On Mon, Mar 23, 2009 at 01:55:33PM -0700, [email protected] wrote: > > From: "Ben Okopnik" <[email protected]> > > High quality/low cost solution: Linux + "xoscope" program + 1 stereo > > plug + 2 resistors for a voltage divider. Total cost: about $3 if you > > have to buy the plug and the resistors, free otherwise. If you want to > > get really fancy (i.e., have an actual functioning audio-frequency > > oscilloscope), you'd have to spend about $20 to build an input buffer > > like this one: > > > http://xoscope.sourceforge.net/hardware/buff.gif > > That uses half of a TLO82 chip. Any issues with cross channel talk if you > use the other half for a second input channel?
Searching Google for 'TL082 CMRR' (i.e., the common-mode rejection ratio) returns over 1500 hits, with the first one having "Super High CMRR" right in the search results. :) JFET-based op-amps are well known for excellent cross-channel isolation. -- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET * _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
