100W Ultimate Fidelity Amplifier

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prasi

prasi

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Joined 2014
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There is an index of apex amplifiers thread created by xrk971. Very useful in finding the final design.

My findings/ guesses on nomenclature
AX for class AB with bjt,
AA for class A with bjt
FX for MOSFET o/p class AB
SR for studio reference with bjt class AB
FR for studio reference with MOSFET class AB

The number generally denotes the no of transistors or it can denote the power o/p.

Well, that's as far as I can guess..
Reg
Prasi
 
D

delange

Member
Joined 2012
prasi said:
There is an index of apex amplifiers thread created by xrk971. Very useful in finding the final design.

My findings/ guesses on nomenclature
AX for class AB with bjt,
AA for class A with bjt
FX for MOSFET o/p class AB
SR for studio reference with bjt class AB
FR for studio reference with MOSFET class AB

The number generally denotes the no of transistors or it can denote the power o/p.

Well, that's as far as I can guess..
Reg
Prasi
Click to expand...

Thank you for the clarification Prasi
 
B

benz2

Member
Joined 2016
prasi said:
There is an index of apex amplifiers thread created by xrk971. Very useful in finding the final design.

My findings/ guesses on nomenclature
AX for class AB with bjt,
AA for class A with bjt
FX for MOSFET o/p class AB
SR for studio reference with bjt class AB
FR for studio reference with MOSFET class AB

The number generally denotes the no of transistors or it can denote the power o/p.

Well, that's as far as I can guess..
Reg
Prasi
Click to expand...


Thanks! I have used this info to organize my folders of images a bit. However this leaves out a few series: A, BA, BG, BX, CA, F, FA, FH, GA, H, HX, MM, NX, P

...any guidance on these?
 
prasi

prasi

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Joined 2014
sites.google.com/site/analogdesign1234/
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prasi said:
Apex AA14 just a quick draft as I had a moment today. not yet optimized, for comments. its late here, almost 1.00AM

reg
Prasi
Click to expand...

Here is a much more refined layout for AA14... 'Ultimate Fidelity' in Class-A?:D

reg
Prasi
 

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  • AA14 lay-r4-bot.png
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  • AA14 sch-r4.png
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D

donovas

Member
Joined 2014
hi mr miles, sorry for jumping the thread but i wasnt getting the help i desperately need in the other thread which i guess you're not frequenting so here i am. :)

i built your psu-5 according to the post, and it works, sounds wonderful but the voltage drop is 8v from input to output.

how can i lower the voltage loss to make it more economical?

i changed the 12v zener to an led and it only lowered the voltage loss 1v or so.

thanks.

http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-2.html#post2305431
 
D

delange

Member
Joined 2012
donovas said:
hi mr miles, sorry for jumping the thread but i wasnt getting the help i desperately need in the other thread which i guess you're not frequenting so here i am. :)

i built your psu-5 according to the post, and it works, sounds wonderful but the voltage drop is 8v from input to output.

how can i lower the voltage loss to make it more economical?

i changed the 12v zener to an led and it only lowered the voltage loss 1v or so.

thanks.

http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-2.html#post2305431
Click to expand...

See post #18 of the Studio Reference amplifier.
 
prasi

prasi

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Joined 2014
sites.google.com/site/analogdesign1234/
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prasi said:
AA9 MD layout..
Click to expand...

too late to edit, but here is the consideration.
I could have avoided the jumper for feedback but i want to take it right from the output connector...
Also it is possible to increase the distance between bdw's, but pcb would become too large...
also i kept the width of pcb as small as possible so that a 2U (ideal 3U and above) cabinet could be used to build the amp with adequate heat sinking..Pl confirm Mr. Mile..
reg
Prasi
 
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prasi

prasi

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xrk971 said:
Beautiful work there Prasi. :)
:cheers:

May we please have PDFs for home etching?
Thanks!
Click to expand...

Thanks X. here are all the files and gerbers for APEX AA14 Class A Amp.

reg
Prasi
 

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  • aa14 r5-top silk.pdf
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  • aa14 r5-bot cu.pdf
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  • AA14 sch-r5.png
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  • AA14 lay-r5.png
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prasi

prasi

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Joined 2014
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prasi said:
too late to edit, but here is the consideration.
I could have avoided the jumper for feedback but i want to take it right from the output connector...
Also it is possible to increase the distance between bdw's, but pcb would become too large...
also i kept the width of pcb as small as possible so that a 2U (ideal 3U and above) cabinet could be used to build the amp with adequate heat sinking..Pl confirm Mr. Mile..
reg
Prasi
Click to expand...

Here are the pdf files for AA9MD and gerbers.
reg
Prasi
 

Attachments

  • AA9MD lay.png
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  • AA9MD sch.png
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  • apex aa9 MD rev2-bot cu.pdf
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  • apex aa9 MD rev2-top silk.pdf
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  • apex aa9 MD rev2 gerbers.zip
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G

gaborbela

Member
Joined 2005
Very nice layout, interesting schematic thank you!

My question do the power darlingtons need to matched (usually when we use multiple power semis need some matching)
If yes how we can do that?
If I do not find BDW darlingtons can I (we) use the more available TIP142 & 147 here in N. America

Thank you
 
T

tommeeto

Member
Joined 2016
Apex TB1

I know I messed up a little with pcb, but Mr. Apex's TB1 works perfectly. Frequency from 5Hz up to 17kHz with absolutely no distortion, perfect sine. I don't have a proper signal generator, so I use my phone as it. All wirings are temporary. I'll post again when I connect it properly.

Thanks Apex for Your great contribution in DIY.
 

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prasi

prasi

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Joined 2014
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Paid Member
gaborbela said:
Very nice layout, interesting schematic thank you!

My question do the power darlingtons need to matched (usually when we use multiple power semis need some matching)
If yes how we can do that?
If I do not find BDW darlingtons can I (we) use the more available TIP142 & 147 here in N. America

Thank you
Click to expand...
Hi Gabor,
AA9MD has the same sch as AA9 posted few posts ago except for o/p stage. And AA9 has TIP142,147 as o/p .
You could take a look at that.
Also BDW are available in mouser.

Although Mr. Mile can answer, but I think his ckts rarely call for matched transistors especially o/p.
The large emitter resistors would also help in this regard.
An eBay transistor testing ckt might work, although to be honest I have not tested a Darlington transistor on it.
Reg
Prasi
 
Last edited:
apexaudio

apexaudio

Member
Joined 2010
tommeeto said:
I know I messed up a little with pcb, but Mr. Apex's TB1 works perfectly. Frequency from 5Hz up to 17kHz with absolutely no distortion, perfect sine. I don't have a proper signal generator, so I use my phone as it. All wirings are temporary. I'll post again when I connect it properly.

Thanks Apex for Your great contribution in DIY.
Click to expand...

Nice work, did you use loudness switch?
Regards
 
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