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Old 29th March 2010, 06:54 PM   #1
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Default 100W Ultimate Fidelity Amplifier

I made this amplifier for test my home DIY speakers (two way TL).
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File Type: jpg APEX Kelvin BJT.jpg (427.2 KB, 42030 views)
File Type: jpg APEX KELVIN BJT Component Layout.jpg (141.8 KB, 35968 views)
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Old 29th March 2010, 07:15 PM   #2
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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.
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Old 29th March 2010, 07:32 PM   #3
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Amplifier is made to be better than most comercial home amps, and give me expect sound of my speakers in usual home audio sistem.
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Old 29th March 2010, 07:33 PM   #4
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Quote:
Originally Posted by event horizon View Post
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
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Old 29th March 2010, 08:42 PM   #5
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Amplifier was based on my apex kelvin amp. This is a reason becouse great sound dont suprise me.
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Old 29th March 2010, 09:10 PM   #6
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Blue PCB
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Old 29th March 2010, 10:54 PM   #7
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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.
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Old 29th March 2010, 11:04 PM   #8
wahab is offline wahab  Algeria
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There are obvious mistakes on the schematic..
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Old 29th March 2010, 11:11 PM   #9
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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?
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Old 29th March 2010, 11:19 PM   #10
wahab is offline wahab  Algeria
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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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