Category Archives: hardware

The physical construction of io.

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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enclosures: patch panel

By Han-earl Park | Published: September 19, 2008

One of the, again, less glamorous, but practical elements of io 0.0.1 beta++ is the patch panel. The panel holds the connectors that need to be accessed frequently (with the exception of the audio inputs to the pitch-to-MIDI converters since they already reside on the front panels). The connectors are, from left to right, IEC [...]

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enclosures: pre-amp and power supply panels (physical artifacts)

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

As an update to the previous post, here’re photos of the machined and loaded panels. The front panel holds, from left to right, the power switch, 4 LED indicators (+15V, +12V, -12V and +9V), two filter bypass switches and two output level pots. The rear panel holds, from left to right, stereo audio inputs (unbalanced), [...]

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enclosures: pre-amp and power supply panels

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

One handy box that forms a crucial (if unglamorous) part of io 0.0.1 beta++ contains the audio preamp (basically, a couple of filters, signal amplifiers and a balanced line driver) and power supply/distribution components (9V, ±12V). I don’t have a name for this box yet, but here are the layouts for the front and rear [...]

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enclosures: rack spaces

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

Rackmount components: 2U or 3U?

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schedule 0.0.1

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

Okay, let’s quickly revise the proposed timetable by shifting the start back by four months (i.e. to the present), deleting one of the breaks, repositioning the other, and see what we get. intermediate objectives (projected) initial design phase: january 2008– Software: design, preliminary implementation and testing of software components. Analog electronics: design and testing. alpha [...]

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schedule 0.0.0

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

This is/was the timescale as proposed in the grant application. With the (then unforeseen) delays of the funding process, all this will need to be revised. intermediate objectives (projected) initial design phase: september 2007– Software: design, preliminary implementation and testing of software components. Analog electronics: design and testing. break: november 2007 alpha build: february 2008 [...]

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