SX-Amp and NX-Amp

[fab]

Hi Bonsaï
Just some thoughts....
I think that the actual unpopulated NX pcb from Jim's audio may suit the SX design if we add a couple of jumpers (to bypass the pre-drivers) and connect part of the VBE multiplier to one output source emitter....
Or maybe we can use populated NX amp, reduce power supply voltage and increase bias current...

Fab

 

[Bonsai]

Yes, the nx-Amp board can be used but it will need some jumpers and track cut and soldered.

Better to use the single sided sx-Amp proposed here.

 

[Bonsai]

Thinking backwards, the sx amp will also form the basis of a fine 50 W class AB. Drop one output pair, raise supply to +- 35V and change the bias generator to class AB style.

 

[pinnocchio]

Not yet finished with the burn in but the Nx amplifier sounds REALLY good so far!!

Nice work Bonsai!

Do

 

[Junie]

Do, pics please

 

[pinnocchio]

Do, pics please

It's actually just on a test heatsink, not yet in a chassis so it looks quite ugly for the moment. As soon as it is decent, I will post pictures.

Ciao!
Do

 

[still4given]

This is the DIY audio forum. We like seeing them without their clothes on.

 

[pinnocchio]

This is the DIY audio forum. We like seeing them without their clothes on.

Don't ever say I didn't warn you...

Be affraid, be very affraid!!!!!

I now have the second power supply ready and everything will sit in a nice chassis when all tests have been done.

Ciao!
Do

 

[still4given]

Beautiful!!!! That's the way I like to see them. You usually can't see much once it's in the case. Thanks for the great picture!

 

[thimios]

First step

Start point.

 

[wahyu hening yukie]

its wonderfull diy boards.

 

[pinnocchio]

Start point.

Nice PCB! What process did you use?

Thanks
Do

 

[pinnocchio]

Beautiful!!!! That's the way I like to see them. You usually can't see much once it's in the case. Thanks for the great picture!

Thx!

 

[thimios]

Nice PCB! What process did you use?

Thanks
Do

The photographic method of course.
I can explain this more if anyone interesting about this.

 

[still4given]

The photographic method of course.
I can explain this more if anyone interesting about this.

Who do you buy your boards from? Do you have a link?

 

[alex mm]

..... sorry ,I forget to mark silk screen on bottom (yellow ) C1=10uF/50V Please solder this SMD capacitor bottom side. Question ,will be problem if rail voltage it's +/-24V ?
Regards,Alex

 

[thimios]

Who do you buy your boards from? Do you have a link?

Yes of cource ,here.einseitig beschichtet bei reichelt elektronik
And sometimes from local supplier

 

[thimios]

slow progress

this afternoon work

 

[Bonsai]

Very nice thimios!!!

 

[thimios]

Very nice thimios!!!

Thanks dear ,can you explain this more?Thinking backwards, the sx amp will also form the basis of a fine 50 W class AB. Drop one output pair, raise supply to +- 35V and change the bias generator to class AB style.
I'm afraid i haven't big heatsinks for class A.