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Old 17th August 2011, 05:41 PM  
Nelson Pass is offline Nelson Pass  United States
The one and only
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Join Date: Mar 2001
Default Burning Amplifier BA-3


In the BA-1 and BA-2 projects we constructed two different amplifiers using very similar input and voltage gain stages (aka the “front ends”), but used them to drive two different Class A Mosfet follower output stages. Now we are going to flip this approach and begin...

Last edited by Jason; 14th September 2011 at 10:22 AM.
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21st November 2012
Pocoyo's Avatar
diyAudio Member
why papa always use panasonic 3w ? is there something secial with this resistor ?
14th April 2013
n3szd's Avatar
diyAudio Member
I would love to attend.. Kinda a dream come true
16th July 2013
diyAudio Member
Very nice design... Thanks Nelson Pass...
2nd June 2014
diyAudio Member
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.
27th June 2014
Nelson Pass's Avatar
Nelson Pass
The one and only
That sounds a little phallic...

But I'll do something soon.

13th October 2016
diyAudio Member
Wow 10 uf, that's high, can one get away with a lower capacitance output cap? Thanks!
14th October 2016
diyAudio Member
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
14th October 2016
diyAudio Member
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.
14th October 2016
diyAudio Member
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.
14th October 2016
diyAudio Member
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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