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Burning Amplifier BA-3
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Old 21st November 2012, 08:32 PM   #31
Pocoyo is offline Pocoyo  Indonesia
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why papa always use panasonic 3w ? is there something secial with this resistor ?
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Old 14th April 2013, 03:02 PM   #32
n3szd is offline n3szd  United States
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I would love to attend.. Kinda a dream come true
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Old 16th July 2013, 09:45 PM   #33
hendriono is offline hendriono  Indonesia
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Very nice design... Thanks Nelson Pass...
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Old 2nd June 2014, 08:18 AM   #34
pcbchina is offline pcbchina  India
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Really love to see nelson flexing his mighty pen in action in this forum,
makes mortal like me think. The maestro sway his magic wand once more.
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Old 27th June 2014, 04:36 AM   #35
Nelson Pass is offline Nelson Pass  United States
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Burning Amplifier BA-3
That sounds a little phallic...

But I'll do something soon.

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Old 13th October 2016, 11:07 AM   #36
Manolo47 is offline Manolo47  Puerto Rico
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Default BA-3 line stage output cap...

Wow 10 uf, that's high, can one get away with a lower capacitance output cap? Thanks!
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Old 13th October 2016, 11:05 PM   #37
woody is offline woody
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Burning Amplifier BA-3
You could " get away with " a smaller value but I
gather the rule of thumb is to use a much larger
cap than is really needed. Here is an old but still
excellent article about audio caps. http://www.waltjung.org/PDFs/Picking_Capacitors_1.pdf
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Old 14th October 2016, 10:50 AM   #38
Manolo47 is offline Manolo47  Puerto Rico
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This cap ought to be low pas filter. Why not put a 50k -100k resistor to ground after it, with that a 1 to 2 uf cap would work. And even without that lets say the amp. has an input impedance of 50k, that would also work. Unless the cap does something more.
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Old 14th October 2016, 11:18 AM   #39
woody is offline woody
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Because the output bank already has an input impedance of about 47k ohms in the SE version and the push pull version will have an input impenitence of closer to 2k.
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Old 14th October 2016, 11:36 AM   #40
woody is offline woody
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Sorry the input impenitence of that PP output stage may not be as low as I first thought but it will be at least 7.5k or lower.
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