Ian Hegglun's ClassA^3 Cube-Law Amp - diyAudio
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Old 3rd September 2014, 12:59 PM   #1
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Default Ian Hegglun's ClassA^3 Cube-Law Amp

With the publication of Linear Audio, Volume 8, I would like to initiate a builder's thread and discussion in regard to Ian Hegglun's new cube-law design.

One PCB, enough for a single channel, is included with Volume 8. Extra PCBs, links to simulation files, supplementary documents, parts lists, and BOM may be found on my website: Greenchild

I plan on documenting my own build within the next several weeks.
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Old 13th September 2014, 08:31 AM   #2
UrSv is offline UrSv  Sweden
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I'll donate my single PCB I got to anybody who's building. I have too many projects as it is

PM me..
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Old 15th September 2014, 01:05 AM   #3
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I look forward to following your build.
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Old 17th September 2014, 12:58 PM   #4
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I'm ahead of you guys

I must, to my chagrin, call your attention to an incorrect footprint on the silk screen.
No show stopper, but be aware.
Details here. My bad.

Jan
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Old 17th September 2014, 01:00 PM   #5
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Originally Posted by jan.didden View Post
I'm ahead of you guys
Very nice, Jan! I will be close behind you!
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Old 17th September 2014, 05:00 PM   #6
Joschl is offline Joschl  Germany
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I'd like to follow UrSv and donate my board to an interested builder.
PM me...
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Old 26th September 2014, 04:30 PM   #7
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Originally Posted by jan.didden View Post
I'm ahead of you guys Jan
Jan, is that R49 next to Q8? The "9" is covered by the footpad? I notice you have a 1.2M resistor in there, although the BOM specifies 1M for R49.

In any regard, I'm stuffing 1M in there.... Hopefully my assumption is correct.
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Old 26th September 2014, 04:36 PM   #8
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Originally Posted by greenm01 View Post
Jan, is that R49 next to Q8? The "9" is covered by the footpad? I notice you have a 1.2M resistor in there, although the BOM specifies 1M for R49.

In any regard, I'm stuffing 1M in there.... Hopefully my assumption is correct.
Yes correct on both counts. I had the same question on R49 to Ian, and both will work since there is anyway the series trimmer to adjust.

Jan
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Old 26th September 2014, 11:45 PM   #9
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Yes correct on both counts
Thanks, Jan.

I also noticed that there are only two holes for D3, although the Bi-Color LED has three legs.... How does that work?
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Old 27th September 2014, 02:02 AM   #10
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Default Progress

Made some progress today!
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