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Old 12th October 2009, 11:39 PM   #501
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Quote:
Originally Posted by AKSA View Post
The VAS is Toshiba 2SC3423,
Howdy Hugh,
That device is tough to get. Any in-production subs you can recommend?
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Old 13th October 2009, 01:02 AM   #502
AKSA is offline AKSA  Australia
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Not so hard, look here at Bdent.com
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Old 13th October 2009, 01:12 AM   #503
Sheldon is online now Sheldon  United States
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Hugh,

I think you should spec out #5 for the official version. Some folks will hack in other stuff anyway. I like the wall wart, if nothing else, because the cord is thinner.

All the rest should be on the board. They won't add much real estate and those options that aren't wanted or needed by the individual, can simple be left off, or bypassed. Again, here, I think Hugh should spec. the tone controls.

Sorry Nico, I wasn't faithful to your format. But I warned you of my weakness and you went ahead and used the word "compulsary", and in bold no less. Of course, you therefore have the full right to ignore all my off form (or in form, for that matter) comments.

Other than the board, I think that the best way to make this simple and attractive, is a complete, and easy to source BOM. If you can make the same part # do multiple duty, all the better. I also like screw on connectors for all parts not directly soldered to the board.

OK. On to the next project: The AKSA DIY RIAA "Chicken Skin" amp. (I don't have the Ry Cooder "Paris Texas" sound track, only a couple of his other soundtracks. But I've great majority of his albums, either record or CD, some both. One of my favorite artists.)
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Old 13th October 2009, 01:56 AM   #504
Bigun is offline Bigun  Canada
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My gosh, things have MOVED !!!


It's Thanksgiving in Canada, we celebrate a little earlier than in the US on account of the climate producing an earlier harvest. Well, food, day off work, wine and... you get the picture - I will have to play catch-up tomorrow
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Old 13th October 2009, 03:45 AM   #505
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Happy thanks giving to all Canadians
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Old 13th October 2009, 03:49 AM   #506
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Hello

Thank Nico

Gaetan
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Old 13th October 2009, 06:11 PM   #507
pooge is offline pooge  United States
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Originally Posted by MJL21193 View Post
Howdy Hugh,
That device is tough to get. Any in-production subs you can recommend?
I just ordered 100 of them in the Y grade, as well as 100 of its complement.

I will be a while in finding matches, and will offer them for sale when I can get this done.
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Old 13th October 2009, 09:35 PM   #508
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I'm glad this is moving along.

This is a very helpful experience for me since I'm planning on prototyping a unique class A headphone amp if I ever stop simulating it.

- keantoken
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Old 13th October 2009, 09:42 PM   #509
AKSA is offline AKSA  Australia
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Thanks Pooge, much appreciated. Bdent.com is a good source of unusual semis at a reasonable price, and I have found this transistor as a VAS to be absolutely outstanding.

Progress to date.....

This thread started as a simple Headphone amp. It has grown through multiple input to cross feed, tone controls, virtual earthing, variable output resistor, and is now quite complex. This is a major project, perhaps even more complex than a straight power amplifier. It will be quite bulky, too, with its chokes, and certainly no portable toy!

I made an offer to the DIY crowd to do this for nix. The offer stands, but as of now, no further input can be accommodated. I cannot waste any more time on these decisions when I am trying to run a viable business elsewhere and this project is ballooning. Gareth, please stop the survey, we will proceed from the list of my post # 500 and I will adopt a Baxandall tone control with +/-10dB boost/cut at 50Hz and around 10KHz.

I would like to thank all who have contributed with their guidance and expertise, particularly Gareth and Nico. Watch this space.

Cheers,

Hugh
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Old 13th October 2009, 11:31 PM   #510
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Not so hard, look here at Bdent.com
Aha! Thanks Hugh, I'll order a few.

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