100W Ultimate Fidelity Amplifier

apexaudio · 09:57 AM

I made this amplifier for test my home DIY speakers (two way TL).

D4 on component layout wrong polarity, in post #253 is corect componenet layout.

event horizon · 29th March 2010, 08:15 PM

Hi Mile, at least i think that's right

Much as i love your thread on the class H amplifier (& i won't forget how you have possibly helped me create something of improved efficiency

) you need to bias that thing into class A & then you'll get even more fidelity.

You'll need to parallel output transistors & use huge heatsinks but i feel sure that class A biasing will show you the "ultimate fidelity". Admittedly a well biased class B is good, going OTT is the final hurdle & a rather fascinating transformation...

Bests to you chap & thanks for your posts on lots of interesting stuff, i for one seriously appreciate it

Oh, i'm sure something will come of your input one day in the not too distant future

Bests, Mark.

apexaudio · 29th March 2010, 08:32 PM

Amplifier is made to be better than most comercial home amps, and give me expect sound of my speakers in usual home audio sistem.

apexaudio · 29th March 2010, 08:33 PM

Quote:

Originally Posted by event horizon

Hi Mile, at least i think that's right

Much as i love your thread on the class H amplifier (& i won't forget how you have possibly helped me create something of improved efficiency

) you need to bias that thing into class A & then you'll get even more fidelity.

You'll need to parallel output transistors & use huge heatsinks but i feel sure that class A biasing will show you the "ultimate fidelity". Admittedly a well biased class B is good, going OTT is the final hurdle & a rather fascinating transformation...

Bests to you chap & thanks for your posts on lots of interesting stuff, i for one seriously appreciate it

Oh, i'm sure something will come of your input one day in the not too distant future

Bests, Mark.

Thanks Mark

apexaudio · 29th March 2010, 09:42 PM

Amplifier was based on my apex kelvin amp. This is a reason becouse great sound dont suprise me.

apexaudio · 29th March 2010, 10:10 PM

Blue PCB

butch_vlad · 29th March 2010, 11:54 PM

Can we have the PCB layout to etch our own boards? I'm looking for new amplifier to try.
Apex do you have something similar with this one but with 2 pairs of output transistors? That is what I'm looking for but is hard to find. Was looking at Bora's Techno amplifier but I don't have enough info to make my own...yet...who knows.

wahab · 30th March 2010, 12:04 AM

There are obvious mistakes on the schematic..

butch_vlad · 30th March 2010, 12:11 AM

Yeah he likes to post schematics with mistakes :P
He will post the correct schematics after a while, I hope.
Can u name some mistakes?

wahab · 30th March 2010, 12:19 AM

R8 and R2 values are reversed..
R8 must be 560R and R2 22K...

C7 value ,is plain wrong , and should be much lower,
something between 3.3 and 18pF..

As i pointed it with many of his designs, R5 and C3
must be removed as they create a hard rail sticking when
the amp is overloaded.
There s better means to achive stability.....

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29th March 2010, 08:15 PM	#2
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	Hi Mile, at least i think that's right Much as i love your thread on the class H amplifier (& i won't forget how you have possibly helped me create something of improved efficiency ) you need to bias that thing into class A & then you'll get even more fidelity. You'll need to parallel output transistors & use huge heatsinks but i feel sure that class A biasing will show you the "ultimate fidelity". Admittedly a well biased class B is good, going OTT is the final hurdle & a rather fascinating transformation... Bests to you chap & thanks for your posts on lots of interesting stuff, i for one seriously appreciate it Oh, i'm sure something will come of your input one day in the not too distant future Bests, Mark. __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

29th March 2010, 08:32 PM	#3
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	Amplifier is made to be better than most comercial home amps, and give me expect sound of my speakers in usual home audio sistem.

29th March 2010, 11:54 PM	#7
butch_vlad diyAudio Member Join Date: Feb 2008	Can we have the PCB layout to etch our own boards? I'm looking for new amplifier to try. Apex do you have something similar with this one but with 2 pairs of output transistors? That is what I'm looking for but is hard to find. Was looking at Bora's Techno amplifier but I don't have enough info to make my own...yet...who knows.

30th March 2010, 12:04 AM	#8
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	There are obvious mistakes on the schematic..

30th March 2010, 12:11 AM	#9
butch_vlad diyAudio Member Join Date: Feb 2008	Yeah he likes to post schematics with mistakes :P He will post the correct schematics after a while, I hope. Can u name some mistakes?

30th March 2010, 12:19 AM	#10
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	R8 and R2 values are reversed.. R8 must be 560R and R2 22K... C7 value ,is plain wrong , and should be much lower, something between 3.3 and 18pF.. As i pointed it with many of his designs, R5 and C3 must be removed as they create a hard rail sticking when the amp is overloaded. There s better means to achive stability.....