Burning Amplifier BA-2

[generg]

Originally Posted by Nelson Pass

Must be time for another BA front end board.

hm,hm... I´m waiting Mr. Pass! A new front end will be born?

I just bought the PCB for the last version and will try it next days. I have to hurry up!

But the nice with DIY is, its not so expensive to follow your paths.

[FastEddy]

Originally Posted by Nelson Pass

Must be time for another BA front end board.

generg: " A new front end will be born? ..."

Oh boy! A new front end? Assuming that be like a pre-amp board to feed the output stage(s)? ... Balanced or unbalanced inputs?

[generg]

SOS...........SOS,

on the new frontendboard of BA1 and BA2 the marked polarity of C205 and C206 is wrong, the caps get hot. You must change the polarity!!!!!!!!

Please could anybody confirm my experience?

SOS....SOS...

[cviller]

Thanks for pointing out this error. But it is not the caps, but the supplies that are marked wrong see attachment.

[FastEddy]

Got extra solder pads for + to +, - to - jumpers for those of use who might consider a single power supply?

[Tea-Bag]

no, they are two independent boards.
I sawed mine in half.

[generg]

.....some news, frontend works fine. I changed the feedbackresistor to 100kOhm, more gain for stripped F4. The outputstage is very similar to BA2 as far as I can see.

I was interested to compare the frontend as a pre with pumpkin. I did not forget to make the feedback from the output to D.
Sound is brighter, all singers seem to be younger, very good stage and more pointed.
Pumpkin darker, more dynamic, more colour, more crazy details.

Hi Zen Mod, how could I drive the BA1 outputstage with pumpkin? I am sooo cuuuurious to hear a single ended stage!

The points -D and +D from BA-1 are possible inputs for pumpkin without frying anything?

[Zen Mod]

Originally Posted by generg

.....

Hi Zen Mod, ......

Oh boy ..... ....... I must confess that I'm confused with all iterations ... I just mixed circuits and nomenclature .

give me a link to exact output stage you wanna fry with

[generg]

Hi speedy Zen Mod,

the link

Burning Amplifier BA-1

thanks Gonzales

[Zen Mod]

Originally Posted by generg

Hi speedy Zen Mod,

the link

Burning Amplifier BA-1

thanks Gonzales

what's missing , for your purpose , in BA1 output stage is - biasing network for both halves (upper and lower ) ;
they're incorporated in BA1 front end , so - besides unnecessary complication to bring BA1 output to operation "just" as test bed for mate with , I can't see any further benefit in using that , instead of F4 output stage .

in fact - maybe you need some more heat in your room , but I already told you most efficient heath & sound-vise solution - make another F4 and make full balanced setup .