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