Category Archives: hardware

The physical construction of io.

analog io

By Han-earl Park | Published: June 29, 2009

I’ve assumed that future versions of io would have a single board computer (or multiple SBCs) in place of the clunky and fragile personal computer. There was, however, always an alternative. Take the not-so-humble analog computer, a technology with a fascinating past and a (still promising) future. Given that io’s behavior is driven by an […]

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beta test 05-12-09: audio recordings

By Han-earl Park | Published: May 25, 2009

Here is the audio documentation of the io++ beta test with Bruce Coates on May 12th 2009. beta test 05-12-09_00 [mp3″] beta test 05-12-09_01 [mp3″] beta test 05-12-09_02 [mp3″] beta test 05-12-09_03 [mp3″] beta test 05-12-09_04 [mp3″] beta test 05-12-09_05 [mp3″] beta test 05-12-09_06 [mp3″] beta test 05-12-09_07 [mp3″] beta test 05-12-09_08 [mp3″] beta test […]

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shapes of io++ to come 04/05-09

By Han-earl Park | Published: May 8, 2009
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beta test 03-26-09: audio recordings

By Han-earl Park | Published: March 30, 2009

Here is the (not yet annotated) audio documentation of the io++ beta test with Franziska Schroeder on March 26th 2009. beta test 03-26-09_00 [mp3″] beta test 03-26-09_01 [mp3″] beta test 03-26-09_02 [mp3″] beta test 03-26-09_03 [mp3″] beta test 03-26-09_04 [mp3″] beta test 03-26-09_05 [mp3″] beta test 03-26-09_06 [mp3″] Performers are io 0.0.1 beta++ (itself) and […]

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beta test 12-08-08: audio recordings

By Han-earl Park | Published: December 15, 2008

I will be returning with more detailed reports shortly, but, in the meantime, here is the (not yet annotated) audio documentation of the io++ beta test with Bruce Coates on December 8th 2008. beta test 12-08-08_00 [mp3″] beta test 12-08-08_01 [mp3″] beta test 12-08-08_02 [mp3″] beta test 12-08-08_03 [mp3″] beta test 12-08-08_04 [mp3″] beta test […]

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beta test 11-10-08: audio recordings

By Han-earl Park | Published: November 16, 2008

I will be returning with more detailed reports within the coming days, but, in the meantime, here is the audio documentation of the io++ beta test with Franziska Schroeder on November 10th 2008. beta test 11-10-08_00 [mp3″] beta test 11-10-08_01 [mp3″] beta test 11-10-08_02 [mp3″] beta test 11-10-08_03 [mp3″] beta test 11-10-08_04 [mp3″] beta test […]

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beta test 11-10-08 with Franziska Schroeder

By Han-earl Park | Published: November 5, 2008

The first beta test (which, in some respects, is more of an alpha test) is scheduled to start on Monday, November 10th 2008. Saxophonist, improviser, theorist and veteran of technological arts, Franziska Schroeder will be working with io++ (or components that will make up that machine), and we’ll see more clearly what work needs to […]

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rack wiring: 8-pin mini DIN angst

By Han-earl Park | Published: October 22, 2008

Almost completed the wiring of the rack (except the patch panel foot switch connectors which I am leaving for the moment). No problem with the XLR connectors, quarter inch phones, MIDI cables, barrel connectors… then I hit a major snag with the 8-pin mini DIN panel socket for the Mac serial connector. Too small, too […]

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rack: loaded and powered up

By Han-earl Park | Published: October 21, 2008

Here’s the test of the power supply and the power inlet of the patch panel.

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enclosure and power supply (intermediate version)

By Han-earl Park | Published: October 18, 2008

Here’s photos of the intermediate version of the power supply in its enclosure. The front of the unit is at the top of the image, and the back is at the bottom. You’re also looking up at the the unit in these photos. Power switch and LED indicators are at the top left of the […]

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power supply (early version)

By Han-earl Park | Published: October 12, 2008

The power supply has to provide, at a minimum, 0.7A @ +12V for the VL70m (power consumption measured at 0.6A @ 13.1V), and 1.3A @ +9V for the pitch-to-MIDI converters (GI-10: 0.26A @ 10.2V; GI-20: 0.8A @ 11.3V). Eventually, it will also provide bipolar power for the pre-amplifier (±12V or ±15V likely created using a […]

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pre-amp outline

By Han-earl Park | Published: October 3, 2008

The old version of io connected the output of the synthesizer directly to the amplifier. [see: figure] This wasn’t too much of a problem since, though unbalanced, the signal was low-impedance, line-level. There were, however, a couple of less desirable aspects to this. One was that the drivers (the woofer and the tweeter) would not […]

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