Date: Mon, 28 Feb 2011 13:45:26

Author: Thomas J. Bauer

Subject: Re: PC Use as Oscilloscope

Post:

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Brian,
That looks good. I see that the inputs a limited to +/- 20V. This should
be fine for most aplications on the lab bench, but what happens when
someone plug into the AC line? Does it blow the USB port on the
computer or just sometine on the USB stick?

Tom Bauer
Physics Department
Wellesley College


tap-l@lists.ncsu.edu writes:
>For $140, the USB Oscilloscope by Parallax is by far the best deal out
>there. It produces clean traces and their software works just like a
>regular scope.
>
>I bought one for troubleshooting digital circuits in our robotics
>program, and it's great for seeing PWM signals produced by our
>microcontrollers.
>
>[
>http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/oscilloscope/List/0/SortField/4/ProductID/46/Default.aspx
>]http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/oscilloscope/List/0/SortField/4/ProductID/46/Default.aspx
>
>-Brian
>Overland HS
>Aurora, CO
>
>On Mon, Feb 28, 2011 at 8:00 AM, wmcnairy <[
>mailto:wmcnairy@bellsouth.net ]wmcnairy@bellsouth.net> wrote:
>
>
>
>Hi Tappers!
>
>I've heard some threads discussing use of a laptop to drive a speaker
>with different waveforms.
>
>I'd like for students to be able to take data using the sound input and
>analyze it on an oscilloscope type input. We have Logger Pro, so
>perhaps it could do FFT of the data, but an oscilloscope would give 'real
>time' image of input.
>
>I believe, however, that the microphone input on PC's has a very limited
>voltage range, and can go 20-20,000 Hz. Any ideas for a simple, cheap
>make or purchase interface that would work between a circuit and the
>computer? We're talking about teachers and students, so I'd prefer
>something that clips the signal below the maximum voltage input-- I'd
>hate to have to replace the motherboard in some kid's computer because we
>fried the sound card part of it.
>
>Thanks for any ideas on either the software or the hardware to make this
>happen!
>
>bill
>



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<=21DOCTYPE HTML PUBLIC =22-//W3C//DTD HTML 4.0 Transitional//EN=22>







Brian,
That looks good. I see that the inputs a =
limited to +/- 20V. This should be fine for most aplications on the lab ben=
ch, but what happens when someone plug into the AC line? Does it blow the U=
SB port on the
computer or just sometine on the USB stic=
k?

Tom Bauer
Physics Department
Wellesley College


tap-l=40lists.ncsu.edu writes:
For =24140, the USB Oscilloscope by Parallax is =
by far the best deal out there.=C2=A0 It produces clean traces and their so=
ftware works just like a regular scope.

I bought one for troubleshooting digital circuit=
s in our robotics program, and it's great for seeing PWM signals produced b=
y our microcontrollers.

http://www.parallax.com/S=
toreSearchResults/tabid/768/txtSearch/oscilloscope/List/0/SortField/4/Produ=
ctID/46/Default.aspx

-Brian
Overland HS
Aurora, CO

On Mon, Feb 28, 2011 at 8:00 AM, wmcnairy iry=40bellsouth.net> wrote:



Hi Tappers=21

I've heard some threads discus=
sing use of a laptop to drive a speaker with different waveforms.

I'd like for students to be ab=
le to take data using the sound input and analyze it on an oscilloscope typ=
e input.=C2=A0 We have Logger Pro, so perhaps it could do FFT of the data, =
but an oscilloscope would give 'real time' image of input.

I believe, however, that the m=
icrophone input on PC's has a very limited voltage range, and can go 20-20,=
000 Hz.=C2=A0 Any ideas for a simple, cheap make or purchase interface that=
would work between a circuit and the computer?=C2=A0 We're talking about t=
eachers and students, so I'd prefer something that clips the signal below t=
he maximum voltage input-- I'd hate to have to replace the motherboard in s=
ome kid's computer because we fried the sound card part of it.

Thanks for any ideas on either=
the software or the hardware to make this happen=21

bill






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