Pay attention to the maximum voltage. Many USB scopes max out at +/-10V, wh=
ich limits their usefulness.

My first scope was a beat-up Tektronics 465. The single shot option was esp=
ecially useful.

Sent from my phone

> On Sep 22, 2014, at 23:19, RussellMc <apptechnz@gmail.com> wrote:
>=20
>> On 23 September 2014 17:28, Joshua Shriver <jshriver@gmail.com> wrote:
> Anyone offering a deal for a college newbie?  Recommend a place
>> outside ebay to get (even) and old school oscilloscope?
>=20
> What bandwidth do you need (or want)?
>=20
> You can use a PC audio card for a rather low bandwidth version.
>=20
> I do not know what spec Arduino based ones off, but I recently saw a chea=
p
> ($15) DIY version using a DS PIC.
> With the limitation that it is USB output and needs a "PC" or similar to
> control and view its output
> It's essentially a DSPIC, a matchbox (optional) and not too much else. 1
> Ms/s x  2 channel or 20 Ms/s sampled.
>=20
>=20
> Right end of top row (so far here if you want an accompanying technical
> links black hole as well
>=20
>                     http://www.pinterest.com/russellmcmahon/tech/
>=20
> Or Instructables here
> http://www.instructables.com/id/DIY-USB-OSCILLOSCOPE-IN-A-MATCHBOX/
>=20
>=20
> Full circuit diagram here:
> http://cdn.instructables.com/FPT/SS69/HMEXX2QJ/FPTSS69HMEXX2QJ.MEDIUM.jpg
>=20
>=20
>    Russell
>=20
>=20
>=20
> Also possibly useful - he says:
>=20
> I present a "BEST OF CLASS", "Full-Featured"  DIY-USB OSCILLOSCOPE which =
is
> "Truly DIY".
>=20
> My aim is to provide a cheap  Digital-Storage-Oscilloscope for Students,
> Budding Engineers and the Hobbyist.
>=20
> This USB-Oscilloscope could be part of the laboratory equipment in
> educational establishments.
>=20
> *Build this DIY-Oscilloscope for just $15*
>=20
> I wish to acknowledge the inputs from the following designs which have le=
d
> to this optimized solution:
>=20
> DPScope SE - the simplest real oscilloscope/logic analyzer on the
> planet, by womai,
> http://www.instructables.com/id/DPScope-SE-the-simplest-real-oscilloscope=
logic-/
>=20
> DPScope - Build Your Own USB/PC-Based Oscilloscope,by womai
> http://www.instructables.com/id/DPScope-Build-Your-Own-USBPC-Based-Oscill=
oscope/
>=20
> LCS-1M - A Full-Featured, Low-Cost Hobby Oscilloscope,by womai
> http://www.instructables.com/id/LCS-1M-A-Full-Featured-Low-Cost-Hobby-Osc=
illosc/
>=20
> PC SOUND-CARD SCOPE INTERFACE FACILITATES DC RESTORATION, by me
> http://www.instructables.com/id/PC-SOUND-CARD-SCOPE-INTERFACE-FACILITATES=
-DC-RESTO/
>=20
> Universal Analog Hardware Testbench, by me
> http://www.instructables.com/id/Universal-Analog-Hardware-Testbench/
>=20
> Analog Experiments Anywhere,by me
> http://www.instructables.com/id/Analog-Experiments-Anywhere/
>=20
> Two-Channel PC Based Oscilloscope USB, by Gaurav Chaudhary
> http://www.circuitvalley.com/2011/07/two-channel-pcbased-oscilloscope-usb=
..html
>=20
> Responding to comments and suggestions from many members :
>=20
> I am sharing the micro-controller fuse *.Hex *file for the dsPIC30F2020.
>=20
> The Host PC software has been written in both 'Visual Basic.Net' and open
> source 'Python' providing a *cross-platform* GUI based solution for both
> Windows and Linux platforms.
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.