fun with the oscilloscope
here are some videos of audio out of the computer plugged directly into the oscilloscope. red/right is
plugged into x and black/left is plugged into y (backwards, i know). the links are either "no math" (just x and y shown) or
"xy" (x and y along with a third line that is xy). the sound isn't very good, but it's better than
nothing...
 the gambler, kenny rogers (xy)
 james bond theme (xy)
(no math)
 killing machine, my regrets (90 sec, no math)
 eye of the tiger, survivor (xy)
 paradise city, guns n roses (xy)
(90 sec, no math)
 welcome to the jungle, guns n roses (90sec, no math)
 everybody knows, leonard cohen (xy)
 fight for you right, beastie boys (xy)
i figured out how to grab screen shots, so here are a few pictures too...
 x at 120V A/C and y at 120V A/C with xy
 x at 120V A/C and y at 60V A/C with xy
(60V via a diode)
 x at 120V A/C and y at ~1.8V DC with a cap
(it's a rectifier with a capacitive filter)
the lissajous curve:
to do this i plugged the audio cable into the oscilloscope (black left, red right), set it to xy mode, set the
x and y voltage to 200mv and time to 250 kSa. here are the sound files played (created with
audacity) and a few
pictures to go with them:
 the 1:2 (left 440 Hz, right 880 Hz) and the mp3
 the reverse (2:1, left 880 Hz, right 440 Hz) and the mp3
 the 3:4 (left 1320 Hz, right 1760 Hz) and the mp3
 the reverse (left 1760, right 1320) and the mp3
 a circle (left 440.2, right 440.2 time shifted) and the mp3

