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Old 7th September 2009, 03:58 AM   #41
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the area for C203 large enough for the Elna Silk cap N.P. mentioned?
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Old 7th September 2009, 04:05 AM   #42
cviller is offline cviller  Denmark
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the area for C203 large enough for the Elna Silk cap N.P. mentioned?
Yeah, they are large enough - those mentioned by papa is actually normal radial electrolytics. I'll add a special footprint for those before fabrication.
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Old 9th September 2009, 06:12 PM   #43
joho is offline joho  Netherlands
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Default BA-2 versus Aleph series

Dear Mr.Pass,

Can you tell us something about the BA-2 sound compared with an Aleph (5) series poweramp?
What are the procs and cons?


Thx in advance,
Johan.
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Old 9th September 2009, 06:29 PM   #44
cviller is offline cviller  Denmark
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Well I'm not pass and I haven't heard the beast yet, but from the schematics I would think that it is safe to say that it sounds more like a pushpull amp.
You will have less 2nd harmonic distortion and more 3rd. So it will probably sound more analytic and have a better control over the bass.
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Old 11th September 2009, 02:20 AM   #45
tms0425 is offline tms0425  United States
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Hmm.. I have to think about that. The reason for the distance (~5mm) I have chosen is that it fits with many standard terminals. If you can point me to some reasonably priced easy to get terminals of a different spacing than 5mm, I might change it.

BTW: The board is 2.7x5.4 in inches.
Here is what I'm using on your power supply boards. They get a little bit tight as you can see...
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Old 11th September 2009, 04:07 PM   #46
cviller is offline cviller  Denmark
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Originally Posted by tms0425 View Post
Here is what I'm using on your power supply boards. They get a little bit tight as you can see...
I think it might be possible to just add some more holes, so you can connect like you are proposing.

I have added some extra holes for the two 2sj74 option instead of the illusive 2sj109...

Another two things thing that need to be sorted out are 1) the trimpots - they should be accessible when vertically mounted (they kinda already are since they are so close to the edge) and 2) Q203 needs a little heatsinking, which there must be room for.
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Old 11th September 2009, 04:50 PM   #47
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I find that I can put 2SJ74's right in the 2SJ109
hole pattern. Am I in error?

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Old 11th September 2009, 05:31 PM   #48
cviller is offline cviller  Denmark
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Quote:
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I find that I can put 2SJ74's right in the 2SJ109
hole pattern. Am I in error?

In the darker corners of this forum, there is a strong passion for being able to mount the flat parts of to-92 casings together...
It should give slightly better heat transfer between the dies - I would guess the timeconstant to be fairly large though.
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Old 11th September 2009, 05:47 PM   #49
tms0425 is offline tms0425  United States
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In the darker corners of this forum, there is a strong passion for being able to mount the flat parts of to-92 casings together...
It should give slightly better heat transfer between the dies - I would guess the timeconstant to be fairly large though.
You can also use the sweet little dual inline to-92 heatsinks from the group buy but you need to lay them end to end. That way either single j109 or j74 pair fits nicely. Peter did this on the Aleph J boards.
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Old 11th September 2009, 05:54 PM   #50
AR2 is offline AR2  United States
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Originally Posted by tms0425 View Post
You can also use the sweet little dual inline to-92 heatsinks from the group buy but you need to lay them end to end. That way either single j109 or j74 pair fits nicely. Peter did this on the Aleph J boards.
Yes, that is quite fine, but where to get now those heatsinks?
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