USB digital scope

[John Smith]

[usual "come back to reality" chit]

Or, to put it simply, with a wide-band rf-amp, a high bandwidth opamp
and a few ic's interfaced on a USB bus to my computer, I have the
equivalent of a thousands-of-dollars-oscilloscope-of-the-90's ... all
for a VERY CHEAP price!

VERY CHEAP price usually = VERY CHEAP performance.

The front end electronics is the SAME for a PC based DSO as it is for
a real bench oscilloscope, or didn't you know that?
You still need the ultra flat frequency and phase response, the large
input range attenuator, the low noise floor, the trigger circuitry
etc, etc if you want a good performance oscilloscope.
...
Dave.

For starters, ever heard of negative feedback and how to use it to
control gain ... but then, you already knew that, didn't you?

Ever heard of "programmable gain amps." Etc., etc. ...

The problems in design/construction can be as simple/difficult as you
choose to make 'em. Nothing along these simple design specs you list
comes even close to impossible, nor even of great difficulty ...

No wonder "they" have gone offshore, seems a chit-load here has become
dumb-struck!

Regards,
JS

 

[John Smith]

...
I recently got the SO a 1.5 karat white gold ring. It was $800 and most
of the cost was the gold in the setting.

The diamond is absolutely flawless. I know DeBeers got scared that you
cannot tell the difference between their diamonds and the synthetics so
they started laser etching their logo into the natural diamonds.

Apparently they didn't feel their diamonds were already flawed enough?
<LOL>

Regards,
JS

 

[John Smith]

...
I recently got the SO a 1.5 karat white gold ring. It was $800 and most
of the cost was the gold in the setting.

The diamond is absolutely flawless. I know DeBeers got scared that you
cannot tell the difference between their diamonds and the synthetics so
they started laser etching their logo into the natural diamonds.

Yeah, with the developments in "synthetic diamonds" (they are just as
real as REAL diamonds), it may become traditional to give the little
lady a solid diamond cutting board as opposed to a ring. :-D

Regards,
JS

 

[[email protected]]

Yes I was aware of that, it's how they managed to make the things in the
first place.

By burning charcoal? You're inbred.

 

[[email protected]]

Ever heard of "programmable gain amps." Etc., etc. ...

The problems in design/construction can be as simple/difficult as you
choose to make 'em. Nothing along these simple design specs you list
comes even close to impossible, nor even of great difficulty ...

No wonder "they" have gone offshore, seems a chit-load here has become
dumb-struck!

Regards,
JS

Fantastic, it's so easy! When can I buy your 4GHz USB sampling scope?
Hell, with negative feedback, you can get 100GHz! It's SO simple!
(smacks forehead)

Regards,
A non-inbred person

 

[T]

[email protected]>, [email protected]
says...

By burning charcoal? You're inbred.

Well, by heating it and compressing it.

Nice little ad hominem attack!

 

[John Smith]

[...]
Regards,
A non-inbred person

PLONK! Another idiot goes down the tube ...

JS

 

[Nico Coesel]

Since when were we talking about diamonds?
I thought we were talking electronic test equipment here...


No, but when it comes to test equipment it almost always IS.

If you are trying to say that a cheap no-name DSO (and the components
used in it) is any match for a more expensive name brand DSO, then you
are off with the fairies. You usually get what you pay for with test
equipment.

Perhaps, but all the entry model equipment is made in China and
re-branded by the big guys.

 

[[email protected]]

[email protected]>, [email protected]
says...



Well, by heating it and compressing it.

That's "burning"?

Nice little ad hominem attack!

I didn't even try, my heart wasn't in it.

 

[[email protected]]

What about triggering and sampling rate? real-time or equivalent?, or
a combo of both? Pre and post triggering? Trigger level control and
filtering?

Dave.

I like you. I don't know about you, but I'm eagerly waiting for John
Smith's USB scope.
Man, I'm so pumped I might build one on the way home tonight. It's so
simple!
And then I'll burn some charcoal, apparently this is how diamonds are
made.
I didn't know kebabs could make me rich as well as fat.