I knew somebody had done it.

BTW, the link you sent was really interesting, but didn't seem to have much
to do with a scope.
--Lawrence

----- Original Message -----
From: "Dal Wheeler" <dwheeler@insightek.net>
To: "Lawrence Lile" <llile@toastmaster.com>
Sent: Wednesday, February 06, 2002 12:42 PM
Subject: Re: [EE]:Oscilloscope


> Doesn't this sound like the Bitoscope project?
>
> I thought about rolling my own someday too though...
> Something roughly like this: (only faster)
> http://www.techmind.org/vd/mk1/vdescrpt.html
> Slap a different trigger on it; higher clock and smaller buffer, multiple
> similtaneous channels, 8 fast comparitors into an extra FIFO,No fpga on
> it...?
>
> :')
>
>
> ----- Original Message -----
> From: Lawrence Lile <llile@TOASTMASTER.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Wednesday, February 06, 2002 10:37 AM
> Subject: Re: [EE]:Oscilloscope
>
>
> > Maybe un-useful, but one I have thought of often.  Here's my thinking:
> > Forget trying to get high speed analog signals into your PC.  Have an
> > external box that captures the waveform, scales it, isolates it from
your
> > precious PC's ground and power supply, and also scales it in the time
> > dinemsion, and wraps a nice ground plane around it..  Jam a bitstream
into
> > whatever port is easy - RS232, parrallel, or USB (if it were a
commercial
> > product USB would be the way to go) and use the PC's megabytes of memory
> for
> > the digital storage, use the PC's powqerful graphics for the display,
and
> > use the brain for things like displaying the RMS value as a digital
> > voltmeter, counting the frequency, counting the pulse width, all the
> things
> > that take a lot of squinting or guessing on an old analog scope.  At
least
> 4
> > channels, plus a few logic channels like an HP mixed signal scope.
> >
> > Now if we are going to measure signals in the megahertz range, we are
out
> of
> > the PIC's league.  How do TEK and the other big boys achieve A/D
> conversion
> > in a 100 mHz scope?
> >
> > keep in mind this is just an interesting mental excercise - I'm not
> planning
> > on building this anytime soon.  Besides, they already make them.
> >
> > --Lawrence
>
>

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