audio recording on IC -help wanted

[Watson A.Name - 'Watt Sun]

In article <hCQOa.130$0w6.14610@newsfep1-win.server.ntli.net>,
rogerspamignored@ttelmah.demon.co.uk mentioned...

"Lewin A.R.W. Edwards" <larwe@larwe.com> wrote in message
news:608b6569.0307081038.33e5efd8@posting.google.com...
casing. So I need to build a small cable with an RJ45M on one end and
a single panel-mount RJ45F on the other, to bring the Ethernet up to
the connector panel.

So far all I have found is connectors that are intended for wall-plate
mounting, and they're all too big to fit our connector area. Changing
the dimensions of that surface would mean changing almost every
dimension of the housing, unfortunately.
There are some 'slimline' designs of these. AMP do a version coded LJ6C,
which is only 25*38.5*19.2mm deep. These would probably be the most
readily
available solution. These 'snap in', to an aperture 26.5*22mm, which is
normally pretty easy to provide on a panel.

I spent some time browsing AMP's site before posting, and I think I
might have found the part you're talking about (is it in the
NETCONNECT series?) The document I downloaded was for the "SL Series
110Connect Category 5E Jacks".
The specific part was 1375191-X (X = color code) but nobody sells this
part (Mouser, Digi-Key, Newark). I'm not sure that this part will fit,
but it's the closest I've been able to find and I wanted to get a
sample at least. Searching for LJ6C didn't get me anywhere on AMP's
site (no surprise there), or the distris.

What I was really looking for was a connector with the same outline as
a 90 degree PCB mount style connector, but with "ears" on either side,
either a metal plate or a wider body with screw holes in it.

Harting, do a module rather like this, but it actually comprises a
plate,
with a 'snap in' connector built in (similar to the one above), so ends
up
being bulkier...

I think I saw something similar in my searches. That's the module
that's intended to fit in the same space as an XLR jack, isn't it?

Thanks for the response, in any case..
My part numbers are from a UK distributor, who seems to find LJ6C, with no
problem. It sounds like the one you describe. Harting do a 'range' of
plates, including ones to go into several different shaped holes, but they
all add bulk... Been thinking on (and back about sockets I have used), and
remembered that Krone, do a socket in their RJ-K series, with 'modular
mounting', which includes as one of the mounting options, a alloy 'block',
with holes into the sides (but not into a faceplate), which might be
modifiable to suit. Unfortunately, 'snap in', seems to be the standard, and
though these can be quite small, if you are prepared to make the hole in
your faceplate, it is not as simple as the 'bolt on' solution if you are not
in a position to get holes accurately machined, or the plate is a different
thickness.

Good Luck

I've used the AMP 110connect jacks at work, and they require the
special faceplate. The common 'keystone' jacks are sort of a generic
industry standard, and might be similar. All kinds of Cat5 jacks are
available thru Graybar and Anixter worldwide.

I use a lot of AT&T/Lucent/Avaya jacks, which are snap-in. You can
get the Avaya patch panels that are just a metal plate with square
holes cut out, and a bag of snap-in plastic inserts that hold the
regular faceplate jacks. You should get the newer jacks that are
rated for Cat5E.


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[Lewin A.R.W. Edwards]

modifiable to suit. Unfortunately, 'snap in', seems to be the standard, and
though these can be quite small, if you are prepared to make the hole in
your faceplate, it is not as simple as the 'bolt on' solution if you are not
in a position to get holes accurately machined, or the plate is a different
thickness.

Our housing's connector holes are laser-cut to very close tolerances,
and we could choose almost any gauge of steel we want for that panel,
but the problem is that this particular facet of the casing is only a
few millimeters taller than the aperture for a rear-mounted RJ45. I
think what I want to do is impossible, since apparently nobody makes
exactly the connector I want If I were to make that panel higher,
it changes the entire shape of the external housing, and we are
strenuously avoiding that.

(History: The shipping version of this product uses an SBC snuggled up
to the edge of the housing in that location. We are changing SBCs to
get a faster CPU, and the heatsink precludes mounting the new SBC
where the old one fits. So we are mounting it towards the center of
the chassis, and running a cable up to the edge where the connector
panel lives).

The only things we need to bring to the back panel are 2xUSB, 1xRJ45
and an audio jack, so I've ordered suitable parts to make a small PCB
and we'll try to see if we can fit all that together.

 

[Roger Hamlett]

"Lewin A.R.W. Edwards" <larwe@larwe.com> wrote in message
news:608b6569.0307090525.675aa9d1@posting.google.com...

modifiable to suit. Unfortunately, 'snap in', seems to be the standard,
and
though these can be quite small, if you are prepared to make the hole in
your faceplate, it is not as simple as the 'bolt on' solution if you are
not
in a position to get holes accurately machined, or the plate is a
different
thickness.

Our housing's connector holes are laser-cut to very close tolerances,
and we could choose almost any gauge of steel we want for that panel,
but the problem is that this particular facet of the casing is only a
few millimeters taller than the aperture for a rear-mounted RJ45. I
think what I want to do is impossible, since apparently nobody makes
exactly the connector I want If I were to make that panel higher,
it changes the entire shape of the external housing, and we are
strenuously avoiding that.

(History: The shipping version of this product uses an SBC snuggled up
to the edge of the housing in that location. We are changing SBCs to
get a faster CPU, and the heatsink precludes mounting the new SBC
where the old one fits. So we are mounting it towards the center of
the chassis, and running a cable up to the edge where the connector
panel lives).

The only things we need to bring to the back panel are 2xUSB, 1xRJ45
and an audio jack, so I've ordered suitable parts to make a small PCB
and we'll try to see if we can fit all that together.
OK. So it is the height of the socket, rather than the overall dimensions

that is the 'critical factor'. Brand-Rex, might do something that helps.
They do a socket, which snaps into a 14.9mm wide, by 20mm high hole, and has
overall dimensions 21.25mm deep behind the panel, and is 20.5mm wide, by
20mm high (plus about 1mm top and bottom in front of the panel from the
snap-in lugs. It is their part number C6CJAKU012. I had been 'trying' for
designs that were shallow, rather than ones that were small top-bottom. A
PCB, with a normal connector, is probably going to end up as deep.

Good Luck

 

[Lizard Blizzard]

N. Thornton wrote:

"Dr. Rev. Chuck, M.D. P.A." <cdub@_REMOVETHIS_erols.com> wrote in message news:<3F0954BD.6F0A@_REMOVETHIS_erols.com>...

Don Bruder wrote:

In article <3F0890F1.2430FD27@wi.rr.com>,
Mike Sawalski <msawalski@wi.rr.com> wrote:


Found an old electronics hobby article about an experiment that I would
like to try. It involves creating an electromagnet using some magnet
wire around a Bakelite spool. I know that they don't use Bakelite
anymore, and am wondering what the appropriate substitute material (not
plywood) might be?


Hi

Bakelite is in widespread use in the British electrical industry
today, it is what most (white) mains plugs are made from.

Regards, NT

Aw, c'mon! If it's not an ugly brown, then it's not bakelite! (Just
kidding) BTW there's an interesting story behind the guy who invented
Bakelite, Leo Baekeland. See URLs:
http://inventors.about.com/library/inventors/blbakerlite.htm
and here's another even better list of plastics etc, even Silly Putty!
http://inventors.about.com/library/inventors/blplastic.htm

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so I had to buy them again.
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FOR SALE: Nice parachute: never opened - used once.

F
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[Dimirtij Klingbeil]

hot_sosage@yahoo.com wrote:

Why don't you use 2 elcos double capacity and put them back to back:
-- --
_____||__||___
|| ||
-- --
- ++ -
It will give you nonpolrised capacity with double voltage rating.
^^^^^^

With SINGLE voltage rating. Don't forget that an elco is pretty conductive
when set up in the wrong direction, so the V will be at the second one.

P.S. If you don't believe that it is conductive and try this out, make sure
not to get shot by an exploding elco.

 

[Sřren A.Mřller]

In article <20a02d3.0306181754.6a5ff01c@posting.google.com>, willykk@my-
deja.com says...

Hi!

I am searching for an inverter/driver for an EL backlight of a Fujitsu
(HD44780) 20x2 LCD display, that can be powered by +5v.

What is the less expensive ready-made component available?. Is it
possible to make my own inverter? any plans out there?

IMP ( www.impweb.com ) and Supertex ( www.supertex.com ) makes some nice
chips for EL backlights.


Sřren A.Mřller

 

[N. Thornton]

Lizard Blizzard <NOSPAM@rsccd.org> wrote in message news:<behaik$39ca3$1@hades.csu.net>...

N. Thornton wrote:

Bakelite is in widespread use in the British electrical industry
today, it is what most (white) mains plugs are made from.

Aw, c'mon! If it's not an ugly brown, then it's not bakelite! (Just
kidding)

If you want to fake bakelite, Vauxhall Brazil Brown is a good colour
match.

BTW there's an interesting story behind the guy who invented
Bakelite, Leo Baekeland. See URLs:
http://inventors.about.com/library/inventors/blbakerlite.htm

Yup, if inaccurate. Bakelite was not the first plastic, but I'm damned
if I can remember the name of it... the first one was mainly used to
make billiard balls, and believe it or not it was explosive! So when
one ball was slammed into another there'd be a BANG.... there are
newspaper reports from the time of some guy who bought these much
cheaper plastic balls only to find his customers would all draw their
guns every time a match was played! Too funny.

Still cant remember the name tho... I guess the plastics industry has
never had a good name huh.

Regards, NT

 

[Pieter Hoeben]

On 9 Jul 2003 23:12:51 -0700, thushi@ee.pdn.ac.lk (thushi) wrote:

I have to interface Philips TEA5757 with any one of microcontroller.
It has three wire bus
I should send and receive 25 bits data. Please help me to configure
Serial port.
thushi@ee.pdn.ac.lk

Hi, You must clock it in/out using the digital i/o lines of your
processor (or i/o). |It is easy to build in formware, using any
processor. I think you must first look at what you want to do with
it. I have made many of those things, but not with
exactly this part. Contact me if you want more info,

Regards,

Pieter Hoeben
pieter@hoeben.com

 

[Dave Platt]

In article <a7076635.0307100437.77c8bd07@posting.google.com>,
N. Thornton <bigcat@meeow.co.uk> wrote:

Yup, if inaccurate. Bakelite was not the first plastic, but I'm damned
if I can remember the name of it... the first one was mainly used to
make billiard balls, and believe it or not it was explosive!

I believe you're referring to nitrocellulose. In some formulations
it's a pretty tough plastic, in others it's an unstable explosive.
Used to be used for playing cards and motion-picture film stock as
well as for billiard balls.

I remember reading a bit in a Ripley's Believe It Or Not collection
many years ago, about a prisoner in France (I think?) back a century
or so, awaiting execution, who decided to cheat the executioner out of
spite. He requested a set of playing cards (which he knew were
nitrocellulose-based), shredded them up, stuffed them into a hunk of
metal pipe he tore out of the cot in his cell, plugged the ends with
lengths of broom handle, and heated the pipe over a candle while
leaning right next to it. After a few minutes, KABOOM! He was just
as dead, of course, but chose suicide over execution.

Might have actually happened, might just be a story.

The use of nitrocellulose-based film stock has been a real problem for
Hollywood film archivists. A lot of the films made in the very early
days of the motion-picture industry were made on this stuff... it's
deteriorated in storage to the point where it's very difficult to
play, and also quite unstable. I believe there have been some
significant incidents involving severe fires (dunno about explosions
but it doesn't seem unlikely).

--
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!

 

[Peter Bennett]

On 10 Jul 2003 09:31:16 -0700, engelburt@beer.com (Chris) wrote:

Hi all

I'm trying to find some connectors the same as those used on the leads
from the front panel of a PC (i.e. the reset switch, leds, atx power
on), it's the small 2.54mm pitch (crimp housing?) connectors which fit
on to the motherboard headers. I thought it would be a simple quick
search but so far no luck.

AMP (now part of Tyco) makes them in their AMPModu (and other) series.

Digikey also shows some from Molex.



--
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GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

 

[Clifford Heath]

Dave Platt wrote:

I believe you're referring to nitrocellulose.

Originally, rayon was heavily nitrated cotton (60-80% nitrocellulose),
until the British gov't reduced the maximum allowable nitration to
sth like 15% after a girl was immolated by the touch of a cigar at a
dance. Rayon lost its characteristic rustle, and with it, its cachet.

 

[Watson A.Name - 'Watt Sun]

In article <1057880217.809122@excalibur.osa.com.au>,
cjh_nospam@managesoft.com mentioned...

Dave Platt wrote:
I believe you're referring to nitrocellulose.

Originally, rayon was heavily nitrated cotton (60-80% nitrocellulose),
until the British gov't reduced the maximum allowable nitration to
sth like 15% after a girl was immolated by the touch of a cigar at a
dance. Rayon lost its characteristic rustle, and with it, its cachet.

A short history of mnanufactured fibers makes no mention of this.
http://inventors.about.com/gi/dynamic/offsite.htm?site=http://www.fibe
rsource.com/f%2Dtutor/history.htm

As far as I know, cotton is much more flammable than synthetic fibers.

BTW, my dictionary defines immolation as offering in sacrifice. It
says nothing about the method used for making that sacrifice.


--
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[Dr. Rev. Chuck, M.D. P.A.]

Dave Platt wrote:

In article <a7076635.0307100437.77c8bd07@posting.google.com>,
N. Thornton <bigcat@meeow.co.uk> wrote:

Yup, if inaccurate. Bakelite was not the first plastic, but I'm damned
if I can remember the name of it... the first one was mainly used to
make billiard balls, and believe it or not it was explosive!

I believe you're referring to nitrocellulose. In some formulations
it's a pretty tough plastic, in others it's an unstable explosive.
Used to be used for playing cards and motion-picture film stock as
well as for billiard balls.

Still used as the major resin in wood lacquers. Flexibility makes it
superior to acrylic resins, since wood expands and contracts with changes
in humidity.

 

[Chris]

Peter Bennett <peterbb@interchange.ubc.ca> wrote in message news:<9lirgv8qjoc35b17n85lvbmlbfth1298lv@4ax.com>...

On 10 Jul 2003 09:31:16 -0700, engelburt@beer.com (Chris) wrote:

Hi all

I'm trying to find some connectors the same as those used on the leads
from the front panel of a PC (i.e. the reset switch, leds, atx power
on), it's the small 2.54mm pitch (crimp housing?) connectors which fit
on to the motherboard headers. I thought it would be a simple quick
search but so far no luck.




AMP (now part of Tyco) makes them in their AMPModu (and other) series.

Digikey also shows some from Molex.

Thanks for the response, I probably should have mentioned that I am in
the U.K. but at least I know what I'm looking for now.

regards
Chris.

 

[Roger Hamlett]

"Niall Smart" <niall@pobox.com> wrote in message
news:ae7f5645.0307110601.123e840@posting.google.com...

Hi,

I want to make up a custom length SCART lead, I have found some good
quality cable, but all the connectors I have seen are the cheap
plastic type. Does anyone know of a source for a good quality cast
metal SCART connector?
TCI.

QED, do their 'SQART' range of cables with this type of plug (and really
good wires), which are sold by a lot of the 'hi-fi' suppliers.

Best Wishes

 

[Kevin G. Rhoads]

I know that they don't use Bakelite
anymore,

Bakelite powder can still be obtained. The problem will be
getting moulds and moulding equipment to press it while baking
it. But the supply houses for metallurgical preparation have
Bakelite powder for sale. It is used for casting sample
holders around metal shards or pieces as the first step in
the preparation for metalurgical analysis. (?sp) Buehler
is one supplier. They also sell moulds and moulding equipement,
primarily for casing 1" diameter cylinders of arbitrary height.

 

[Spehro Pefhany]

On Fri, 11 Jul 2003 10:49:35 -0400, the renowned "Kevin G. Rhoads"
<Kevin.Rhoads@Dartmouth.edu> wrote:

I know that they don't use Bakelite
anymore,

Bakelite powder can still be obtained. The problem will be
getting moulds and moulding equipment to press it while baking
it. But the supply houses for metallurgical preparation have
Bakelite powder for sale. It is used for casting sample
holders around metal shards or pieces as the first step in
the preparation for metalurgical analysis. (?sp) Buehler
is one supplier. They also sell moulds and moulding equipement,
primarily for casing 1" diameter cylinders of arbitrary height.

Bakelite (phenolic resin) is still used in HUGE quantity for
inexpensive high temperature moldings, although some other expensive
engineering [thermo]plastics such as the liquid crystal polymers and
polyimides can now compete on performance.

It's a thermoset resin and is compression molded rather than injection
molded. Appliance parts (electrical and thermal insulating parts such
as plug bodies and handles), electrical and automotive parts such as
distributor caps are typical applications. The machine I've seen used
slugs of powder compressed into a highly polished mold at rather high
temperature.

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

 

[N. Thornton]

"Kevin G. Rhoads" <Kevin.Rhoads@Dartmouth.edu> wrote in message news:<3F0ECE7F.77489938@Dartmouth.edu>...

I know that they don't use Bakelite
anymore,

Bakelite powder can still be obtained. The problem will be
getting moulds and moulding equipment to press it while baking
it. But the supply houses for metallurgical preparation have
Bakelite powder for sale. It is used for casting sample
holders around metal shards or pieces as the first step in
the preparation for metalurgical analysis. (?sp) Buehler
is one supplier. They also sell moulds and moulding equipement,
primarily for casing 1" diameter cylinders of arbitrary height.

Dont underestimate this one - When Ekco made radio cases from bakelite
they used a press delivering over 100 tons of force to get that powder
squished together. Bakelite is also thermoset not thermoplastic.
Making things that way will not be easy, unless theres some clever
trick I dont know of.

Bakelite was developed as a substitute for shellac, shellac is way
easier to use! And easy to get hold of too.

Regards, NT

 

[Dave]

Try an LM3914N as a driver.

dave@horizoncomputing.ca

Daphne Martindell wrote:

I tried both digikey.com and radioshack.com and neither
carry this ~obsolete part anymore, Where can I buy this
part,or is there a replacement?

thanks,
-steve martindell

 

[Mark (UK)]

Hiya!

I've had an LM3909 with one LED connected to a D size duracell since Feb
1995 (I dated it!), and it's still going!!!! That was the beauty of the
3909, such a low current draw.

Yours, Mark.

"Watson A.Name - 'Watt Sun'" wrote:

In article <3F0F34B2.AF96CAC3@execulink.com>, horizone@execulink.com
mentioned...
Try an LM3914N as a driver.

Where'd you ever get the idea that that part number is even close to
the 3909? Besides, a two transistor flasher circuit will do the same
thing.

dave@horizoncomputing.ca

Daphne Martindell wrote:

I tried both digikey.com and radioshack.com and neither
carry this ~obsolete part anymore, Where can I buy this
part,or is there a replacement?

thanks,
-steve martindell

--
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###Got a Question about ELECTRONICS? Check HERE First:###
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goes directly to the trash unless you add NOSPAM in the
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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@@