audio recording on IC -help wanted

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[TT_Man]

Natural sunlight doesn't have significant content at or near 2537
angstroms,
or we'd all be blind.
I was involved with some tests on EEPROMs, many years ago (back in the
days when the 2716, was 'new' technology).
We had 32 test chips, and put them on the lab windowsill for six
months, without a single bit error.
However we also put another set out in direct sunlight. On these, two
had bit errors after 3 months, and at the end of the test, five showed
errors.
The difference,the glass in the lab windows.
Ordinary glass is quite opaque to the required frequency (253.7nm), so
it is unlikely that chips will get erased in normal room lighting, or
from daylight through windows, but if the unit is outdorrs, the Sun,
does have the energy to cause problems over a long period.

Best Wishes

Sorry to but in, but I had an 8748( onboard eprom) project back in the mid
70's..... worked fine on the bench, wouldn't run in the box..... I had to
put a 6.3V bulb, running at 5V over the widow to make the dam thing work.
Neither I nor Intel ever figured out why ....... strange but true!

 

Law enforcement is now intercepting text messages,
as proven by Operation Sudden Fall in San Diego.

http://www.usdoj.gov/dea/pubs/states/newsrel/sd050608.html
http://www.signonsandiego.com/news/education/20080506-1338-bn06sdsu2.html

Don't let your personal SMS/text messages fall into
the wrong hands. Encrypt your messages with one
of these:

http://www.CryptoSMS.org
http://www.CryptoSMS.com
http://www.FortressMail.net/fortress_sms.htm
http://www.Cop2p.com/encrypted_sms.html

Be Safe, Be Encrypted, Fuck the Police!!

--
Can doesn't Satam voice sooner?

 

[Jim]

I am the OP. I haven't encountered Mr On Web before but not only are is
remarks bizarre but they contain enough innuendo to make them offensive.


On 18 Jun 2007, Anusol Man <chris@tuftsandwhitton.co.uk> wrote:

you are bizarre

"On Web" <a@b.com> wrote in message
news:c79di.433$_l6.18@newsfe6-win.ntli.net...
"Jim" <nomail@riomail.com> wrote in message
news:Xns99526A09F520B5D4AM2@127.0.0.1...
I am in the UK.

Can I build a simple device which would switch a pair of contacts
on/off when my landline phone was being used.

Am thinking of something like this. There might be a simple reed
switch (do such things still exist) which would close its
contacts if there was a current on the phone line.

Perhaps I might need to improve the situation and wind the
landline (or maybe just one of the two wires) around the reed
switch.

Would something like this work?

Or can I buy a simple plug-in device for something like a fiver
which closes its contacts when the phone line is active?

What would you use this for?

At the moment I can only think of the obvious application: bugging
other peoples conversations, something I'd not be happy to assist
with..

 

[On Web]

"Jim" <nomail@riomail.com> wrote in message
news:Xns9953D32F1928C5D4AM2@127.0.0.1...

On 18 Jun 2007, On Web <a@b.com> wrote:

lots of snips..

What is it you are trying to do?

I am setting something up to ensure safety for someone in the
household who is suffering trauma and I do not feel I need to go into
the details.

Then I wish you luck with it, whatever it is. I can't help but feel that for
whatever your trying to accomplish there's a more direct route to the
solution, and no I don't want to know any more, I'm done with this.

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:468FA633.52502BD5@hotmail.com:

I bet you'll find that LED has a 7000K or so colour temp. They're not
very nice for domestic lighting.

True, I'm not wild about it, but so long as it can improve enough to avoid
sharp dips or peaks I don't mind some serious skew toward blue. We can get
used to it as we get used to changes in the colour of ambient daylight,
which is often close to what LED's already make. The sharper detail from
shortwave blues will help decrease fatigue and increase comfort when
reading or doing small-scale work. My only current beef with them is the
lack of nice rendering of reds. Adding some broadband red centred around
650 nm should fix that.

 

[EngineerEDGE]

Hello Guys,

I found an interesting website at www.calculatoredge.com an online
engineering calculator for formula and equations you can solve at
click of a button, If you like this website send links to your
friends and engineering group members.

Tom

 

[gearhead]

I have a circuit that calls for a constant current sink. The LM317
would be perfect, but it requires about 5 milliamps to operate. It's
too much for my battery-operated circuit to drain 5 mA all the time.
So I'm looking for a 1.2 volt three-terminal series regulator like the
LM317 that can run on lower current. 100 uA would fit the budget.
I remember a thread some time ago on sci.electronics.design where
somebody mentioned a three terminal negative regulator (pretty sure it
was Joerg) that can run on microamps. Might have actually been a 2.5
volt regulator, don't remember. I even remember looking up the
datasheet, but I can't remember the part number.
I spent some time slogging through the parametric parts search on
digikey but didn't find it. I came here to see if anybody knows the
part.

 

[sck0006]

Has anyone found binding posts that fit the GenRad 1432 Decades? The
holes in the panel are .625in, and all the standard sized posts I can
find are .5in. IETLabs doesn't sell them anymore. Any ideas?

Steve

 

[mw158979]

Hello,

Voltage references has usually specified a parameter
'temperature drift limit', e.g. 10ppm per Celsius degree.
What about long term issues related to this drift?
Can the drift go above that limit after years? If so,
how long period can I expect with drift as specified?

TIA

 

[Eric Smith]

Back in the early 1980s, there were some EPROM carriers that were
just a plastic piece that the EPROM leads were bent around, and sockets
for those that accepted the carrier (in an upsidedown configuration as
compared to how an EPROM would normally be inserted in a DIP socket).

I remember seeing those in a Digikey catalog years ago, but I don't
recall which vendor made them.

Anyhow, I'm looking for one 24-pin socket for such a carrier, and some
carriers (with EPROMs or without). There was a tool for crimping the
EPROM leads around the carrier, and it would be nice to get one of those
too.

And if anyone has the datasheets giving the mechanical drawing, that
would be very handy as well.

Thanks!
Eric

 

Windows XP tips and tricks. Learn how to bypass very common windows
problems, to speed up your system and make it more reliable with
useful tips and tricks.

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[volcko@juno.com]

I have a component I am trying to identify. It consists of a glass
tube about 3/4" long and 1/8" diameter. Inside this tube are 2 blades
that look like the might contact each other where they overlap
slightly. There is a wire coming in from either end into the glass
tube and the ends are fused shut(melted) The only markings on the
outside are as follows:
RS 338 147
Can anyone identify what this is?

Thanks,
BV

 

[Paul]

On Jan 15, 3:12 pm, "David L. Jones" <altz...@gmail.com> wrote:

"Paul" <energymo...@gmail.com> wrote in message

news:7f239414-f99c-48ad-90e2-c9b0d0db2424@l39g2000yqn.googlegroups.com...
On Jan 15, 2:19 pm, "David L. Jones" <altz...@gmail.com> wrote:

"Paul" <energymo...@gmail.com> wrote in message

news:54c2d7cf-c506-4647-b272-17d608c8854a@x8g2000yqk.googlegroups.com...

I'm testing a new DMM I purchased, AM-240 by Amprobe. It claims *over*
100Mohm impedance in 400.0mV mode.

Nothing new there, many DMM's have selectable "high impedance" or "HI-Z"
modes on the mV range. e.g. the Fluke 87.
I've looked at the specs of ~ 30 DMM's today, include a lot of
fluke's, and never seen anything near 14Gohms impedance. Keithley has
an electrometer that's probably higher. Most DMM's are around 10Mohms
(not gigaohms) input impedance.

The Agilent U1253A also has it. Spec is ">1Gohm".
There are quite a few meters I've seen over the years that have it too.
I think I even saw it on one of those $10 disposable meters too.

Dave.

I think the Agilent U1253A typically lists for $450. That's a bit more
expensive then the $40 AM240. Do you have model # for the $10 one?

PL

 

[Graham W]

hihihi wrote:

Hi..

I found some toroidal transformers.

http://home.wanadoo.nl/vroemm/temp/keen-ocean-toroidal-20070819-182034.png

There are small drops inside.
I opened one, got the drops on my fingers.
My fingers seem to be vaguely sticky afterward.
Is this water ?
Or do manufacturers put something inside what looks like water ?

If its water, any change this will dry enough to be safe again ?

Yes, it looks like water. The moisture has condensed on the clear tape
because its environment was cooler than inside the windings.

Put it in the oven after it has been used to roast the Sunday joint
but turn the heat to off. Leave it there until everything is back to
room temperature, say 4 hours. Don't have the oven too hot to
start with, say 85şC, or the insulation may suffer.

Where did you get the txfmr from?


--
--
Graham W http://www.gcw.org.uk/ XP1800+ Page added, Graphics Tutorial
WIMBORNE http://www.wessex-astro.org.uk/ Wessex Astro Society's Website
Dorset UK Info, Meeting Dates, Sites & Maps

 

[Roger Hamlett]

On Fri, 11 Jan 2008 17:44:39 -0800, Eric Smith <eric@brouhaha.com>
wrote:

Ian, do you have ANY evidence to back that claim re sunlight. AFAICT it is
urban legend, but tests we conducted - in a far sunnier climate than yours
;-) -
revealed not a single bit had changed in 2764's after a month in the
weather.

Should just be a matter of time, given photons as quanta. I couldn't do it
here, light not strong enough, but a less-than-annihilating focus with a
magnifier speeded it up enough to prove I could erase and re-write, so the
question is not whether unfiltered sunlight can do it, it's how long does it
take for a given strength.

It's not just the quantity of photons, but also their frequency, which is
why x-rays won't erase EPROMs. (Sufficient x-ray dose will damage the
part, though.)

The spec is 2537 angstroms, but I think that was selected by Intel because
it was the nominal wavelength from germicidal bulbs. The parts are sensitive
to a range of wavelengths, but I've never seen a response curve.

Natural sunlight doesn't have significant content at or near 2537 angstroms,
or we'd all be blind.
I was involved with some tests on EEPROMs, many years ago (back in the

days when the 2716, was 'new' technology).
We had 32 test chips, and put them on the lab windowsill for six
months, without a single bit error.
However we also put another set out in direct sunlight. On these, two
had bit errors after 3 months, and at the end of the test, five showed
errors.
The difference,the glass in the lab windows.
Ordinary glass is quite opaque to the required frequency (253.7nm), so
it is unlikely that chips will get erased in normal room lighting, or
from daylight through windows, but if the unit is outdorrs, the Sun,
does have the energy to cause problems over a long period.

Best Wishes

 

[kilowatt]

HELLO, MODERATOR, ?

Are you there.???? It is time to get rid of handbag, rolex watch
frauds and XXX ads.
Are you ever reading the posts, looks like you are not reading the
topic about managing your members.

I would be happy to post interesting items for members, but they can't
see the posts for all the JUNK STUFF.

Below was pasted FYI from the Google Groups Help Center site...

hoping for a miracle.
kw

NB: "Managing your members"

* How do I control who can access the new sections in my group?
* How do I add members to my group?
* How do I control who can post in my group?
* My members are listed as non-verified. What does that mean?
* Are there email addresses that can't be added to Groups?
* What is a pending member?
* What's the difference between an owner and a manager?
* How do I invite people to my group?
* How can I change a group member's settings?
* How do I remove a post in my group?
* How do I see a list of bouncing members in my group?
* Why was my request to add or invite members flagged for review?
* How do I approve pending members?
* How do I ban a member from my group?
* I've invited people to my group but they still haven't accepted
the invitation. What can I do?
* How do I transfer ownership of my group to another member?
* Can I have more than one manager or owner of my group?
* How do I export my group's member list?
* How do I make someone a manager of my group?
* How do I see a list of my group's members?
* How do I change permissions for a manager?
* Why was my request to add members converted to invites?
* How do I approve pending messages?
* Why was my request to add members denied?
* I deleted myself as owner and can no longer access my group.
What should I do?
* How can I send someone another invitiation to my group?

 

[Nobody]

On Tue, 06 Nov 2007 02:51:05 +0000, john jardine wrote:

Was looking at an ARM development board on Sunday. Are they straighforward
to program in assembly?.

The 32-bit ARM instruction set has to be the "cleanest" instruction
set in existence. The 16-bit version which is widely used on uC versions
is still a lot neater than typical 8/16-bit microprocessor instruction
sets.

However, that's just the core instruction set. Once you start dealing with
all the "bundled" extras (MMU, FPU, SIMD, I/O, Java, etc), things start
getting more involved.

It's also worth bearing in mind that the architecture was originally
conceived as the CPU for desktop systems rather than for twiddling I/O
pins, so the overall system is vastly more complex than a typical uC.

OTOH, there's likely to be less of a benefit to using assembler when you
have 16x32-bit registers and 128/256/512KiB flash and 32/64KiB of RAM with
a flat address space.

You might want to take a look at the datasheets for the AVR32 family to
get an idea:

http://www.atmel.com/dyn/products/datasheets.asp?family_id=682

I've now had 10 years of PICs and am heartily fed up with their obtuse,
infernal internals.
On average I get through maybe 4 jobs a year that use a PIC and each time
round I have to relearn the bit settings, the register defaults, the
interrupt sequencing, the pin allocating, the ... . It's a grade#1 pain.
Maybe it's because I'm not really interested in programming and see it as
just a means to an end, yet I still find it very easy to read Z80 assembly
listings from 15 years back and could still program one from scratch.
I reckon the PICs are doing my head in. There must be something better out
there. Perchance the ARM?.

If you're looking for overall system simplicity, you probably don't want a
32-bit RISC chip which is capable of being used as the main CPU for
everything from mobile phones to TCP/IP routers to Unix workstations.

 

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[Pieter]

On Wed, 31 Oct 2007 12:06:38 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Uwe Bonnes wrote:
Pieter <dit3_werkt_ook_niet@hotmail.com> wrote:
Hi,

I am building a device that can measure noise from resistors and
semiconductors. The source resistance ranges 0.2 Ohm to 20 MOhm.

But mostly semiconductors have to measured, and the range that is most
important is 500 Ohm to 2500 Ohm. That is the basic resistance of
those devices.

The frequency ranges to be measured are 0-10 Hz and 0-1 MHz. And the
noise is low, maximum of the semiconductor devices is 10 dB (compared
to the resistance 500 to 2500 Ohm), probably less.

For this project, I am searching a low noise N-JFET for the input
stage. This will be followed by a very low noise opamp like the AD797
or LT1028. The drain current will probably be something like 10 mA.

My questions:
What N-FETs (BFxxx? 2Nxxxx?) are really low-noise? Searching
datasheets is hopeless.
Does anyone here have advice about the input stage? Do you think a FET
input with opamp following it will do? Or can you think of better ones
that have lower noise, and lower input capacitance?

The BF862 is very low noise.


I was just going to suggest that one, it ought to be the lowest noise
JFET around. However, as Martin pointed out one may have to consider the
sub-audio region. NXP's data sheet is, ahem, rather skimpy. Do you (or
Martin) know about any study of the BF862 below, say, 20Hz?

Also, does anyone know what happened to the old 2N4417? Can't find it
anywhere these days.


Look at the Linear Technology site to use it in conjunction with low noise
fast Op-Amps.


I am a bit partial to the Texas THS series. Mostly because many can be
used at +/-10V and more, resulting in lots of dynamic range.

My problem is that I not only need the noise from 0 - 1MHz, but also
the low-frequency noise from 0 - 10 Hz. And it is unclear to me what
is does there.

I tried to simulate it in Multisim, but that gave very strange noise
results when I changed the frequency range (went from -110 dB to +33
dB).

Pieter