MessageView 421F schematic

[JMini]

On 6/22/2008 2:52:30 PM, instantwow wrote:

I recently purchased an oscilloscope on Ebay. It is a 100Mhz model. I
was configuring the scope using the calibration output, which is a
1Khz 2 volt square wave. The horizontal line drawing on the scope
looks good, however, the vertical trace portion on this wave is barely
visible at the highest brightness setting. Is the normal, or is there
a problem with the scope? Is this common with analog scopes? This is
my first oscilloscope, so I’m not sure. Here’s a photo I took. Any
ideas?

http://www.flickr.com/photos/27262651@N04/2601539284/
Thanks.

It's just making the transition from 0V to 2V almost instantaneously (high

slew rate). Leaving little time for the phosphor on the screen to respond. It
looks like it's responding well.

 

[Pierre-François (f5bqp_pf]

Hi to all of you,

I've tried as a test to see the serious of this request by asking the
purchase of a MINT quite recent U3661 26Ghz spectrum analyser full option.
I can tell you that their offer isn't serious at all...
It's just if you don't have to give them some money in addition...

This company is:
Test Equipment Connection Corporation
30 Skyline Drive Lake Mary FL. 32746
PHONE800)615-8378 / 407-804-1780 FAX: (800) 819-8378 /
407-804-1277
Sales@TestEquipmentConnection.com www.TestEquipmentConnection.com



Not serious guys, believe me...

pf
f5bqp





<phillipvogel@gmail.com> a écrit dans le message de news:
bf0662af-27bb-4e77-8e60-39c8dff6cb76@b1g2000hsg.googlegroups.com...

Anritsu Sitemasters Wanted

also buying various spectrum analyzers and oscilloscopes

email to:
phillipvogel@gmail.com

 

[Pierre-François (f5bqp_pf]

Hi,

And when I say these guys aren't serious I wheight my words!...

My MINT very new U3661 full option including the tracking generator they
wanted to buy it from me at $3500 and I discovered they are offering a less
interesting one (no tracking gen, no high stab reference, no carrying case,
no front cover) on ebay for $14 995 !!!...
More than 4 times!!!

http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&rd=1&item=200220192424&ssPageName=STRK:MEWA:IT&ih=010


What a gangsters!!!


pf




"Pierre-François (f5bqp_pfm)" <NOSPAM@MAPSON.com> a écrit dans le message de
news: 486d39d3$0$908$ba4acef3@news.orange.fr...

Hi to all of you,

I've tried as a test to see the serious of this request by asking the
purchase of a MINT quite recent U3661 26Ghz spectrum analyser full option.
I can tell you that their offer isn't serious at all...
It's just if you don't have to give them some money in addition...

This company is:
Test Equipment Connection Corporation
30 Skyline Drive Lake Mary FL. 32746
PHONE800)615-8378 / 407-804-1780 FAX: (800) 819-8378 /
407-804-1277
Sales@TestEquipmentConnection.com www.TestEquipmentConnection.com



Not serious guys, believe me...

pf
f5bqp





phillipvogel@gmail.com> a écrit dans le message de news:
bf0662af-27bb-4e77-8e60-39c8dff6cb76@b1g2000hsg.googlegroups.com...
Anritsu Sitemasters Wanted

also buying various spectrum analyzers and oscilloscopes

email to:
phillipvogel@gmail.com

 

[Pierre-François (f5bqp_pf]

Stupid response!
Yes I've idea, believe me!
But is it a reason to try to screw up a potential seller?
I don't think so...
I'm in the business may be more longer than you're, so before replying with
a stupid response and trying to find stupid excuses turn your tong 7 times
in your mouth and then send your response...
Probably you'll be less ridiculous...

pf


"Michael A. Terrell" <mike.terrell@earthlink.net> a écrit dans le message de
news: D5WdnaU_QMrJv-3VnZ2dnUVZ_jmdnZ2d@earthlink.com...

"Pierre-François (f5bqp_pfm)" wrote:

Hi,

And when I say these guys aren't serious I wheight my words!...

My MINT very new U3661 full option including the tracking generator they
wanted to buy it from me at $3500 and I discovered they are offering a
less
interesting one (no tracking gen, no high stab reference, no carrying
case,
no front cover) on ebay for $14 995 !!!...
More than 4 times!!!

http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&rd=1&item=200220192424&ssPageName=STRK:MEWA:IT&ih=010

What a gangsters!!!


What a MORON. Even if the thing was NOS and still sealed in the
original carton, old test equipment needs to be test, calibrated, and
certified. Then they have to stand behind it, if something goes wrong
under their warranty. Do you have ANY idea how expensive it is to run a
cal lab? How expensive parts, manuals and employees to do the work
are? Taxes, insurance, utilities, business licenses, shipping and a
thousand other small things it takes to operate a Metrology/Calibration
Lab?

If you're a penny pincher lock for stuff in dumpsters, and left
behind at hamfests.


--
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If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm

Sporadic E is the Earth's aluminum foil beanie for the 'global warming'
sheep.

 

[Pierre-François (f5bqp_pf]

Hi,

Did you found your manuals?

pf

"mimmobn" <domenicopennino@gmail.com> a écrit dans le message de news:
feee551a-4f7a-459a-baf3-25c97bdfc66f@k30g2000hse.googlegroups.com...

help

I have a spectrum analyzer Tektronix 492 and not have the manual for
repair

my problem is:
turns on and seem to work well, but no analyzes the input signal is
displayed only noise.

please help me by searching the handbook of service for repair?

thank you

 

[Pierre-François (f5bqp_pf]

Stupid again!
Speak my language like I speak yours!
Chiao!
pf

"Michael A. Terrell" <mike.terrell@earthlink.net> a écrit dans le message de
news: rvGdncEGDrj4_OzVnZ2dnUVZ_jOdnZ2d@earthlink.com...

"Pierre-François (f5bqp_pfm)" wrote:

Stupid response!
Yes I've idea, believe me!
But is it a reason to try to screw up a potential seller?
I don't think so...
I'm in the business may be more longer than you're, so before replying
with
a stupid response and trying to find stupid excuses turn your tong 7
times
in your mouth and then send your response...
Probably you'll be less ridiculous...


Is English you third, or forth language? You make absolutely no
sense, and only add more proof that you are a fool. If the messages you
sent them read like this, I'm sure they don't want to deal with you.
You whine like a four year old, and no one is impressed that you can
hold your breath till you turn blue.

--
http://improve-usenet.org/index.html

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm

Sporadic E is the Earth's aluminum foil beanie for the 'global warming'
sheep.

 

[Tom Biasi]

"sal2" <sal2@sal2.com> wrote in message
newsan.2008.07.08.08.33.25@sal2.com...

Greets All

I'm trying to amplify my audio from my computer sound card and turn it
into a Tens machine. So I need to increase the current/voltage do you
guys know/recommend the best way to go about doing this? The
frequency range I plan to use is from 1Hz to 20KHz.

Aloha
Rick

Not a good idea to hook yourself up to a device that is supplied by line
current.
Medical devices are strictly designed.
If its a battery powered laptop it would be safer but the sound card will
probably not do what you want.

Tom

 

[Bob Masta]

On Tue, 8 Jul 2008 07:36:11 -0400, "Tom Biasi"
<tombiasi***@optonline.net> wrote:

"sal2" <sal2@sal2.com> wrote in message
newsan.2008.07.08.08.33.25@sal2.com...
Greets All

I'm trying to amplify my audio from my computer sound card and turn it
into a Tens machine. So I need to increase the current/voltage do you
guys know/recommend the best way to go about doing this? The
frequency range I plan to use is from 1Hz to 20KHz.

Aloha
Rick

Not a good idea to hook yourself up to a device that is supplied by line
current.
Medical devices are strictly designed.

Agreed, but see below.

If its a battery powered laptop it would be safer but the sound card will
probably not do what you want.

It's been a long time since I looked at TENS, but my recollection is
that they used rectangular pulses. If so, then you could use an
optoisolator on the output of the sound card, driving a battery
operated stimulator. Note that sound cards are AC coupled,
so the "zero" baseline will move when you change the duty cycle.
You may want to use a zero-recovery circuit ahead of the optoisolator,
if you are going to be changing the duty cycle far from 50%,
especially if you are hoping to use the sound card level controls to
control the stimulator level. Optoisolators are a lot simpler if they
only have to pass on/off signals, so it would be better to drive the
optoisolator from a comparator to insure a solid output, and just put
a level control knob on the stimulator.

If you really want to control the level with the sound card, you might
want to use the second stereo channel to do that, again feeding it
through a comparator and optoislator. Generate a pulse train on
that channel whose duty cycle is proportional to the desired level,
and then just filter the optoisolator output to get a DC control
signal for the stimulator.

The sound card should have no trouble producing signals in the 1 kHz
to 20 kHz range (using a 48000 Hz sample rate), but the output may be
reduced at the high end. That shouldn't be a problem if you are
feeding it to a comparator anyway.

SHAMELESS PLUG: You might want to look into the signal generator
features of my Daqarta software. You don't need to buy anything:
The generator is absolutely FREE, forever, even though certain other
features like input monitoring will stop working after the trial
period. You are welcome to use it that way as long as you like.
It has extensive pulse generation options, including the ability to
use Pulse Width Modulation, FM, AM, sweeps, bursts, etc.

Best regards,


Bob Masta

DAQARTA v4.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!

 

[jer0en]

I think you went wrong on the proportions. you probably mean 31 KVolts and
1.5ľA. you can test it quite comfortably on your tits.

 

[jer0en]

I had no idea that 1.5mA would be a peak value. in that case I would suggest
to increase voltage to 62 Kvolts and decrease current to 0.75 ľA, which is
also closer to safe standard values as used by other electrical LMRs.

LMR = large mammel restraint

 

[Gerard Bok]

On Tue, 15 Jul 2008 02:56:20 GMT, sal2 <sal2@sal2.com> wrote:

On Tue, 15 Jul 2008 00:11:44 +0200, jer0en wrote:

I think you went wrong on the proportions. you probably mean 31 KVolts
and 1.5ÂľA. you can test it quite comfortably on your tits.

That made me laugh hahahhaha becareful you don't want to singe your
nips ;-) no the specification are correct
output voltage 27 Volts to 31 Volts (from 54 Volts Peak-Peak, to 62 Volts
Peak-Peak). and
Output Current at : 1.0to 1.5 milliamps

With those requirements I would suggest to connect a simple mains
transformer, as found in many wall wards, in reverse to the
speaker output of your soundcard.
(You will need the old fashioned, 'heavy' type, not a modern
light weight switcher type for that.)

Open it to get access to the bare transformer inside (you don't
need the rectifiers and capacitors). Connect the low voltage
wires to your sound card. Use the 'mains' wires as output.

Simply set the 'volume control' on your PC such, that you get
some 31 volt for output.

--
Kind regards,
Gerard Bok

 

[Paul E. Schoen]

<Hamid.V.Ansari@gmail.com> wrote in message
news:25a4e3d0-7f34-4cf9-a873-95eadb4ee3db@r35g2000prm.googlegroups.com...

Before declaring his report he asked me by email for paying him the
expences of some experiments performed by him which he claimed are
in support of the prediction of my paper. I was not able to act as he
asked me,
and continue discussion about it in usenet. Finally this dear friend
decided
to publish his report in usent which I repeated it now. That is all,
without
anythig else. He insisted that I shoud perform necessary experiments
myself and analyse the results myself. Unfortunately neither then nor
even
now, contrary to my desire, my life has not defined
based on experimental or even theoretical scientific researches.
If interested in the subject you can perform similar experiments
at least to prove decisively that this prediction is wrong.

I, too, would demand payment up front to perform meaningless experiments
whose outcome is predictable and not what you want to see. And, for a much
higher price, I might be willing to report (falsified) findings that are
favorable to your assertations, but as that would completely destroy any
credibility I might have, it would be a very high price indeed.

But the experiment you describe is not that difficult to do. As described
elsewhere, you can just read the capacitance of a multiple plate air tuning
capacitor, insert dielectric sheets, and measure again. Capacitance will
increase. If there had been a charge on the plates, the voltage will
decrease. If you connect the capacitor to a battery, and insert the
dielectric, you can measure current flow out of the battery as you do so,
which means that the battery is acting as a source of potential. Now, if
you can charge the battery by performing this action, then you might say
the dielectric, or rather its motion caused by your application of external
force, is the source.

This is a perfect "mental experiment" as Einstein enjoyed doing, which
required nothing more than his mind and a solid basis in scientific
methods, facts, mathematics, and a good dose of imagination. He also
regularly smoked a pipe. To make this mental experiment meet the OP's
expectations, something more than tobacco would be necessary!

Paul

 

[gcd]

fom the replies - sounds more like you may have a flakey programmer, or you
tried to program it with the wrong algorithm and put 21v on a 12.5v
programming line.

Greg

"orange" <orange47@gmail.com> wrote in message
news:7892da14-676c-45f9-a973-cf55c99f2036@d1g2000hsg.googlegroups.com...

well I've done it, I apparently overexposed the EPROM (27c400) by UV
lamp. (now I know there is such thing)

is there any way to repair it or should I just throw it away?

I'm using Willem programmer ver3 with 12V power supply.

 

[Jon Slaughter]

"sal2" <sal2@sal2.com> wrote in message
newsan.2008.08.25.15.25.30@sal2.com...

Greetings All

Can someone recommend a good software program that can do audio frequency
sweeps through the computer sound card, without me having to type in and
test each frequency separately.

Example: Play 10hz to 20,000hz incrementing by 1 Hz over 15 seconds time
span

just download a wave file that does it? You can even make one with matlab or
some programming software if you got it? There are many "diagnostic" wave
files online to download. It would be your easiest method rather than
installing some software.

 

[Bob Masta]

On Mon, 25 Aug 2008 15:25:28 GMT, sal2 <sal2@sal2.com> wrote:

Greetings All

Can someone recommend a good software program that can do audio frequency
sweeps through the computer sound card, without me having to type in and
test each frequency separately.

Example: Play 10hz to 20,000hz incrementing by 1 Hz over 15 seconds time
span

My Daqarta software can do that with ease. Download (see sig) and install it.
(It's absolutely FREE, forever, if you only need the signal gnerator.)
When it starts up, it will create a 400 Hz sine by default when you toggle
Generator on. To change that, click on Waveform Controls and then Sweep.
In the Sweep dialog you can set Start and End frequencies, and Length in samples
or seconds.

That will give a smooth continuous sweep, lasting Length duration, which you can
set to Linear or Exponential. To get steps, click the Stairs button. If you
have set Start to 10 Hz and End to 20000, the Stairs window will show 19990
steps. However, in Stairs mode the Length value is the time spent at *each*
step, so in your case you would set it to 15/19990 = 750 usec. (You can enter
'750u' instead of '0.000750' for this.)

Note, however, that 750 usec is not a lot of time to hold at a single
frequency... only 36 samples at 48000 samples per sec. You might be better off
with a smooth sweep in this case. If you are going to use this to measure a
frequency response, make sure your analyzer can respond adequately.
If you use Daqarta for this (see below), you should set the Spectrum Window
to Flat Top. But there is a much better way, which is to use no window function
but set Daqarta so that it only steps to each spectral line. This insures that
the spectrum will have no spectral leakage. See the Frequency Sweep Stairs topic
in Help (right-click on the Stairs control), or at
<http://www.daqarta.com/dw_ee0s.htm>.

Note that although the Generator is free, if you want to analyze input signals
after the 30-day/30-session trial period you will need to buy a license (US$29
for personal use).

If you have any questions about Daqarta, or frequency response measurement, or
anything related to data acquisition, please feel free to use the contact form
on the site.

Best regards,


Bob Masta

DAQARTA v4.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!

 

[Pipedown]

Well, there's advertising a mass market product and then there is a guy
trying to offer his collection of old magazines to an interested group.
This guy isn't going to pay off his mortgage with $10. Have a little
flexibility, a single post to a single NG isn't quite SPAM (even if
potentially unwanted). OTOH, we don't want every electronics eBay auction
posted here either.

To the OP, try the web-forum for Nuts&Volts magazine, there are people who
want your mags and a section to properly post your offer.


"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:AJSdnafCbJ4qzCjVnZ2dnUVZ_hKdnZ2d@earthlink.com...

walt wrote:


Advertising is not allowed on any of the sci.electronics.*
newsgroups. A separate newsgroup was created for advertising.

news:misc.industry.electronics.marketplace


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your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Pipedown]

Okay, well he posted once before


"Pipedown" <pipedown@nowhere.net> wrote in message
news:3Lzxk.25318$N87.17943@nlpi068.nbdc.sbc.com...

Well, there's advertising a mass market product and then there is a guy
trying to offer his collection of old magazines to an interested group.
This guy isn't going to pay off his mortgage with $10. Have a little
flexibility, a single post to a single NG isn't quite SPAM (even if
potentially unwanted). OTOH, we don't want every electronics eBay auction
posted here either.

To the OP, try the web-forum for Nuts&Volts magazine, there are people who
want your mags and a section to properly post your offer.


"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:AJSdnafCbJ4qzCjVnZ2dnUVZ_hKdnZ2d@earthlink.com...

walt wrote:


Advertising is not allowed on any of the sci.electronics.*
newsgroups. A separate newsgroup was created for advertising.

news:misc.industry.electronics.marketplace


--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Woody]

Peter.Hiscocks@gmail.com <Peter.Hiscocks@gmail.com> wrote:

This is Newsletter #8 of the Open Instrumentation Project.

The OIP makes open-source software and economical high-technology
instrumentation hardware for students, hobbiests, engineers and
scientists.
Current instruments include oscilloscope (with spectrum analysis),
arbitrary/function waveform generator and Bode Plot network analyser.

Details of the project, hardware and software are at
www.syscompdesign.com

ok, as you have crossposted to where I am and after looking at your
website, am I right in assuming that the 'open instrumentation project'
is purely a software project, ie, open source software to your closed
hardware, or are the circuit diagrams for the hardware anywhere?

I mean still quite interesting anyway, but presumably then this is more
a commercial announcment?
Or am I missing something?


--
Woody
Alienrat Design Ltd

 

[Rowland McDonnell]

John Fields <jfields@austininstruments.com> wrote:

"Peter.Hiscocks@gmail.com" <Peter.Hiscocks@gmail.com> wrote:

This is Newsletter #8 of the Open Instrumentation Project.

The OIP makes open-source software and economical high-technology
instrumentation hardware for students, hobbiests, engineers and
scientists.

---
Hobbyists?

No, this spammer clearly means the people who are most hobbi.

Rowland.

--
Remove the animal for email address: rowland.mcdonnell@dog.physics.org
Sorry - the spam got to me
http://www.mag-uk.org http://www.bmf.co.uk
UK biker? Join MAG and the BMF and stop the Eurocrats banning biking

 

[Woody]

John Fields <jfields@austininstruments.com> wrote:

On Thu, 18 Sep 2008 13:27:32 -0700 (PDT), "Peter.Hiscocks@gmail.com"
Peter.Hiscocks@gmail.com> wrote:

This is Newsletter #8 of the Open Instrumentation Project.

The OIP makes open-source software and economical high-technology
instrumentation hardware for students, hobbiests, engineers and
scientists.

---
Hobbyists?

Hobbits?

--
Woody
Alienrat Design Ltd