Simple Symetrical Amplifier

[a.wayne]

Originally Posted by Lazy Cat

Here it is, SSA suitable to drive yours low Z speakers.

I suggest you to built two monoblocks solid as a rock and please provide good and fast thermal dissipation.

The worst output BJT SOA case is at 25 V output voltage on 1 ohm impedance, resulting in 625 W power dissipation on 6 outputs (104 W per one BJT) which is managable with a good heatsinking.

Regards Andrej

Hello LC,

Can the outputs be substituted with MJW3281A/MJW1302A..


Regards,

[Lazy Cat]

Yes of course, as long as you matched them to hFEmin=100 evenly, so each BJT will flow exactly 1/6 of the output current. These all are based on Toshiba plastic power transistors, very popular ones, so be careful not to buy some sort of fakes.

[wahab]

Originally Posted by Lazy Cat

Here it is, SSA suitable to drive yours low Z speakers.

I suggest you to built two monoblocks solid as a rock and please provide good and fast thermal dissipation.

The worst output BJT SOA case is at 25 V output voltage on 1 ohm impedance, resulting in 625 W power dissipation on 6 outputs (104 W per one BJT) which is managable with a good heatsinking.

Regards Andrej

That s a lot of transistors according to this poster :

Originally Posted by Lazy Cat

Nooooo, too many transistors according to thread theme.

Besides this is not somewhat Joachim meant. Check my last sch, DRAIN output ...

[Lazy Cat]

Originally Posted by wahab

That s a lot of transistors according to this poster

... and keeps growing

[fredlock]

Originally Posted by Lazy Cat

Yes of course, as long as you matched them to hFEmin=100 evenly, so each BJT will flow exactly 1/6 of the output current. These all are based on Toshiba plastic power transistors, very popular ones, so be careful not to buy some sort of fakes.

Hi Lazy Cat,

Could you show us you jig or schematic in measuring hFE of the Power transistors?

[a.wayne]

Originally Posted by wahab

That s a lot of transistors according to this poster :

well it's a V12 .......... ...

[Esperado]

For Lazy Cat:
http://www.diyaudio.com/forums/digit...ml#post2731758

[Lazy Cat]

Originally Posted by Smiley 09

Lazy Cat,

Thank You for the SSA V-12.
A masterpiece of its own .
Please, can You add the dedicated Balanced Input stage to this particular design that will make this SSA-V12 best of IT. . ...

I just couldn't resist to this request.

[Lazy Cat]

Originally Posted by fredlock

Hi Lazy Cat,

Could you show us you jig or schematic in measuring hFE of the Power transistors?

Hi fredlock

You can use multimeter with hFE function which calculates hFE=Ic/Ib at Ic=1mA.

If you don't have such meter than you can use attached schematic.

[Smiley 09]

Dear Mr. Andrej

Thank You very much for the most beautiful SSA-V12 version.
You make me the beautiest day since long time awaiting for something to drive my speakers civilized - and You make it.
I know, this is the most Generous Scorpio's gift, You give to the whole worldwide sound-lovers & audio community. Thank You ...

Long Live & let God bless You . .

Andreas