Burning Amplifier BA-3 - Page 4

17th August 2011, 04:41 PM
Nelson Pass The one and only Join Date: Mar 2001	Burning Amplifier BA-3 Introduction 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... Click here to read the entire article Last edited by Jason; 14th September 2011 at 09:22 AM.

21st November 2012

Pocoyo

diyAudio Member

why papa always use panasonic 3w ? is there something secial with this resistor ?

14th April 2013

n3szd

diyAudio Member

I would love to attend.. Kinda a dream come true

16th July 2013

hendriono

diyAudio Member

Very nice design... Thanks Nelson Pass...

2nd June 2014

pcbchina

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

The one and only

That sounds a little phallic...

But I'll do something soon.

13th October 2016

Manolo47

diyAudio Member

Wow 10 uf, that's high, can one get away with a lower capacitance output cap? Thanks!

13th October 2016

woody

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. https://www.waltjung.org/PDFs/Picking_Capacitors_1.pdf

14th October 2016

Manolo47

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

woody

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

woody

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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