Tag Archives: electronics

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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