A good digital oscilloscope?

Dec 06, 2009 375 Replies

On a sunny day (Tue, 08 Dec 2009 18:18:50 -0800) it happened John Larkin wrote in :

Many decennia ago, and this also touches on that Tek patent for input isolation that uses a modulated carrier via a transformer, I had a big Philips tube color TV. I also had their first video recorder, a tape recorder with 1/2 inch tape IIRC. As tube TVs in that time has no mains isolation, chassis always live, Philips provided a little box with that recorder, it consisted of a 38 MHz (or there about, basically TV IF) video modulator. The box went into the TV, connected to the IF via a relay IIRC, and provided it with a floating video + audio input. That was one thing, and predated the Tek patent by say, it was from 1968, Tek's applied 2002, makes 34 years YES THIRTY FOUR YEARS. But now the clue, as related to this. To display some waveforms on that big color TV screen (well 61 cm was big in that time), I designed a little circuit, it looks like this: ftp://panteltje.com/pub/TV_scope_img_1679.jpg What is does is create a dot on the TV screen that can be moved in X and Y direction. the 2 window comparators compare the H and V ramp against an X and Y DC voltage. The size of the dot is set by the width of the windows, so a square dot.

When you only use the V comparator, you would get a horizontal line displayed on the TV as set by the Vpos pot. If you put a *signal* on the Vpos pot, you would see the waveform as with a 64 uS timebase... So, if you tested signals that were related to the TV H sync, the display would be rock solid. I used BFY90 transistors to make fast window comparators, and you cloud easily see the spikes on the output of a TTL gate in a 500 kHz signal (is 32 x 15625 Hz). Beautiful, and if course that Philips IF modulator box provided the needed 100% isolation :-)

So, Tek people, here is your prior art, the Philips recorder was the LDL 1000. And here is my prior art to use it as a scope, think I could produce some witnesses who did see it in operation in my place. KIllall patent trolls kill kill kill kill kill kill kill

Bigger smile! I never wear ties!

Well, maybe for weddings and funerals.

John

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Most of these "outrageous" patents really aren't outrageous--when you carefully read the claims you find they're patenting one very specific, exact configuration, only that configuration, and nothing else.

This one? Appears to be genuinely outrageous. :-)

-- Cheers, James Arthur

On a sunny day (Thu, 10 Dec 2009 08:52:57 -0800 (PST)) it happened snipped-for-privacy@yahoo.com wrote in :

Lots of companies are being 'milked' for money by trolls holding patents like this, patents that are formulated in such a general way that they cover everything. Recently new claims were made against Apple:

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Thsi is the patent it is all about:
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So, basically all cellphone makes that have a camera.... They have made millions so far, bough the patents for 100.000$, just a couple of evil lawyers. I have no tread all of this yet, but it gives some more info on patent trolls and their ways:
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God beware that those mosquitos ever get an entry in the world of 'software patents'. That would kill any innovation in IT by small companies. No to software patents! Oops, is that sentence patented?

I wonder if the phosphorescence of that radium compound has anything to do with the radium's radioactivity. Maybe the radioactivity helps to get the energy into or back out of the long-term storage states.

robert

I don't think there's methanol in it.

robert

On a sunny day (10 Dec 2009 17:34:26 GMT) it happened Robert Latest wrote in :

Spiritus has it written on the bottle, contains:

85 % Ethanol max 3 % Methanol.

Vodka I dunno, LOL.

Probably not, but maybe copyrighted. ;-)

What that means is, whatever money you make off of it, you have to pay the copyright owner. ;-)

Cheers! Rich

In the US, it's called "denatured alcohol," and has warnings all over the container "Caution - can not be made nonpoisonous" or some such.

Vodka is 80 proof, which is 40% - in some states you can get "grain alcohol" which is 95% ethanol, or 190 proof, which is as pure as it can be distilled, since a 95%-5% mix is has the lowest boiling point of any mixture of ethanol and water.

I tried some "Everclear grain alcohol" once that I got in a liquor store in Hudson, WI, 190 proof, and if you drink a small enough amount (like half a normal shot in your drink), it's a pretty awesome buzz, but you have to be very careful with it. :-)

Cheers! Rich

Of course it does. Radium phosphors will glow in the dark for centuries. That's what the radium is for. Tritium too, except its half-life is around 12 years.

John

Back when I started at Microsim, I decided to wear a full three piece suit the first week, and then step it down each week till I was in the usual jeans and tee shirt. My first week, they were having the annual stockholders meeting, and since I was new, I didn't have any responsibilities to keep me out of it, so I went with my boss.

Everyone at the meeting kept wondering who the 'banker' was!

I still strongly suspect that the respect that I had at the company might have begun there, where everyone subconsciously remembered me as a 'suit!' ;-)

Charlie

Only a little... I think that $250-$500 per kid for Xmas today is not at all uncommon today...

I doubt you can legally work at a meat factory unless you're at least 18 today. :-(

If you want to see some kids with wealthy parents who are *seriously* spoiled, check this out:

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. It's not uncommon on that show for the parents to blow $25-$100k on their kid's 16th birthday!

If I had the choice between a Lexus and, I dunno, a Civic and a bunch of test equipment, I think it'd be obvious which I'd choose...

---Joel

We moved back in with the folks twice - each time for about two weeks. The first, I had just graduated college and first moved to California. Stayed at my parents while we got jobs and an apartment, maybe two to three weeks.

The second time was about 10 years later, and we tried to move to Memphis. Stayed with her folds this time for about three weeks, while I lined up a job and an apartment and tried to get into UofM. Had been there just over a month when I finally got an appointment with the dean of electrical engineering, and found out that there was no chance of getting into UofM, so it was back to California!

Charlie

I left home when I was 18 and never went back.

Our kids were all permanently gone at some point from beginning college to graduating.

Of course we now have a record bad economy, with high school AND college grads unable to find work. ...Jim Thompson

| James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Help save the environment! Please dispose of socialism properly!

When I started out a coat and tie were required. A few years later the AC broke down so they lifted the tie requirement for the summer. I never wore one again, even for a major awards program. ;-)

I wear one once a year.

Last year the kid got married and my mother died. No tie, at least so far, this year.

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If I just save the "screen shot" it doesn't save any settings. The file can be read back into the scope and the trace restored into whatever setting are there. IOW, useless.

The alternative is to dump memory to a CSV, all 64K samples. That amounts to ~300KB.

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Photograph the screen, along with any post-its you have plastered around the edge.

I like the photo look better than the data dump. It looks more authentic.

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John

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Ick! It's difficult to manipulate the data on the photograph.

Funny, most people trust anything a computer dumps out. ;-)

I remember back in the 60's and 70's that there was the occasional warning not to wear a wrist watch "upside down" because it's then too close to your reproductive functions when having the hand in a pocket.

Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.

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