Simple Symetrical Amplifier

[a.wayne]

Andrew nothing silly , play music with alot of dynamics and you will blow an 10 amp output fuse the load is 1 ohm, academic and not unusual IMO...


You should get out more .......😛......😀

 

[SOUND_Rays]

a.wayne,

What speakers do You need to drive with so low 1 ohm impedance? 😕

 

[AndrewT]

If you blow a 10A output fuse you have done something really silly.

Andrew nothing silly , play music with alot of dynamics and you will blow an 10 amp output fuse the load is 1 ohm, academic and not unusual IMO...

trying to play music into 1ohm speakers seems worse than really silly !

 

[Lazy Cat]

SSA Low Impedance HP

Thanks LC,

awaiting the values necessary to hear an SSA at power .....🙂

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

 

[Bigun]

Wow, look at them output transistors, 6 per side !

I name this circuit the "E-Type" - with the V12 😀

 

[psychosteve72]

hey Lazy Cat, thanks for the help, its a personal foible of mine but id rather bend the legs out a bit rather than rearrange the board and swash all the tracks close together. i work it as about 2mm on each trans to get the faces touching.

as long as the face touch i don't see it as a problem, and i find the extra space around the tracks helps with me etching and drilling my own boards.

thanks again, steve.

 

[a.wayne]

🙂

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

Thank you LC........... no i can go off and play .......🙂...

 

[a.wayne]

trying to play music into 1ohm speakers seems worse than really silly !

Your Ignorance is unbecoming Andrew , Grow up .....

"The test of the machine is the satisfaction it gives you. 🙂There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed."

Robert M Pirsig.

Wow, look at them output transistors, 6 per side !

I name this circuit the "E-Type" - with the V12 😀

LOL...😀 I like it SSA-V12 .........................🙂

 

[Smiley 09]

Balanced I/P SSA -V12

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. . ...

 

[MiiB]

smiley... Lc already made a balanced front-end.. just combine the two....and you have what your'e looking for...no need for spoon feeding there...

 

[a.wayne]

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]

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 :

Nooooo, too many transistors according to thread theme. 😱

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

😀

 

[Lazy Cat]

That s a lot of transistors according to this poster 😀

... and keeps growing 😀 😀 😀

 

[fredlock]

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]

That s a lot of transistors according to this poster :


😀

well it's a V12 .......... 🙂...

 

[Esperado]

My protection circuit principle

For Lazy Cat:
http://www.diyaudio.com/forums/digi...sures-class-d-system-project.html#post2731758

 

[Lazy Cat]

SSA Balanced Low Impedance HP

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]

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]

The Beautiest V-12 Masterpiece

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