100W Ultimate Fidelity Amplifier

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#8,741
e_fortier said:
Hi,

I've never built an Apex power amp so looking through this thread the A9 and AX11 seem to be popular so I decided to send (very soon) the Gerbers to the PCB manuf. so I can have my own.
These PCB layouts were donated freely. (see attached Layout from Sonal Kunal and Thiagomogi, thanks guys)

I just realized that my power transformer are about +/-39Vac, 300Va, I've got 4 of them and I'd like to use them of course. This 78Vct translate to about +/-53Vdc so too high for the normal A9 and AX11. Can I use these nice PCB layout and change a few components to make them work at +/-53Vdc ?

If so, what should be changed ??

If not, my solution would be to make a bipolar buffered zener regulator a la Zen Part 3 from NP.

Thanks a lot,
Eric
Click to expand...

You can use regulated PSU from thread http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-2.html
Regards
 
#8,744
P30ZF

Zero Negative Feedback Preamplifier
 

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  • APEX ZF Preamp.JPG
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#8,749
e_fortier said:
Hi,

I've never built an Apex power amp so looking through this thread the A9 and AX11 seem to be popular so I decided to send (very soon) the Gerbers to the PCB manuf. so I can have my own.
These PCB layouts were donated freely. (see attached Layout from Sonal Kunal and Thiagomogi, thanks guys)

I just realized that my power transformer are about +/-39Vac, 300Va, I've got 4 of them and I'd like to use them of course. This 78Vct translate to about +/-53Vdc so too high for the normal A9 and AX11. Can I use these nice PCB layout and change a few components to make them work at +/-53Vdc ?

If so, what should be changed ??

If not, my solution would be to make a bipolar buffered zener regulator a la Zen Part 3 from NP.

Thanks a lot,
Eric
Click to expand...

I made simulation of AX11 topology using +-90VDC. It tested my my friend, he claimed it have good sound quality. If you interested, I can make AX11 simulation using +/-53VDC.
 
#8,750
I had never made a layout for the "100W ultimate fidelity Amplifier-AX-14", there are many many interesting designs by various guys + Mr. Mile's compact layout.
Anyway here it is, similar to the FR-100 layout I did and is based on the attached schematic early on in this thread. Its compatible to adding more pairs easily by minor modifications, only in o/p stage of the layout.
regards
Prasi
 

Attachments

  • APEX Kelvin V2.jpg
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  • AX-14 lay.png
    AX-14 lay.png
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#8,753
prasi said:
I had never made a layout for the "100W ultimate fidelity Amplifier-AX-14", there are many many interesting designs by various guys + Mr. Mile's compact layout.
Anyway here it is, similar to the FR-100 layout I did and is based on the attached schematic early on in this thread. Its compatible to adding more pairs easily by minor modifications, only in o/p stage of the layout.
regards
Prasi
Click to expand...

slightly revised with film i/p cap (15mm pitch like epcos 10u/63V)
 

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#8,756
e_fortier said:
Hi Bimo,

That would be very nice of you 😀

Will I be able to use the attached Layout ? (I already have the Gerber)

Thank you,
Eric
Click to expand...

You have must be make the layout yourself. Because, it is slightly different than AX11 which originally using 35VDC. It is more like my modification of AX11 that built by someone here. For using +-53VDC, I will make the modification as simple as possible, but still have good specification.
 

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#8,760
alex mm said:
P30ZF preamplifier PCB layout ,not tested ..... 🙂
Regards,Alex
Click to expand...

Hey Alex,

Very cool! A new circuit to build. :lickface:

I am in the process of finally mounting my P30, built on your layout, into a case. I have the A class PSU built for it. The only thing I'm lacking is the MM28 phono circuit. If you get to feeling ambitious would you give a stab at a layout for it? I would love to have the complete setup. Here's the schematic.

Thanks, Terry
 

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  • APEX MM28.JPG
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