audio recording on IC -help wanted

travolta011@gmail.com wrote:
Windows XP tips and tricks. Learn how to bypass very common windows
problems, speed up your system and make it more reliable with useful
tips and tricks. http://windows-xp-tipss.blogspot.com/
Here's a good way of bypassing windows problems. It doesn't bypass any
Linux problems though: http://fedoraproject.org/.
 
travolta011@gmail.com wrote:
Windows XP tips and tricks. Learn how to bypass very common windows
problems, speed up your system and make it more reliable with useful
tips and tricks. http://windows-xx-tipss.blogspot.com/
Is it true that any gmail'r posting about blogspot, its a SPAM attack.
 
On Fri, 09 Nov 2007 23:04:37 -0500, John Popelish <jpopelish@rica.net>
wrote:

mad.scientist.jr@gmail.com wrote:
Can anyone explain how to (or where to find instructions) build an
accurate linear slide potentiometer of 100k, 150k or 1M ohm? I am
looking to make one with a physical length would be from 2" to 10". I
have seen little exercises where you can draw a pencil line on paper
and connect electrodes to it, and it acts as a resistor, so I am
thinking that building a slide pot might be possible with the right
materials. Any info appreciated...

Have you considered building a string pot?
http://www.celesco.com/stringpots/index.htm
I'll second this recommendation. Many years ago in an alternate
universe far, far away I was an automotive engineer for GM, and
we used string pots a lot for long-travel measurements. One
application in particular was monitoring the motion of suspension
parts during travel down various roads. String pots were more
accurate than (say) tricks with multiple accelerometers (which we
also used in abundance) when you wanted displacement.

As I recall, the stringpots were basically 10-turn rotary pots with
a return-spring mechanism that tried to keep them at one end of the
travel. A string around the shaft pulled against the spring to
advance the pot. Stringpots with stronger springs handled higher
accelerations.

Depending on your application, you might not need this return-spring
at all... use an old-time radio dial arrangement that turns a pot
instead of the tuning cap.

Best regards,


Bob Masta

DAQARTA v3.50
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, FREE Signal Generator
Science with your sound card!
 
On Wed, 28 Nov 2007 15:42:52 GMT, Lostgallifreyan <no-one@nowhere.net> wrote:

Slightly off-topic, but it's a question people here might know better than
anyone on the planet.

I'm after a Class 1, bluetooth v2 (must also do v1.2) adapter for serial
ports (DB9). Needs SPP profile, no other profiles required, but they might
be useful. Baud rates from 1200 to as high as possible, and must include
57600).

It must be powered entirely from a standard PC computer's port, with no
unusual wiring or external supply. Having trawled Google many times looking
for something to bypass all the software nonsense trying to get something
that will install W98 drivers, I decided it must NOT have a need for any
drivers at all. I thought I'd found a good answer, then found that the
config program MUST have .net framework! Pretty stupid for a device someone
might want to run from OpenBSD, or DOS, no? :)

Has anyone got a nice definitive sort of answer for this? I'm prepared to
spend up to $100 (Ł50, and cheaper would be cool...) for a device that can
allow me to operate exactly as if I'd just plugged a cable to a DB9, with
no strange wiring or power requirements, no driver requirements, and ALL
config, if any is needed, easily done by communicating with it by text
commands written in a terminal emulator.

Please don't point me to links and general possibilities, I can easily find
too many of those on Google to choose easily, and still find nasty gotchas
like .net requirements that are not openly declared. I'm asking here hoping
for answers from people who use these things, and already know firsthand
what works best and most easily, and is completely independent from the
host operating system.
You will not find one powered only by the serial port. Bluetooth needs more power than can be sucked
from RS232.

However for all the other aspects, how about this :
http://cpc.farnell.com/jsp/Computer+Products/Networking,+Broadband+&+Modems/PRO+SIGNAL/NLBT-RS232/displayProduct.jsp?sku=CS14739&_requestid=183040

(if you add '01' after the order code it will be cheaper - currently on special offer)

power is via a mini-usb socket, so can be powered from a spare USB socket or AC adapter
 
Mike Harrison <mike@whitewing.co.uk> wrote in
news:656rk39jov92v0qtjgadec6rc5k0l4hblj@4ax.com:

You will not find one powered only by the serial port. Bluetooth needs
more power than can be sucked from RS232.
http://www.blueconsole.com/
I found one other but can't remember what it was. Someone had tested it and
was stating that they found it to be true though. That BlueConsole device
is Class 1, so lower power Class 2 devices should cope, too.

However for all the other aspects, how about this :
http://cpc.farnell.com/jsp/Computer+Products/Networking,+Broadband+&+Mo
dems/PRO+SIGNAL/NLBT-RS232/displayProduct.jsp?sku=CS14739&_requestid=18
3040

(if you add '01' after the order code it will be cheaper - currently
on special offer)

power is via a mini-usb socket, so can be powered from a spare USB
socket or AC adapter
I like that it has a switch to change from DCE to DTE saving need for a
null modem adapter. They don't say whether there is a configuration needed
by software though. The one that did (and required .net) was also billed as
not requiring software. That's why I want advice from people who have used
these. I can't go by seller's declarations alone. They're too expensive to
take reckless chances on.
 
On Thu, 29 Nov 2007 12:45:42 GMT, Lostgallifreyan <no-one@nowhere.net> wrote:

Mike Harrison <mike@whitewing.co.uk> wrote in
news:656rk39jov92v0qtjgadec6rc5k0l4hblj@4ax.com:

You will not find one powered only by the serial port. Bluetooth needs
more power than can be sucked from RS232.


http://www.blueconsole.com/
I found one other but can't remember what it was. Someone had tested it and
was stating that they found it to be true though. That BlueConsole device
is Class 1, so lower power Class 2 devices should cope, too.
I suppose you might get away with it for a true (desktop) type RS232, depending on data duty cycle.
but I doubt it would work on any charge-pump type driver (e.g. laptops)

However for all the other aspects, how about this :
http://cpc.farnell.com/jsp/Computer+Products/Networking,+Broadband+&+Mo
dems/PRO+SIGNAL/NLBT-RS232/displayProduct.jsp?sku=CS14739&_requestid=18
3040

(if you add '01' after the order code it will be cheaper - currently
on special offer)

power is via a mini-usb socket, so can be powered from a spare USB
socket or AC adapter


I like that it has a switch to change from DCE to DTE saving need for a
null modem adapter. They don't say whether there is a configuration needed
by software though. The one that did (and required .net) was also billed as
not requiring software. That's why I want advice from people who have used
these. I can't go by seller's declarations alone. They're too expensive to
take reckless chances on.
I can email you the instruction sheet for this unit if you want.
 
Mike Harrison <mike@whitewing.co.uk> wrote in
news:deotk3h3q300gjhlb1h11k0cnsitjmanmt@4ax.com:

http://www.blueconsole.com/
I found one other but can't remember what it was. Someone had tested
it and was stating that they found it to be true though. That
BlueConsole device is Class 1, so lower power Class 2 devices should
cope, too.

I suppose you might get away with it for a true (desktop) type RS232,
depending on data duty cycle. but I doubt it would work on any
charge-pump type driver (e.g. laptops)
I'd be using them on PC's with 12V signalling, so I think they'd be ok.
Doesn't matter if if it must use external power, it's more important that
no software is needed. No drivers, and no config programs other than what a
serial terminal emulator can do. (I'd prefer that to fiddly fragile DIP
switches too, especially as the adapter is supposed to be useful when out
of physical reach).

However for all the other aspects, how about this :
http://cpc.farnell.com/jsp/Computer+Products/Networking,+Broadband+&+
Mo
dems/PRO+SIGNAL/NLBT-RS232/displayProduct.jsp?sku=CS14739&_requestid=
18 3040

(if you add '01' after the order code it will be cheaper - currently
on special offer)

power is via a mini-usb socket, so can be powered from a spare USB
socket or AC adapter


I like that it has a switch to change from DCE to DTE saving need for
a null modem adapter. They don't say whether there is a configuration
needed by software though. The one that did (and required .net) was
also billed as not requiring software. That's why I want advice from
people who have used these. I can't go by seller's declarations alone.
They're too expensive to take reckless chances on.

I can email you the instruction sheet for this unit if you want.
Yes pleas, that will help. I have a gmail address in the same name I use
here.

Has no-one else here used these? I'm surprised I haven't heard at least one
comment from someone who built one. :)
 
"Bo-Lennart" <bo-lennart.karlsson@telia.com> wrote in message
news:a33a23b4-9601-4639-975c-290392eb6c66@j44g2000hsj.googlegroups.com...
Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!
Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

regards doug. in U.K
 
"doug" (doug.morsit@virgin.net) writes:
"Bo-Lennart" <bo-lennart.karlsson@telia.com> wrote in message
news:a33a23b4-9601-4639-975c-290392eb6c66@j44g2000hsj.googlegroups.com...
Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!


Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

But why do you think that? Merely because it was a popular voltmeter IC
does not mean it's what is used. Fluke is a big enough test equipment
manufacturer that it seems likely that it is worth their while to use
custom ICs. Let's not forget that the Intersil IC is thirty years old,
and is merely a voltmeter IC. It takes a fair amount of external circuitry
to make it into an actual DMM, and when making a lot of DMMs it's usually
worth getting as much integration as possible. What was ground breaking
in '77 or '78 isn't groundbreaking 30 years later.

I've never opened one of those $9.95 DMMs with wired in test leads and flat
as possible but I doubt they would use a voltmeter IC that requires a bunch
of other ICs to get a complete set of functions. And if they can get it
all into a blob of epoxy, there's even less reason for Fluke to use
multiple ICs.

That said, your suggestion isn't completely bad. Because again, it's
always worth putting in some time before trying to track down an expensive
and hard to get IC. So the original poster can go through known voltmeter
ICs, and see if there is any common ground between the "sample circuit"
in the datasheets and the actual meter. A quick glance will say one way
or another, it's when there is a match on some analog component (since
those are few they are an easy way to check) that more work is required,
because then one has to see if the premise actually goes all the way.

Michael
 
On Tue, 4 Dec 2007 03:16:33 -0800 (PST) Bo-Lennart
<bo-lennart.karlsson@telia.com> wrote in Message id:
<a33a23b4-9601-4639-975c-290392eb6c66@j44g2000hsj.googlegroups.com>:

Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!
Here's one for 40 bucks buy-it-now.
http://cgi.ebay.com/FLUKE-8600A-DIGITAL-MULTIMETER_W0QQitemZ290164936064QQcmdZViewItem

On the plus side you'd then have a parts unit to pick from.
On the minus side you'd need someone to buy it for you, as the guy will
only ship to US or Canada.
 
bo-lennart.karlsson@telia.com> wrote

I'm have just bought an broken FLUKE 8600A bench-multimeter.
....
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
....
With the very best regards from SWEDEN
....
JW <none@dev.nul> wrote:
Here's one for 40 bucks buy-it-now.
http://cgi.ebay.com/FLUKE-8600A-DIGITAL-MULTIMETER_W0QQitemZ290164936064QQcmdZ
ViewItem

On the plus side you'd then have a parts unit to pick from.
On the minus side you'd need someone to buy it for you, as the guy will
only ship to US or Canada.
Heck, I've got an 8600A I'd sell for $30 (whole thing, you can pull the
chip yourself), but I'm darned if I know how I'd get it shipped to
Sweden. I suppose I could pull the chip and stick it in an antistatic
bag to make the shipping less, but there's still the hassle (customs and
what-not) and cost of getting it shipped at any size. Looks like more
than $45 to ship a half-pound (quarter kilo) from here to there. Seems
rather expensive for fixing a 32 year old 3.5 digit meter, especially if
the chip does not turn out to be the whole problem.

--
Cats, coffee, chocolate...vices to live by
 
On Wed, 05 Dec 2007 00:45:40 GMT, "doug" <doug.morsit@virgin.net>
wrote:

"Bo-Lennart" <bo-lennart.karlsson@telia.com> wrote in message
news:a33a23b4-9601-4639-975c-290392eb6c66@j44g2000hsj.googlegroups.com...
Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!


Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

regards doug. in U.K

I checked. Different pinout and function.

RL
 
On Dec 11, 11:34 am, Dystopia <x...@dsl.pipex.com> wrote:
"Dystopia" <x...@dsl.pipex.com> wrote in message
news:mrhrl3djsk3ao8kmfjkfhbcuj5a8guv98r@4ax.com...
I have a motor home which has the main battery for the engine and an
auxiliary battery to supply the lighting etc in the living area. With
the ignition off a relay switches the auxiliary battery to supply the
living area but when the vehicle is running the relay connects the
auxiliary battery in parallel with the main battery so that it is
charged. The circuit is badly designed because if the auxiliary
battery is flat and the main battery is fully charged (which it always
is) there is a very high current surge from the main battery to the
auxiliary which blows the 30A inline fuse. I, therefore, need to
insert a circuit to restrict the current to say 20A max.

Can anyone say where there is a suitable circuit diagram on the web?

Thanks for all the ideas. An isolator is the real answer and if I was
designing it from scratch that is what I would use but the relay
serves as an isolator albeit a very poor one. I had thought of using
a resistance to limit the flow and the bulb is a good idea but I am
concerned about the heat generated in the small space where the
circuits are installed.

For info. I have draw a wiring diagram of the circuit, as it is, and
put it here:

http://vanwiring.hobby-site.com

I had thought in terms of a simple circuit using a 2N3055 with a zener
in the common base circuit and if you scroll down below the wiring
diagram on the web site I have sketched what I mean. Anyone any ideas
about this one please?
I was hoping someone would come up with a circuit since I could use
such a box myself. I really don't think you can make a decent
controller without some current limiting. I did a few back of the
envelope designs for this application awhile ago and concluded
anything linear makes too much heat. You would probably need a
hysteretic current-mode controller. It is best to have a working
design since there are plenty of gotchas in switchers.
 
"mtech" <marin.zorica/REMOVE/@zd.t-com.hr> wrote in
news:fjgtg7$n25$1@ss408.t-com.hr:

Hello!

Does anybody know who manufacter led tike this?

http://www.fotorola.com/uploads/3854fe25f5.jpg

Also are there any shop where this can be found?

tnx!
The packaging looks like Hewlett Packard.
 
Jim Thompson wrote:
On Fri, 14 Dec 2007 15:17:15 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Winfield Hill wrote:
Joerg wrote:
John Larkin wrote:
Joerg wrote:
Brief question: Are the BFS17 and the old BFW92 the same or nearly the
same die? Many Spice models for the BFS17 use BFW92 parameters (for
example NXP).
http://www.nxp.com/models/spicespar/data/BFS17.html#0
The BFS17 is a nice transistor, fast but not too fast.
And cheap. I am just puzzled about the Spice model for it. So far I have
always just built the stuff but this time some of the "miscellaneous"
parts are not right here on my desk so it has to be a sim.
How does this model compare?

.MODEL BFS17 NPN BF=93 BR=25 CJC=1.54E-12 CJE=1.18E-12
+ IKF=.055 IKR=.01 IRB=5E-4 IS=4.9E-16 ISC=4.5E-15 ISE=1E-14
+ ITF=2.3 MJC=.25 MJE=.4 NC=1.2 NE=1.800 NF=.993 NR=1.005
+ RB=7 RBM=.5 RC=2.0 RE=.5 TF=5E-11 TR=2.4E-8 VAF=90 VAR=6
+ VJC=.559 VJE=1.12 XTF=100

Really close to the Zetex model but farther away from the NXP model.

Please post all three... I like to amuse myself seeing how each was
derived ;-)

...Jim Thompson
Ok, Win's is right above.

Zetex:
..MODEL BFS17 NPN IS =4.9E-16 NF =.993 BF =93 VAF=90 IKF=.055
+ ISE=1E-14 NE =1.800 BR =25 VAR=6 NR =1.005 IKR=.01
+ ISC=4.5E-15 NC =1.2 RB =7 RBM=.5 IRB=5E-4 RE =.5
+ RC =2.0 TF =5E-11 XTF=100 ITF=2.3 TR =2.4E-8
+ CJE=1.18E-12 CJC=1.54E-12 VJC=.559 MJC=.25 VJE=1.12
+ MJE=.4

Philips/NXP:
..MODEL DBFS17 NPN
+ IS = 3.157E-16
+ BF = 102
+ NF = 0.9953
+ VAF = 28
+ IKF = 0.12
+ ISE = 4.184E-15
+ NE = 1.623
+ BR = 46
+ NR = 0.9952
+ VAR = 9
+ IKR = 0.022
+ ISC = 1.004E-15
+ NC = 1.108
+ RB = 4
+ IRB = 8E-05
+ RBM = 4
+ RE = 0.55
+ RC = 2
+ XTB = 0
+ EG = 1.11
+ XTI = 3
+ CJE = 9.45E-13
+ VJE = 0.676
+ MJE = 0.2361
+ CJC = 1.1E-12
+ VJC = 0.5166
+ MJC = 0.2761
+ XCJC = 0.4
+ TF = 6.7E-11
+ XTF = 150
+ VTF = 0.6
+ ITF = 0.75
+ PTF = 21
+ TR = 1E-09
+ FC = 0.96


--
Regards, Joerg

http://www.analogconsultants.com/
 
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!
 
On Sun, 13 Jan 2008 11:56:59 GMT, "TT_Man" <Someone@ntlworld.com>
wrote:

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!
That is 'fun'. :)
If you remember that all the exposed semiconductor junctions, _do_
have the ability to behave as photodiodes, I'd guess that the light
was fractionally altering the bias current somewhere in the die. A
very 'unusual' fault!...

Best Wishes
 
Roger Hamlett <rogerspamignored@ttelmah.demon.co.uk> wrote in
news:6heko3h9o5pm9e47tcpnpavuab6i5kv1e6@4ax.com:

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!
That is 'fun'. :)
If you remember that all the exposed semiconductor junctions, _do_
have the ability to behave as photodiodes, I'd guess that the light
was fractionally altering the bias current somewhere in the die. A
very 'unusual' fault!...
Agreed, nice find. Probably is photodiode effect, the near IR that silicon is
most sensitive to is strong in a small incandescent, almost ideally matched.
 
On Sun, 13 Jan 2008 12:30:07 -0800 (PST), lessspamjonson@gmail.com
wrote:

Windows XP tips and tricks. Learn how to bypass very common windows
problems, speed up your system and make it more reliable with useful
tips and tricks. http://windows-xp-tipss.blogspot.com

Is that a Virus?
 

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