audio:audio_by_van_alstine_work
Differences
This shows you the differences between two versions of the page.
Next revision | Previous revisionNext revisionBoth sides next revision | ||
audio:audio_by_van_alstine_work [2019/05/22 04:29] – [Vision DAC improved] mithat | audio:audio_by_van_alstine_work [2020/01/02 18:03] – [The present] mithat | ||
---|---|---|---|
Line 1: | Line 1: | ||
====== 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 | + | The focus of my work with AVA has always been to bring the highest standards of audio engineering to the company while helping to foster |
===== Transcendence Five ===== | ===== Transcendence Five ===== | ||
Line 9: | Line 9: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | New vacuum tube line stage to replace AVA’s existing design originally derived from the Dyna PAS 3. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== Transcendence Six ===== | ===== Transcendence Six ===== | ||
Line 17: | Line 19: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | Low-cost hybrid line stage using a computer-optimized 12AT7A gain stage and integrated circuit buffer output. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== Transcendence Seven ===== | ===== Transcendence Seven ===== | ||
Line 25: | Line 29: | ||
[[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: |
===== "T7 CF" ===== | ===== "T7 CF" ===== | ||
Line 33: | Line 39: | ||
c. 2002 | c. 2002 | ||
- | **Contribution: | + | All-tube buffered line stage using a computer-optimized 12AT7A gain stage and 12AU7 buffer stage. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
Line 43: | Line 51: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | All-new power high-voltage supply regulation circuits for use with all AVA tube and hybrid products. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
Line 53: | Line 63: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | Remote controlled volume circuit adaptable to all existing AVA preamplifiers. |
+ | |||
+ | **Contribution: | ||
- | **Discussion: | + | **Discussion: |
- | My original | + | My expectation was that AVA would offer the remote as standard equipment on all “big body” preamplifiers. Instead it was offered as a relatively costly option, which they justified because the remote control transmitters were costly, which they were because of the small quantities they ordered them in, which was the case because remote control was offered only as an option. |
===== Ultimate 70 and Ultravalve power amplifiers ===== | ===== Ultimate 70 and Ultravalve power amplifiers ===== | ||
Line 63: | Line 75: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | Revision of AVA’s low-power tube amplifier circuits for the Dyna ST70 chassis. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== DAC core for Vision and Vision Hybrid DACs ===== | ===== DAC core for Vision and Vision Hybrid DACs ===== | ||
Line 71: | Line 85: | ||
[[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: |
- | 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 | + | AVA originally wanted to support only 44.1kHz PCM formats with 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 | ||
I was not involved in the development of the analog stages for the first DAC products using this board. However, I was responsible for the analog circuits found in the [[# | I was not involved in the development of the analog stages for the first DAC products using this board. However, I was responsible for the analog circuits found in the [[# | ||
Line 85: | Line 101: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | All-tube, next-generation premium preamp line stage. |
+ | |||
+ | **Contribution: | ||
**Discussion: | **Discussion: | ||
Line 93: | Line 111: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | Component value selection for best RIAA conformance. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== Vision DAC improved ===== | ===== Vision DAC improved ===== | ||
Line 101: | Line 121: | ||
[[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: | ||
Line 109: | Line 131: | ||
[[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: | ||
Line 117: | Line 141: | ||
[[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 ===== | ||
Line 129: | Line 155: | ||
[[https:// | [[https:// | ||
- | **Contribution: | + | Fully remote-controllable chassis and supporting circuitry. |
- | **Discussion: | + | **Contribution: |
+ | |||
+ | **Discussion: | ||
===== RB-RC ===== | ===== RB-RC ===== | ||
Line 137: | Line 165: | ||
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. | + | ===== The present ===== |
+ | |||
+ | 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. | ||
+ | |||
+ | ===== The future ===== | ||
+ | Within audio, my work focuses on developing solutions that represent meaningful audio progress rather than chasing coloration 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