100W Ultimate Fidelity Amplifier

[olafk]

The world needs AX11

Yes, the world needs AX11

 

[apexaudio]

Yes, the world needs AX11

Nice work, but be careful when soldering
Regards

 

[apexaudio]

BC639 and BC640 on same heatsink with BD139 and BD140 🙂

 

[apexaudio]

Zobel (4R7, 100nF) is removed to speaker terminal.

 

[44250]

Yes, the world needs AX11

Olaf,how are you pleased with APEX AX17 that you did allready?

(great job at AX11 too! 🙂 )

 

[PetruV]

Yes, the world needs AX11

thats a nice one i thought i would be the first to finish it

 

[olafk]

Olaf,how are you pleased with APEX AX17 that you did allready?

(great job at AX11 too! 🙂 )

Do you mean this one (AX20). It works fine. Only the Clip-LED is not tested because at the moment there was not the right equipment here to find the limits of the amplifier and not the right speaker to say more about the sound.
I only finished one channel. So mutch to do...

regards

 

[44250]

yes,that is the one. it looks great!

 

[apexaudio]

Do you mean this one (AX20). It works fine. Only the Clip-LED is not tested because at the moment there was not the right equipment here to find the limits of the amplifier and not the right speaker to say more about the sound.
I only finished one channel. So mutch to do...

regards

Nice work as usual, Regards

 

[olafk]

First impression AX11

regards

 

[davidus]

regards

Really nice work. And what about its sound?

 

[wiljj78]

Excellent Workmanship olafk.....

regards

hope it works perfect, Good luck.....

Regards,

 

[olafk]

This is the state of things as in the photo. I hope, I can test the amplifier on the weekend.

regards Olaf

 

[PetruV]

What is max voltage for ax11,can i use 50v? with 2sc5200

 

[Riff]

regards

little nice...

 

[olafk]

It works!!!

The amplifier operates from the very first moment. No offset, silent with open input. The sound (only basic car speakers for the test) is very clear and transparent and strong and fully in the basses. The amplifier is absolutly competitive with any commercial amplifiers of this class.
I like it! Thanks to apex!

regards Olaf


I was so curious to try it. Now I have trouble with my wife - friday night and not others then audio-amplifiers 🙂

 

[wiljj78]

CONGATULATION!!!

The amplifier operates from the very first moment. No offset, silent with open input. The sound (only basic car speakers for the test) is very clear and transparent and strong and fully in the basses. The amplifier is absolutly competitive with any commercial amplifiers of this class.
I like it! Thanks to apex!

regards Olaf


I was so curious to try it. Now I have trouble with my wife - friday night and not others then audio-amplifiers 🙂

....since the amp is working now it's time for family😉

Regards,
wiljj78

 

[PetruV]

What is max rail voltage for ax11 and 2sc5200 /1943

 

[wiljj78]

(Max rail voltage for AX11 is +/-40VDC) As stated in the drawing....

What is max rail voltage for ax11 and 2sc5200 /1943

even for 5200/1943 output Trans, due to VAS transistors and driver transistors (BD139&140) max rating voltage is 80V, entirely circuit was design to operate max voltage of +/-40VDC.

Hope it’s clear enough…

Regards,
wiljj78

 

[PetruV]

even for 5200/1943 output Trans, due to VAS transistors and driver transistors (BD139&140) max rating voltage is 80V, entirely circuit was design to operate max voltage of +/-40VDC.

Hope it’s clear enough…

Regards,
wiljj78

Maybe if i use different transistors,like mje340 /350 and some high voltage tall plastic ones for vas,i have some which i believe are over 300v, at 100ma for vas
2sc2229 that is 200v 50ma for vas