan.org/docs/wire/wiring_e.html

Very impressive. Looks a lot like professional (machine-done)
"Multi-Wire" before being conformal-coated. Actually it looks better
than the Multi-Wire boards I've seen because you're working at like
one-fourth the pitch.

Tim.

 

[Spehro Pefhany]

On 7 Oct 2004 06:07:15 -0700, the renowned shoppa@trailing-edge.com
(Tim Shoppa) wrote:

"Nicholas O. Lindan" <see@sig.com> wrote in message news:<JkX8d.10093$gs1.9072@newsread2.news.atl.earthlink.net>...
If you are terminally myopic and have not a caffeinated neuron in your body:

http://elm-chan.org/docs/wire/wiring_e.html

Very impressive. Looks a lot like professional (machine-done)
"Multi-Wire" before being conformal-coated. Actually it looks better
than the Multi-Wire boards I've seen because you're working at like
one-fourth the pitch.

Tim.

It looks absolutely insane to me. Especially the TSSOP and the
fine-pitch connector. But thanks for sharing your methods.


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

 

[Mike Harrison]

On Fri, 5 Nov 2004 14:51:57 -0000, "Tony" <auct1@pantsaah-haa.com> wrote:

"wylbur37" <wylbur37nospam@yahoo.com> wrote in message
news:8028c236.0411050509.287d0f5f@posting.google.com...
I have an Epson 740 inkjet printer.

After not using it for a while, I discovered that the inkjet nozzles
were apparently clogged to the point where the "head cleaning routine"
was of limited usefulness.

A solvent for dye based inks is commonly used. Windex (Windolene UK) is a
window cleaning fluid which disperses encrusted or dried ink: Some of the
newer shower dispersant cleaners work equally well.
Firstly try a few drops on the docking sponge area which is where the heads
sit when parked.
Whipping out the mains plug in mid flight will expose this.
With a cotton bud introcude a few droplets on the piercing splines and the
sponge.
In real determined blockage cases - fill a spent cartridge with the solvent
(Household ammonia 10:1 works as well) and print a few windy pages . Letting
it sit overnight can also ease it further.
The so called cleaning cycle is really priming of ink through the feeder
tubes and seldom cleans.

...although it does actually try to actively suck ink out from the face of the head - there's a neat
little peristaltic pump arrangement in there

 

[George Kerber]

Jim,
I cannot find any reference in the manual (and I have several generations)
that correlates cal step limit errors to specific circuit malfuction or
point of measurement that is out of spec. The only clues for CAL 09 from the
manual are that limit errors "are generally due to A or B sweeps, A or B
gates, or the measurements PAL" - this doen't help much since all of the
that seems to be working fine and only steps 2 & 3 have limit errors.
Regards,
George Kerber


"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns95A4C8F20A31jyanikkuanet@129.250.170.83...

and7@bigfoot.com (TekMan) wrote in
news:6a624601.0411170043.1055b6c@posting.google.com:

"George Kerber" <glkinst@earthlink.net> wrote in message
news:<QFomd.1654$pK6.793@newsread2.news.atl.earthlink.net>...
Andreas,
That is exactly what I did. The entire cal procedure has been
perfomed a couple of times. Still get "LIMIT" on CAL 09 steps 2 & 3.
Everything else passes and the scope appears to function normally,
except at startup it fails test 04 code 02 which means one or more
cal coefficients is out of limits. I assume this is from CAL 09 steps
2 & 3. George

..snippety..

George,
okay, when you can't complete by simply caloibrating:
this says that your scope can't be cal'd any more due to a hardware
problem on the board (most often input amp chips partly defective/out
of specs).

change these chips. But be warned: Spares are ahrd to get.

hth,
Andreas


Isn't there something in the service manual that relates the cal step to a
particular circuit area? ISTR that there was.

--
Jim Yanik
jyanik-at-kua.net

 

[Robert Baer]

Joaquin Bonilla wrote:

I have a question regarding ten cells of 1.2 V single cell nominal
voltage
NiMH and NiCd.

I have just NiMH batteries available. I know that the NiMH cells have
not
very good self-discharge rate.

After a complete battery charge the measured voltage become 14.4 V. In
a
couple of days or so, the voltage dropped down to 12.6 V decreasing
the
self-discharge rate notably. It made looks like a pseudo "steady
state" the
battery voltage.

I ignore physical details about NiMH to understand this peculiar
transition
on voltages. I could make a guess although I would like to understand
the
real reason.

I consider that the cells after the charge were forced to a voltage
higher than
the nominal. Then the cells use a higher than the "regular" self
discharge rate up to the reach its nominal voltage. At that point the
discharge rate would decrease to become "nominal" too.

Has anybody an answer about this voltage transition? Would be similar
for
NiCd cells?

Thank you in advance,

JB

As far as i know, almost all cells (primary and secondary) exhibit
this initial higher-than-nominal condition.
Mercury cells and Lithium cells appear to not have that pecular
attribute.

 

[Rolavine]

From: CJT abujlehc@prodigy.net
Date: 11/21/04 11:20 AM Pacific

Mistress wrote:
In article <O9ind.29061$jf4.1240181@phobos.telenet-ops.be>,
colin.watters@pandoraBOX.be says...

"Jerry G." <jerryg50@hotmail.com> wrote in message


Seimens is supposed to have these. The good ones are fairly expensive,
and they are all very limited in performance. Noise is very complex, and
all the situations are very random.


I had such high hopes when I saw ANC demonstrated with a wood chipper
several years ago. I thought this technology was "right around the corner."

My fondest dream -- I want one inside my PC case. The fan noise is making
me crazy, hour-after-hour, day-after-day.

Power consumption, the associated heat, and hence the associated fan
noise are three aspects of the same problem which is the bane of PCs.

Time for a fluid cooled computer with an outdoor radiator, I proposed such a

device as a project for an outfit I worked for 1985.

But the bane of PC's is not noise, It's Windows. I swear they wrote all the
versions so far for the benefit of makers of spywear and viruses. Then they fix
it with add ons, but they make your system crash, lol.

A day without cursing Microsoft is like a day without sunshine.

But can't you noise cancel the fan by putting an identical one over it, blowing
the other way, ha!

Rocky

 

[John Fields]

On Tue, 30 Nov 2004 09:57:36 -0500, "Ronak Shah"
<ronaksh@nortelnetworks.com> wrote:

This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes in
glass case too...
Is there a way I can find out what this is and what values it holds....

Are there stripes around the bodies of the devices?

--
John Fields

 

[Ronak Shah]

you can hardly see the stripes.... they are more like blogs of ink
"John Fields" <jfields@austininstruments.com> wrote in message
news:ne4pq05bp81s19jm18j0pk1pig3ej47cjt@4ax.com...

On Tue, 30 Nov 2004 09:57:36 -0500, "Ronak Shah"
ronaksh@nortelnetworks.com> wrote:

This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes
in
glass case too...
Is there a way I can find out what this is and what values it holds....

Are there stripes around the bodies of the devices?

--
John Fields

 

[John Popelish]

Ronak Shah wrote:

I took some advice and got my self the magnifying glass....
well I can see the following digits....
on the first one
1N8
14B
C

on the second one:
TFK
1N4 < Not very clear
733 < 7 is clear the rest I guessed from the blur

Now I cant see the numbers clearly.. so I am guessing these numbers... does
anyone recognize these?????
If you do... are these zeners or regular signal diodes??
If not do these numbers resemble anything you might recognize ?

I am kinda new to this.....please advice

This might be useful:
http://www.brive.unilim.fr/geii/electronique/docs/cross_ref_puissance.pdf

This list may give you an equivalent type that you can find on Google.

That said, the second one is a current type and is on this data sheet:
http://www.fairchildsemi.com/ds/1N/1N4744A.pdf

--
John Popelish

 

[Robert Baer]

Ronak Shah wrote:

well I have a couple of these mystery devices.. they look like capacitors..
but not sure if they are...
They have no marking on them except on the top that says:
LJ
410
any clues on what they are?
how cold I check?

[Image]

[Image]

[Image]

1) I do not think it is a good idea to include binaries )pictures) on
this NG.
2) My guess is that they are inductors.
Use a VOM or DVM and check for continuity on low ohms scale first.
If it reads "short" then the guess of an inductor becomes a sure bet.
If not, then go to a high ohms range; reversing the leads may show a
low value increasing over time to an open.
The slower that increase, the larger the value of capacitance.
If that is the case, then look for a polarity indicator; a plus +
symbol OR a - symbol or line near one lead.

 

[Bob Masta]

On Tue, 30 Nov 2004 09:57:36 -0500, "Ronak Shah"
<ronaksh@nortelnetworks.com> wrote:

This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes in
glass case too...
Is there a way I can find out what this is and what values it holds....

A method I use is similar to Chris Foley's, only simpler if you have

a scope. Just put the unknown device in series with a resistor
(100K or so) and connect to the AC output of an appropriate
transformer.

Look at the voltage across the diode and see what it does.
You can see the Zener voltage as a clipped half-sine in
the reverse-bias direction. You can thus read the Zener voltage
right off the scope face. This makes it quick to characterize
lots of unknown parts, including telling which end is which.

Hope this helps!


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com