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Old 2nd November 2011, 07:39 PM   #371
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Quote:
Originally Posted by buzzforb View Post
To whom is the question directed? It depends on how things are setup.
if making my own balanced frontend boards, I thought it might be convenient to place bias curcuit on frontend board
would make it easy to hardwire output stage
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Old 2nd November 2011, 07:48 PM   #372
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If making your own, anything is possible.
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Old 2nd November 2011, 07:49 PM   #373
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Old 3rd November 2011, 01:12 AM   #374
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nope
I'm sure it 'belongs' where it is, with the outputs
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Old 3rd November 2011, 01:27 AM   #375
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It would seem that it still depends on your setup. There are no set rules are there? How many connections from bias board to output board on the DIyAudio store version? What criteria have you failed in your layout?
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Old 3rd November 2011, 01:36 AM   #376
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Quote:
Originally Posted by buzzforb View Post

There are no set rules are there?
oh yes, there are

when you begin to draw things, it gets into your head

think of the B2 bias curcuit/board doing the job of the jfets in F5
its the same over again
do not seperate bias curcuit from the outputs
not the first time I would have been told not to
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Old 3rd November 2011, 10:26 AM   #377
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If your talking about putting the bias circuit in a seperate enclosure with FE using seperated PSU then i can see it being a bad idea, but as it stands now, the bias circuit is seperated from tthe output board and need only be placed in same enclosure with same PSU. So, if you wanted to put a custom BA-3 FE with bias onboard in same enclosure with hradwired output stage, i don't see how this would be any different thatn the setup from the DIYAudio store. Perhaps you could explain why it would be.

Last edited by buzzforb; 3rd November 2011 at 10:28 AM.
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Old 3rd November 2011, 11:36 AM   #378
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absolutely correct

bias curcuit could be placed on frontend board
but according to conclusion, it should still be powered from same supply as output stage

frontend itself could still have its own seperate supply, but not the bias curcuit
whether it makes sense or not
but I'm in doubt about it
right now I might just use additional bank of small supply caps fore the frontend
much simpler

no doubt, Nelson's 'new modular system' means that even the seperate bias board could more easily be replaced by other bias module

its no doubt safer to use the modules on hand in store
and value of amp will no doubt also be higher, and neater
but personally I learn more from trying to change things
that is if it doesn't burst into flames
I hope thats not what burning amps means
but nothing decided yet
other than I have to build it
but balanced is not cheap
need to calculate any possible risks

but hey, its about having fun too
and I could use another heater during the winter
a highend heater playing nice music

those are the thoughts directly from my confused brain
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Old 3rd November 2011, 03:16 PM   #379
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I would do what I have suggested and will be doing personally. Put output board and bias boards in main case with Psi and have FE separate in module with connection to both amp and psi.
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Old 3rd November 2011, 03:35 PM   #380
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The bias i think should come up slowly with the output voltage. So it must be connected to those V+ and V-. I would not like to see a big THUMP from fragile speakers. ..
The FE can be powered up & shut down independently of the output stage.
I made various variants of the output stage and FE (what i called the driver then), just connected with two wires.
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