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
"x-y" (x and y along with a third line that is x-y). the sound isn't very good, but it's better than
nothing...
- the gambler, kenny rogers (x-y)
- james bond theme (x-y)
(no math)
- killing machine, my regrets (90 sec, no math)
- eye of the tiger, survivor (x-y)
- paradise city, guns n roses (x-y)
(90 sec, no math)
- welcome to the jungle, guns n roses (90sec, no math)
- everybody knows, leonard cohen (x-y)
- fight for you right, beastie boys (x-y)
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 x-y
- x at 120V A/C and y at 60V A/C with x-y
(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 x-y 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
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