audio:audio_by_van_alstine_work
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audio:audio_by_van_alstine_work [2019/05/22 04:27] – [Vision DAC improved] mithat | audio:audio_by_van_alstine_work [2019/08/02 21:30] – [RB-RC] mithat | ||
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====== Audio by Van Alstine work ====== | ====== Audio by Van Alstine work ====== | ||
- | I have done quite a bit of consulting work for [[https:// | + | I have done quite a bit of consulting work for [[https:// |
The focus of my work with AVA has always been to bring the highest standards of audio engineering to the company while fostering a more generous, considered, and inclusive view of the industry and its consumers. | The focus of my work with AVA has always been to bring the highest standards of audio engineering to the company while fostering a more generous, considered, and inclusive view of the industry and its consumers. | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | New vacuum tube line stage to replace AVA’s existing design originally derived from the Dyna PAS 3. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | Low-cost hybrid line stage using a computer-optimized 12AT7A gain stage and integrated circuit buffer output. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | 12AT7A-based premium hybrid line stage using a computer-optimized 12AT7A gain stage and optimized power-MOSFET buffer output stage. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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c. 2002 | c. 2002 | ||
- | **Contribution: | + | All-tube buffered line stage using a computer-optimized 12AT7A gain stage and 12AU7 buffer stage. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | All-new power high-voltage supply regulation circuits for use with all AVA tube and hybrid products. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | Remote controlled volume circuit adaptable to all existing AVA preamplifiers. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | Revision of AVA’s low-power tube amplifier circuits for the Dyna ST70 chassis. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | Next-generation S/PDIF decoder and DAC board |
- | **Discussion:** In the mid-1990s, I built AVA a prototype stand-alone DAC that demonstrated to them that producing such a product was within their manufacturing abilities. This ushered in an era of their being able to offer a product that they had previously considered impossible. So it was probably natural that they approached me to design the core circuits that would be used in their next generation of stand-alone DACs. They had preselected the the Wolfson WM8740 as the DAC IC they wanted the design based around, but by the time the design was completed we had moved to the WM8742. | + | **Contribution:** Design and implementation. |
- | AVA originally wanted to support only 44.1kHz PCM formats and a single coaxial S/PDIF input. Additionally, | + | **Discussion: |
+ | |||
+ | AVA originally wanted to support only 44.1kHz PCM formats and a single coaxial S/PDIF input. Additionally, | ||
This would be the first time AVA would use predominantly SMD parts in a PCB design. The previous generation DAC had used a single hand-soldered SOIC package. This design used SMD components exclusively. | This would be the first time AVA would use predominantly SMD parts in a PCB design. The previous generation DAC had used a single hand-soldered SOIC package. This design used SMD components exclusively. | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | All-tube, next-generation premium preamp line stage. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | Component value selection for best RIAA conformance. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== Vision DAC improved ===== | ===== Vision DAC improved ===== | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | New reconstruction and output stage based on a discrete, class-A, solid-state gain stage I developed as an independent project. |
+ | |||
+ | **Contribution: | ||
- | **Discussion: | + | **Discussion: |
===== Vision SL improved ===== | ===== Vision SL improved ===== | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | New line stage based on a discrete, class-A, solid-state gain stage I developed as an independent project. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | All-new DAC product with USB and S/PDIF inputs supporting high-rate PCM and DSD formats. |
+ | |||
+ | **Contribution: | ||
- | **Discussion: | + | **Discussion: |
- | Working | + | Working with application engineers at AKM, I developed |
- | This would be the first time AVA would use in-house | + | This would be the first design that required |
===== Vision SLR, Fet Valve CFR ===== | ===== Vision SLR, Fet Valve CFR ===== | ||
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[[https:// | [[https:// | ||
- | **Contribution: | + | Fully remote-controllable chassis and supporting circuitry. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== RB-RC ===== | ===== RB-RC ===== | ||
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c. 2018 | c. 2018 | ||
- | **Contribution: | + | Low-cost remote controlled volume circuit adaptable to AVA' |
- | **Discussion:** With the availability of a less costly remote control transmitter option that I established for the SLR and CFR chassis as well as the newly founded ability for AVA to burn custom microcontrollers in house, it was natural to apply these toward stripped-down remote control functionality for their RB (Real Basic) preamplifer chassis. The new design replaced the previous volume-only remote control | + | **Contribution:** Concept origination, |
- | ===== The future ===== | + | **Discussion: |
- | I continue to provide consulting services to Audio by Van Alstine, particularly in the areas of digital audio, small-signal analog audio, low-power power amplifier design, and user interface design. My design interests lie in bringing greater equity to the availability and usability of high-performance audio equipment and in improving user experiences in every stage of product use. My cultural interests lie in facilitating more generous and inclusive approaches to end-user and business interactions. I try to bring all these interest to bear as much as possible in my work for AVA and hope to produce solutions that increasingly embody them. | + | ===== The future ===== |
+ | I continue to provide consulting services to Audio by Van Alstine, particularly in the areas of digital audio, small-signal analog audio, low-power amplifier design, and user interface design. Within audio, my work focuses on developing solutions that represent true audio progress rather than producing colored signatures that happen to be fashionable. On a more general level, my design interests include a desire to bring greater equity to technological realms and to improve user experiences in every stage of product use. I try to bring all this to bear as much as possible in my work for AVA. | ||
audio/audio_by_van_alstine_work.txt · Last modified: 2023/01/02 21:54 by mithat