Chip with simple program for Toy

[Tom Biasi]

"Clint Sharp" <clint@clintsmc.demon.co.uk> wrote in message
news:+F4wslWX3zLIFwUZ@clintsmc.demon.co.uk...

In message <cYqdndlT493F9LDVnZ2dnUVZ_qPinZ2d@giganews.com>, Tom Biasi
tombiasi@optonline.net> writes
Not a good idea to just let the drive crash.
Tom


Drives don't 'crash' anymore because they autopark nowadays.
--
Clint Sharp

They do have an autopark feature but killing the power abruptly can still
cause a crash. Less likely than years ago but still can happen. I see them.

Tom

 

[Tom Biasi]

"Clint Sharp" <clint@clintsmc.demon.co.uk> wrote in message
news:+F4wslWX3zLIFwUZ@clintsmc.demon.co.uk...

In message <cYqdndlT493F9LDVnZ2dnUVZ_qPinZ2d@giganews.com>, Tom Biasi
tombiasi@optonline.net> writes
Not a good idea to just let the drive crash.
Tom


Drives don't 'crash' anymore because they autopark nowadays.
--
Clint Sharp

They do have an autopark feature but killing the power abruptly can still
cause a crash. Less likely than years ago but still can happen. I see them.

Tom

 

[Tom Biasi]

"Clint Sharp" <clint@clintsmc.demon.co.uk> wrote in message
news:Gg4ulxXVa2LIFwh2@clintsmc.demon.co.uk...

In message <YKudnRXGV7Cj3bLVnZ2dnUVZ_trinZ2d@giganews.com>, Tom Biasi
tombiasi@optonline.net> writes
They do have an autopark feature but killing the power abruptly can still
cause a crash. Less likely than years ago but still can happen. I see
them.
Do tell, the auto park I have seen is not an electronic feature, it's
mechanical so sudden power outage shouldn't cause a crash, I'd be
interested if this isn't always the case.

Tom



--
Clint Sharp

You are probably right, if they are made properly.
Do a search for "MacBooks 2.5-inch drive failure"
It is not wise to kill power to a spinning drive;
and a crash is not always 'head hitting platter', its a term also for sudden
failure. Such as when software crashes or drive firmware is damaged.
When I first responded I meant 'suddenly removing power'
Tom

 

[Tom Biasi]

<maaani2121@yahoo.com> wrote in message
news:c7c124a0-afdf-4f17-b108-5168fc7f9e6a@m45g2000hsb.googlegroups.com...

i have a presentation on emitter follower voltmeter and i dont know
nothing abut it.if anyone give me details on emiter follower voltmeter
mail me on maaaniforu21@yahoo.com

You don't need to know anything about it, just sleep at a Holiday Inn the
night before your presentation.

 

[Tom Biasi]

<maaani2121@yahoo.com> wrote in message
news:c7c124a0-afdf-4f17-b108-5168fc7f9e6a@m45g2000hsb.googlegroups.com...

i have a presentation on emitter follower voltmeter and i dont know
nothing abut it.if anyone give me details on emiter follower voltmeter
mail me on maaaniforu21@yahoo.com

You don't need to know anything about it, just sleep at a Holiday Inn the
night before your presentation.

 

[Bob Masta]

On Sun, 18 May 2008 09:02:49 -0400, Rich Webb
<bbew.ar@mapson.nozirev.ten> wrote:

On Sun, 18 May 2008 00:07:28 -0700 (PDT), mattyg1884@hotmail.com
wrote:

i need to measure a low frequency waveform from a DC circuit (voltage
up to 200mV). I need a sample rate of around 10Hz. to buy an
oscilloscope for this is a total overkill. I was thinking of using the
soundcard, but then realised it's AC coupled. any suggestions on a
cheap method to find this measurement?

I'm assuming you need an off-the-shelf solution, so recommendations
using dividers, buffers, and ADCs and the like are non-starters.

Several vendors have plug-in USB analog measurement gizmos. The
products at http://www.measurementcomputing.com/ are reasonable and
they include some basic data logging software as well as a DLL that
you could (?) use. The included logging software on the less expensive
models (e.g., USB-1208LS) maxes out at 10 sps (I think, been a while
since I used it) but the interface DLL will allow you to capture up to
the full rated speed of the modules.

Another possibility is the Dataq DI-194 starter kit. I haven't tested
this myself, but specs look great: 4 channels, +/-10V, 10 bits, up to
240 samples/sec, comes with chart recorder software, and is only
US$25.00. I've seen this advertised for years (maybe 10 years),
so it certainly has staying power. The only downside may be that it
uses a serial port interface. (I actually acquired some of these way
back when I was developing drivers for Daqarta for DOS, but there were
no DI-194 interface docs available back then and I never got around to
figuring it out by spying on the serial port traffic.)

Another alternative, if you have an old computer than can run
real-mode DOS (Win9x or earlier) and has a parallel printer port,
would be Daqarta for DOS with the LPTX driver and an 8-bit ADC
that you can build from a handful of resistors stuffed into a DB-25
connector shell. See <www.daqarta.com/download.htm> and look
at the LPTX driver pages at <www.daqarta.com/lptx.htm> for details.
Note that this only supports one channel, but it does go down to DC.
Daqarta for DOS is free for non-commerical use by requesting a license
at <www.daqarta.com/contact.htm>. Note, however, that the minimum
sample rate is limited to 18 Hz in the software.

Finally, if you want to use a Windows sound card you could consider
chopping your signal at (say) 1 kHz so that the resultant square wave
will pass the AC coupling easily. Depending on what you are trying to
do, this may be all you need. PLUG: Daqarta for Windows will show you
the waveform, and you can use its built-in voltmeter to measure Pk-Pk
or 0-Pk (instead of RMS or dB ranges) to recover the original voltage.
You'll need to calibrate your card using the included auto-calibrate
feature with a loopback cable, plus a single full-range calibration
measurement (full instructions at <www.daqarta.com/dw_00uu.htm>
and following.)

Daqarta for Windows is $29.00 for non-commercial use, but you can try
it for 30 trials/30 days for free, and after that it becomes a free
signal generator (and a whole lot of other stuff... just won't monitor
the input lines any more.)

I'd be glad to discuss your specific needs. Just contact me via the
contact form on the site.

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!

 

[Phil Allison]

<mattyg1884@hotmail.com>

i need to measure a low frequency waveform from a DC circuit (voltage
up to 200mV). I need a sample rate of around 10Hz. to buy an
oscilloscope for this is a total overkill.

** Anyone who * claims * they have no access to a basic " scope" is as
ass.

Beg, borrow or steal one.

You fuckwit asshole.




...... Phil

 

[Paul E. Schoen]

<mattyg1884@hotmail.com> wrote in message
news:3e12b887-6946-4410-a2d6-f69267a92726@t12g2000prg.googlegroups.com...

i need to measure a low frequency waveform from a DC circuit (voltage
up to 200mV). I need a sample rate of around 10Hz. to buy an
oscilloscope for this is a total overkill. I was thinking of using the
soundcard, but then realised it's AC coupled. any suggestions on a
cheap method to find this measurement?

I have heard of using a game port for this purpose, but it seems that it is
not very simple:

http://en.wikipedia.org/wiki/Game_port

The other suggestions for inexpensive A/D data acquisition devices are
good. Many of them use USB, while older ones used parallel or serial
interfaces. If you want to "roll your own", you can get a Microchip FS USB
PICdem board for about $40. It has A/D inputs that are connected to a pot
and a temperature sensor, and a simple GUI that monitors these values.

It is hard to imagine doing anything in electronics without an
oscilloscope, and there are lots of deals on older high performance scopes,
or simple PC based or hand held scopes. But they are generally more useful
for observing waveforms where rough peak values are enough, rather than
actual measurement (such as RMS value), which is best done with data
acquisition and analysis software.

Paul

 

[Bob Eld]

<mclesperance@gmail.com> wrote in message
news:af0c0a8f-a18a-48a9-bd78-abdecf5ca8f4@34g2000hsf.googlegroups.com...

Hello,

I created a low pass filter in orcad and trying to put theory into
pratical. The circuit output is always showing the input at about one
third the pk-pk voltage even at 30kHz and more, this is suppose to be
a 3kHz lpf.. I think the wiring might be wrong.
I took the black pin of the function generator as the ground reference
point. Use two 6v batteries for positive and negative voltage and
place the middle of the batteries at the ground reference point from
the function generator.
Here is a link with my circuit and a picture:
http://www3.sympatico.ca/lerameur/LPF/
Or does any one has a specific instruction to a simple active LPF and
wirinf connection, maybe I can start from there.
I tested my OP Amp, and that is not the problem.

k

As was mentioned, the LM339 is a comparator not an op amp. Use an LM 324, LF
347 or a TL084 or equivalent op amp. The 339 will probably oscillate if
used as an op amp and it needs a pull up resistor on the output of each amp
section. It ain't the right animal. Be sure to check the pin out, these amps
are very different than a 339.

Secondly there is no true dc path to ground for the amps except through the
generator. Place a 10K resistor from the input point on R5 to ground. This
will establish amplifier bias even when the generator is un-hooked.

Bypass the plus and minus power rails to ground with small caps, 0.1uF is
ok.

The circuit should work ok with proper amps as a six pole low pass filter
with 36db per octave cut off slope.

I calculate a cut off of 2kHz for two sections and 1364Hz for the first
section. This will be sloppy filter with a main cutoff at 2kHz. How did you
figure 3kHz?

 

[Bob Eld]

"sparky" <sparky12x@yahoo.com> wrote in message
news:d5f3d8a1-3012-4d3f-a389-2f3ec14577ae@e39g2000hsf.googlegroups.com...

Men in shorts turn muslims into raving sex crazed lunatics



Saturday, May 17, 2008
Netherlands: Complaints about construction workers dress
The heads of a contractor firm working on a large renovation project
in Almere were asked last week if the construction workers could
change their short pants into something with longer legs. The Muslim
neighbors had complained about the workers wearing such bare clothing.



In order not to succumb in the tropical heat of the past weeks, the
men had exchanged their work overalls for short pants and a t-shirt.
Construction workers Robin Willemsen says that they all walk around
with short pants. Together with his colleagues he's renovating the
outside of 750 residences in Almere.


Willemsen says that the contractor came to tell them that Muslim
neighbors had complained that their clothing were too bare and too
short. The comment was duly noted, but Willemsen says that they don't
intend to dress in overalls in such sweltering heat.



The complaints were new for Richard Hekert of construction firm
Mateboer from Kampen, and he says there were agreements about correct
clothing, and that includes short pants and t-shirts too, but if
residents think it's a serious nuisance, they'll see how they can
solve it.

Tell the Muslims to turn their Burkas around so they can't see out of them.
Better yet, send the Muslims back to Pakistan where they belong. Who cares
what they like? Or, put up a nice high bill board to shield the site so the
Muslims can't see in. You can even put the cartoon picture of Mohammad on
the bill board. See how they like that instead of shorts. Muslims,
intolerant bastards, they!

 

[Paul E. Schoen]

"sparky" <sparky12x@yahoo.com> wrote in message
news:d5f3d8a1-3012-4d3f-a389-2f3ec14577ae@e39g2000hsf.googlegroups.com...

Men in shorts turn muslims into raving sex crazed lunatics



Saturday, May 17, 2008
Netherlands: Complaints about construction workers dress
The heads of a contractor firm working on a large renovation project
in Almere were asked last week if the construction workers could
change their short pants into something with longer legs. The Muslim
neighbors had complained about the workers wearing such bare clothing.



In order not to succumb in the tropical heat of the past weeks, the
men had exchanged their work overalls for short pants and a t-shirt.
Construction workers Robin Willemsen says that they all walk around
with short pants. Together with his colleagues he's renovating the
outside of 750 residences in Almere.


Willemsen says that the contractor came to tell them that Muslim
neighbors had complained that their clothing were too bare and too
short. The comment was duly noted, but Willemsen says that they don't
intend to dress in overalls in such sweltering heat.



The complaints were new for Richard Hekert of construction firm
Mateboer from Kampen, and he says there were agreements about correct
clothing, and that includes short pants and t-shirts too, but if
residents think it's a serious nuisance, they'll see how they can
solve it.

Easy. If thine eye offend thee, pluck it out! I'm sure the workers would
lend these poor bedeviled creatures some tools that would do the job.

Paul

 

[Phil Allison]

"Paul E. Schoen"

It is hard to imagine doing anything in electronics without an
oscilloscope,

** That's for sure.

and there are lots of deals on older high performance scopes, or simple PC
based or hand held scopes.

** Or this 10 MHz one for A$88, including 10:1 probe.

http://www.dse.com.au/cgi-bin/dse.storefront/4830f5a10d20925a2740c0a87f9c071c/Product/View/Q1803

But they are generally more useful for observing waveforms where rough
peak values are enough,

** You get to see the peak value, as part of the whole wave shape, and it is
not a "rough" value.

All modern, internal graticule tube scopes can easily achieve 1% accuracy on
voltage - providing you occasionally calibrate the range. This can be
easily done using DC voltages, verified with a DMM.

rather than actual measurement (such as RMS value), which is best done
with data acquisition and analysis software.

** You still need to SEE the waveshape or you have not got a clue what you
are measuring. RMS meters have strict bandwidth limitations and max crest
factors - so you must know the actual waveform or the readings are
meaningless.

A scope allows you to make voltage measurements with certainty.



...... Phil

 

[Phil Allison]

"Paul E. Schoen"

It is hard to imagine doing anything in electronics without an
oscilloscope,

** That's for sure.

and there are lots of deals on older high performance scopes, or simple PC
based or hand held scopes.

** Or this 10 MHz one for A$88, including 10:1 probe.

http://www.dse.com.au/cgi-bin/dse.storefront/4830f5a10d20925a2740c0a87f9c071c/Product/View/Q1803

But they are generally more useful for observing waveforms where rough
peak values are enough,

** You get to see the peak value, as part of the whole wave shape, and it is
not a "rough" value.

All modern, internal graticule tube scopes can easily achieve 1% accuracy on
voltage - providing you occasionally calibrate the range. This can be
easily done using DC voltages, verified with a DMM.

rather than actual measurement (such as RMS value), which is best done
with data acquisition and analysis software.

** You still need to SEE the waveshape or you have not got a clue what you
are measuring. RMS meters have strict bandwidth limitations and max crest
factors - so you must know the actual waveform or the readings are
meaningless.

A scope allows you to make voltage measurements with certainty.



...... Phil

 

[Phil Allison]

<mclesperance@gmail.com

Here is a link with my circuit and a picture:
http://www3.sympatico.ca/lerameur/LPF/

** All I see is a blank screen on a Tek scope.



..... Phil

 

[Phil Allison]

<mclesperance@gmail.com

Here is a link with my circuit and a picture:
http://www3.sympatico.ca/lerameur/LPF/

** All I see is a blank screen on a Tek scope.



..... Phil

 

[BobW]

"Green Xenon [Radium]" <glucegen1@excite.com> wrote in message
news:483339b3$0$7044$4c368faf@roadrunner.com...

John Larkin wrote:


If you hang a medium-sized coin from a string, it might have a
picofarad of capacitance to the world. Since

Q = C * V

and Qe, the charge on an electron, is -1.6e-19 colombs, then if you
whack the coin with one electron, the change in voltage is negative
about 160 nanovolts. Numbers like that aren't impossible to measure,
so it's feasible that some science-project level of effort could
measure single electron charges using Mouser-type parts.


One electron is -1.6e-19 coulomb. So if the coin is hit with one electron,
wouldn't there be a negative voltage of 1.6e-19 volt?

Your head is all screwed up, Radium. Why don't you try reading a book on the
subject? Why don't you take a class in basic physics?

Thanks.

Bob
--
== NOTE: I automatically delete all Google Group posts due to uncontrolled
SPAM ==

 

[BobW]

"Green Xenon [Radium]" <glucegen1@excite.com> wrote in message
news:483339b3$0$7044$4c368faf@roadrunner.com...

John Larkin wrote:


If you hang a medium-sized coin from a string, it might have a
picofarad of capacitance to the world. Since

Q = C * V

and Qe, the charge on an electron, is -1.6e-19 colombs, then if you
whack the coin with one electron, the change in voltage is negative
about 160 nanovolts. Numbers like that aren't impossible to measure,
so it's feasible that some science-project level of effort could
measure single electron charges using Mouser-type parts.


One electron is -1.6e-19 coulomb. So if the coin is hit with one electron,
wouldn't there be a negative voltage of 1.6e-19 volt?

Your head is all screwed up, Radium. Why don't you try reading a book on the
subject? Why don't you take a class in basic physics?

Thanks.

Bob
--
== NOTE: I automatically delete all Google Group posts due to uncontrolled
SPAM ==

 

[Don Klipstein]

In article <483339b3$0$7044$4c368faf@roadrunner.com>, Green Xenon
[Radium] wrote:

John Larkin wrote:

If you hang a medium-sized coin from a string, it might have a
picofarad of capacitance to the world. Since

Q = C * V

and Qe, the charge on an electron, is -1.6e-19 colombs, then if you
whack the coin with one electron, the change in voltage is negative
about 160 nanovolts. Numbers like that aren't impossible to measure,
so it's feasible that some science-project level of effort could
measure single electron charges using Mouser-type parts.

One electron is -1.6e-19 coulomb. So if the coin is hit with one
electron, wouldn't there be a negative voltage of 1.6e-19 volt?

It would be 1.6e-19 volt divided by the coin's capacitance (to
ground) in farads.

Charge in a capacitor is voltage times capacitance. Voltage across a
capacitor is charge divided by capacitance.

If you want some good reading, I totally recommend my favorite physics
textbook, "University Physics" by Sears, Zemansky and Young. When I
was young, I often read that one when I had time to read, before I was
in highschool physics. Any edition is good. Libraries sometimes have it.

- Don Klipstein (don@misty.com)

 

[Don Klipstein]

In article <483339b3$0$7044$4c368faf@roadrunner.com>, Green Xenon
[Radium] wrote:

John Larkin wrote:

If you hang a medium-sized coin from a string, it might have a
picofarad of capacitance to the world. Since

Q = C * V

and Qe, the charge on an electron, is -1.6e-19 colombs, then if you
whack the coin with one electron, the change in voltage is negative
about 160 nanovolts. Numbers like that aren't impossible to measure,
so it's feasible that some science-project level of effort could
measure single electron charges using Mouser-type parts.

One electron is -1.6e-19 coulomb. So if the coin is hit with one
electron, wouldn't there be a negative voltage of 1.6e-19 volt?

It would be 1.6e-19 volt divided by the coin's capacitance (to
ground) in farads.

Charge in a capacitor is voltage times capacitance. Voltage across a
capacitor is charge divided by capacitance.

If you want some good reading, I totally recommend my favorite physics
textbook, "University Physics" by Sears, Zemansky and Young. When I
was young, I often read that one when I had time to read, before I was
in highschool physics. Any edition is good. Libraries sometimes have it.

- Don Klipstein (don@misty.com)

 

[Paul E. Schoen]

"aleksa" <aleksaZR@gmail.com> wrote in message
news:018b7590-87fb-4a29-ba87-1871db7a6c24@w34g2000prm.googlegroups.com...

I've bought 10 pcs of "82C55" through mail, and received D82C55AC-2.

The problem is that the output high voltage of any pin is not 5V, but
3.8V.

Nothing is connected to the port pins, VCC is 4.85V.

Am I wrong thinking that CMOS chips should have far more than 3.8V on
output pins?

Thanks

I have an old product that used an 8255 to interface to TTL logic, and I
recall some problems when we tried to use CMOS versions. I think we could
fix it by using pullups, but it was easier to get the non-CMOS version. I
don't have the data sheets handy, but I think your parts probably meet
specs. I think the 8255s are actually BICMOS.

Paul