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Old 7th July 2013, 03:14 PM   #21
PMI is offline PMI  United States
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Originally Posted by lanchile View Post
I think it is time to start building some PCB's for this amp. it looks like is a good candidate and deserve to be build.
Aren't these already for sale?
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Old 7th July 2013, 03:25 PM   #22
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Yes, but from his site!http://www.ska-audio.com/Forum/YaBB.pl?custompage=order Someone here can build or modified this pcb. since He released the schematic to the public, I do not think He would mind.
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Old 7th July 2013, 04:23 PM   #23
PMI is offline PMI  United States
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Originally Posted by lanchile View Post
Yes, but from his site!SKA sponsored Audio Forum - Order Someone here can build or modified this pcb. since He released the schematic to the public, I do not think He would mind.
Well, I think I would want his permission first. Even then, the interest might be very limited, because you can buy from the original designer.

I am making a few boards for Bonsai's nx-Amp, because he is a) not selling them himself, and b) he published all the information to encourage people to do that.

nx-amp build thread

Even there, and w. encouragement by Bonsai, only 4-5 people seem to be seriously interested.

I would hate to use information that was published for discussion and experimenting, and use it to clone his product. Just b/c someone published a schematic, does not mean it is automatically in the public domain to make copies of his design...
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Old 7th July 2013, 04:37 PM   #24
tinitus is offline tinitus  Europe
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Originally Posted by PMI View Post
Just b/c someone published a schematic, does not mean it is automatically in the public domain to make copies of his design...
it was clearly published by the man himself, with the words... freely available to all
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Old 7th July 2013, 04:40 PM   #25
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Originally Posted by tinitus View Post
it was clearly published by the man himself, with the words... freely available to all
Thanks, I guess I was too busy admiring the schematic to read all the words...
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Old 7th July 2013, 07:34 PM   #26
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Read the SKA website. Read the thread Rebuild by mikeg. mikeg has transformed the amp by rebuild and mod. The GB150 has been upgraded and better. Just ask Greg.
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Old 8th July 2013, 10:07 AM   #27
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Originally Posted by Greg Erskine View Post
hi kacernator,

Please see the attachment.

regards


Note: I have double-checked the schematic but there is always a chance I missed something. Please let me know of any errors.
Some of the more recent posts on the SKA forum describe 0R15 source resistors on the output devices for improving bias stability. I am not sure if these are per device or shared
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Old 8th July 2013, 10:31 AM   #28
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Originally Posted by davidsrsb View Post
Some of the more recent posts on the SKA forum describe 0R15 source resistors on the output devices for improving bias stability. I am not sure if these are per device or shared
Thanks davidsrsb,

These are on the schematic, R28 and R29, but I have shown the rail terminals on the wrong side of them, hence the confusion.

I will fix the schematic tomorrow and repost.

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Old 8th July 2013, 06:22 PM   #29
egra is offline egra  Hungary
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Please share the shema with zener mod at input, if possible. Thanks
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Old 8th July 2013, 08:23 PM   #30
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Originally Posted by egra View Post
Please share the shema with zener mod at input, if possible. Thanks
The Zener mod was replaced by the RCR mod.
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