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Old 12th March 2010, 05:32 PM   #211
cviller is online now cviller  Denmark
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Zen mod, thats not entirely true... the biasing has been moved out of the frontend circuit exactly for this purpose on the BA boards.
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Old 12th March 2010, 05:52 PM   #212
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Quote:
Originally Posted by cviller View Post
Zen mod, thats not entirely true... the biasing has been moved out of the frontend circuit exactly for this purpose on the BA boards.
sorry - I was looking just on schematics in Papa's article ;

as one of rare spoiled kids without interest in BA amps ....... I'm guilty ... as Sin itself ......

have you exact schematic - generated to coincide with board , so I can help generg to try what he want ?
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Old 12th March 2010, 05:57 PM   #213
cviller is online now cviller  Denmark
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The output is for BA-1 (the single ended).
Attached Images
File Type: png bias_schem.png (39.4 KB, 806 views)
File Type: png output_schem.png (45.1 KB, 803 views)
File Type: png frontend_schem.png (56.3 KB, 792 views)
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Old 12th March 2010, 06:09 PM   #214
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tnx cviller

@ generg

presuming that circuits from left and middle picture(s) in cviller's post are incorporated on same pcb - just shoot upper gates from positive output ; you must have output cap in place on pcb .

ground neg output ........ or shoot another BA1 output channel with it ..... and make bridged amp
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Old 12th March 2010, 06:34 PM   #215
generg is offline generg  Germany
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thanks civiller,thanks Zen mod!

I was very decided to walk in the dark alone without brother Zen Mods hand......

and now..... even two mates on my side, ha,ha

thanks again!
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Old 12th March 2010, 06:37 PM   #216
cviller is online now cviller  Denmark
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I'm just happy the endless discussions I had with Mark about how to split up the boards appears to pay of by allowing people to experiment.
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Old 12th March 2010, 09:34 PM   #217
generg is offline generg  Germany
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hm, cviller....

I just saw the schematic from Nelson Pass shows a local feedback for BA-2 and a global feedback for BA-1. R204 (47k) for BA_1 comes from Out of the output stage. R204 (47k) for BA-2 comes from the output of the gainboard.

In your version of the gainboard the feedback is always the way BA-2 is described. Even when I use BA-1 biasboard?

Nelson Pass writes in the BA-1 description "We will be operating this output stage au naturale, outside of any feedback loop,..."


Correct? Is the difference between the two ways important or is there a fault in the BA-1 schematic??
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Last edited by generg; 12th March 2010 at 09:42 PM.
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Old 12th March 2010, 09:49 PM   #218
generg is offline generg  Germany
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suppose I had an old version on my PC....

sorry!
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Old 12th March 2010, 09:51 PM   #219
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You just scared me there...
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Old 17th March 2010, 02:24 AM   #220
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Just want to ask a trivial question here regarding the power supply.
What are the reasons for and against for using a single bridge rectifier over two bridge rectifiers.
Sometimes Nelson uses two sometimes he uses one.
I was under the impression that using two was the preferred option.
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