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A Directory of Apex Audio Amplifiers
A Directory of Apex Audio Amplifiers
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Old 1st June 2016, 03:27 PM   #1
xrk971 is offline xrk971  United States
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A Directory of Apex Audio Amplifiers
Default A Directory of Apex Audio Amplifiers

This thread is a consolidation of the numerous amplifier designs that member Apex Audio has generously provided the DIYA community over the past several years. The designs mostly come from the enormously popular (and large) thread 100W Ultimate Fidelity Amplifier which has become a bit unwieldy to use as a reference for designs. It is my hope that this thread will become a repository for Apex Audio's amplifier designs that is in an easily usable and searchable format. There are also several threads by Apex that have PA amps, etc - please consider providing links to those amps as well.

Note: click "Reload" page on your browser to auto scale the rather large image schematics. These are the original images as posted by Apex Audio. I only point to them.


To start things off, I have included below an initial list of amp designs that I could find using the search feature (I simply did a search for "AXn" where n is an integer representing the number of active devices). The problem is, there are amps named FXn, Bxn, An, Bn, ANn, etc. So it would be helpful if other members can point out designs that need to be added by posting here. From time to time, I will go in and update Post #1 to be an index pointing to the locations where the PCB layouts are located, the BOM, photos of working examples, etc.

When posting a suggestion for me to add to the index, please include the following in this order of importance:

1. Name of the amp, ie,, "AX11TEF" and rated watts and a note if special application like (uses lateral FETs or is fully-symmetric, etc)

2. An image of the schematic as drawn by Apex Audio (link to the image is fine), or if the amp is a mod by another member, a link to the member's schematic. Such as the FX8 Bimo Mod...

3. A link to the post or location where the amp design is discussed (either first mentioned or a key development where a working design is produced).

4. A link to the PCB layout sprint file or Gerber files if available

5. A link to the LTSpice/Multisim/TINA simulation file if available

6. A link to a photo of an actual amp that has been reduced to practice

7. A link to measured performance (FFT distortion plots, O-scope traces, etc.)

Thanks in advance for contributing to this index, and I hope you all find it helpful.

Finally, a huge thanks to Apex Audio for his tireless creativity and help in giving us so many great sounding designs to play with.

Regards,
xrk971

Update June 20,2016: Miro provided a nice table of 68 schematics here A Directory of Apex Audio Amplifiers




Here is what I have so far for the Index. I will add links to the above items as time permits and as people provide feedback.

#### AN INDEX OF APEX AUDIO AMPLIFIERS ####

Quasi for Beginners - added Aug 6, 2016:
Click the image to open in full size.

QUASI Amplifier for Beginners

SF3.1 AllFET preamp 470k input impedance - added 7/14/2016:

100W Ultimate Fidelity Amplifier

Click the image to open in full size.

SB3.1 BJT preamp 47k input impedance - added 7/14/2016:

100W Ultimate Fidelity Amplifier

Click the image to open in full size.

PSU + Protect - added 7/14/2016:
Click the image to open in full size.


Headphone Amp - added 7/10/2016:
Click the image to open in full size.

Class A preamp power supply 24v - added 7/8/2016:
A-class Preamp PSU

Click the image to open in full size.

PDF transfers:
100W Ultimate Fidelity Amplifier

SF1 all FET buffer - added 7/7/2016:
Studio Reference Amplifier

Click the image to open in full size.

PP8 SR Preamp - added 7/7/2016:
Studio Reference Amplifier

Click the image to open in full size.

Regulated PSU, output voltage with this PSU can be set from 35V to 65V 5A with single pair 2SA1943/2SC5200 - added 6/29/2016:
Click the image to open in full size.

PCB: Studio Reference Amplifier

4 Output version for 55v to 90v rails:
Click the image to open in full size.

More info (post #6):
Studio Reference Amplifier

Simple Stereo Protect - added 6/22/2016:
Click the image to open in full size.

PCB:
100W Ultimate Fidelity Amplifier

A3 - added 7/12/2016:
An externally hosted image should be here but it is no longer accessible. Please upload images instead of linking to them to prevent this.


FX7 - added 8/11/2016:
Click the image to open in full size.

100W Ultimate Fidelity Amplifier

FX8 (50w) - uses lateral FETs:
Click the image to open in full size.

(FX8 links provided by Jeshi on 6/2/2016)
50watt, NPN differential input, complementary NPN/PNP VAS, lateral MOSFET output.
APEX FX8 post 2125, APEX layout post 6174
Prasi initial PCB layout post 6160, Prasi/Sonal edited layout post 6184
Bimo-mod version with simulation post 6483 using 2SC1845 input, 2SA1381/2SC3503 VAS, 2SK1058/2SJ162 output.
Prasi layout of bimo-mod post 7146
FX8 Bimo mod build with speaker test results:
100W Ultimate Fidelity Amplifier

FH9 (50w) - xrk971 mod for vertical FETs:

A Directory of Apex Audio Amplifiers

Click the image to open in full size.

Tina Sim, Sprint and Gerbers:
100W Ultimate Fidelity Amplifier

PDF's:
http://www.diyaudio.com/forums/attac...4-top-view.pdf

http://www.diyaudio.com/forums/attac...silkscreen.pdf

http://www.diyaudio.com/forums/attac...opper-side.pdf

BOM:
100W Ultimate Fidelity Amplifier


FH9 fully built and tested by xrk971 using Sonal Kunal's Gerber files:
100W Ultimate Fidelity Amplifier

Note that I substituted 20k for 22k and 550R for 680R for resistors as shown in silkscreen. Also, final version uses BD139 as Vbe multiplier rather than MPSA42 as shown in Tina diagram.

FH9 HV - 120w (8R) output single pair vertical hexFET amp (requires swapping BD139/140's for KSC3503/KSA1381's):
100W Ultimate Fidelity Amplifier

A9 CFA:
Click the image to open in full size.

PCB pdf:
100W Ultimate Fidelity Amplifier

A10:
Click the image to open in full size.

CA10 - added 8/11/2016 (untested as of this date):
Click the image to open in full size.

100W Ultimate Fidelity Amplifier

N10 - 150w MOSFET amplifier with IRFP250 x2 - added 7/8/2016:
150W MOSFET Amplifier with IRFP250x2

Click the image to open in full size.

AX11 (50w):
Click the image to open in full size.

AX11TEF (50w):
Click the image to open in full size.

AA11 (class A):
Click the image to open in full size.

FH11 (250w 8R with 60v rails hexFET amp) Mod by xrk971 based on FH9HV design - added July 19, 2016:
Click the image to open in full size.

100W Ultimate Fidelity Amplifier

Simulation:
100W Ultimate Fidelity Amplifier

Verified build tested by Andrewlebon (note typo on MJE350 layout in middle of board - legs are ECB not EBC):
100W Ultimate Fidelity Amplifier

Built and tested by Still4given:
100W Ultimate Fidelity Amplifier


FH12 (mod to reduce dissipation on current mirror) - 0.039% THD at 1kHz 60v p-p output in simulation, not yet tested - added July 22, 2016:

100W Ultimate Fidelity Amplifier

Click the image to open in full size.


AX13 (50w?):
Click the image to open in full size.

A14 (CFA 35v rails) - added 6/22/2016
Click the image to open in full size.

Successful build and tested by Olafk:
100W Ultimate Fidelity Amplifier

PCB Files:
100W Ultimate Fidelity Amplifier

Sprint Files:
100W Ultimate Fidelity Amplifier

AX14 (80w):
Click the image to open in full size.

AX14 with dual outputs - mod by Vargas Mongo:

100W Ultimate Fidelity Amplifier


FX14 vertical MOSFET (80w):
Click the image to open in full size.

NX14 NMOS amp (80w):
Click the image to open in full size.

A15:
Click the image to open in full size.

AX15 (80w full symmetric amp):
Click the image to open in full size.

AX16 (80w):
Click the image to open in full size.

AX17 (80w):
Click the image to open in full size.

AX18 (80w):
Click the image to open in full size.

AX20 (120w):
Click the image to open in full size.

BX20 (w?):
Click the image to open in full size.

BX22 - added 6/24/2016:
Click the image to open in full size.

100W Ultimate Fidelity Amplifier
MM22 (phono preamp) - added 6/22/2016:
Click the image to open in full size.

HV23 (750w into 8R) quadruple vertical MOSFET amp - added 6/2/2016:

MOSFET Amplifier IRFP240/IRFP9240

Click the image to open in full size.

AX30 (w?):
Click the image to open in full size.

P30 preamp (24v rails, 300mV in 2V out) - added 6/22/2016:
100W Ultimate Fidelity Amplifier

Click the image to open in full size.

A33 - edit July 26, 2016 - note that resistor at offset trimpot is 470k not 470R per Apex.
Click the image to open in full size.

A40 (?w):
Click the image to open in full size.

F100 (80w into 8R) dual vertical MOSFET amp with DC servo - Apex says over 400 units installed and working reliably in bars/nightclubs etc, added 6/2/2016:

DC Servo MOSFET Amplifier

Click the image to open in full size.

H100 (80w into 8R) high efficiency class H amp - added 6/2/2016:

DC Servo MOSFET Amplifier

Click the image to open in full size.

HV250 - added 6/7/2016:
Click the image to open in full size.

H900 (900w into 8R) Class H high power PA amp output stage for use with separate VAS stage - added 6/3/2016:
http://www.diyaudio.com/forums/solid...limiter-2.html

Click the image to open in full size.

More info on VAS stage and PCB here:
A Directory of Apex Audio Amplifiers

BA1000 (1000w into 8R pro sound amp) - added 6/7/2016:

A Directory of Apex Audio Amplifiers

Click the image to open in full size.

B2000 - added 6/15/2016:
Click the image to open in full size.

Last edited by xrk971; 11th August 2016 at 01:08 PM.
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Old 1st June 2016, 09:42 PM   #2
xrk971 is offline xrk971  United States
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A Directory of Apex Audio Amplifiers
I will start things off with the FH9 - Xrk Mod, a 50w vertical MOSFET variant of the FX8 with a Vbe multiplier for thermal control. The circuit was something I modified in an effort to get away from the more expensive and harder to find Renesas lateral MOSFET used by the FX8. I simulated it on Tina and all looked good so I modified my existing FX8 and it worked well. It has since been built by another member.

Apex Audio named it FH9:
100W Ultimate Fidelity Amplifier

Schematic (note that Vbe multiplier was originally MPSA42 but that was changed to BD139 for convenient mounting hole):
Click the image to open in full size.

PCB layout:
Click the image to open in full size.

PCB pdf's:
100W Ultimate Fidelity Amplifier

PCB Gerbers:
100W Ultimate Fidelity Amplifier

Build photos:

Prototype mod from FX8 with Vbe multiplier on daughter board:
Click the image to open in full size.

Real PCB build by Zoky2:
100W Ultimate Fidelity Amplifier

Click the image to open in full size.

This amp PCB has been confirmed to work as shown by Zoky2.

Last edited by xrk971; 1st June 2016 at 09:50 PM.
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Old 1st June 2016, 09:49 PM   #3
jkuetemann is online now jkuetemann  Canada
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Just a quick comment:

Embedding the images as you have done makes the thread slow loading and impossible to view on some devices. Perhaps just a name, description and the relate to links to the main thread would have been better.
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Old 1st June 2016, 10:04 PM   #4
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by jkuetemann View Post
Just a quick comment:

Embedding the images as you have done makes the thread slow loading and impossible to view on some devices. Perhaps just a name, description and the relate to links to the main thread would have been better.
I am simply linking the images as they exist in the main thread - not embedded really. You would have the same problems just browsing the main Apex Audio threads because they are full of images. Images are what make it easy to find and use - and visually interesting. I don't have any issues with the images causing slowdown or bogging down my browser. I think the problem may be that some images are wider than the recommended maximum 1024 pixel wide limit as posted previously. If other members have the same problem with images being linked to display I will reduce to just url's. But this is the first I have heard of accessibility issues. Maybe I have really high speed reliable internet ? This was all done on my iPhone.
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Old 2nd June 2016, 12:02 AM   #5
koja is offline koja  Canada
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no accessibility issues. only some schematics are too big a size.
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Old 2nd June 2016, 12:08 AM   #6
nigelwright7557 is offline nigelwright7557  United Kingdom
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What a great resource.

However, I am having trouble knowing where intersects occur.
Some of the intersect dots are too small.
This makes reading the schematic very difficult.
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Old 2nd June 2016, 12:08 AM   #7
xrk971 is offline xrk971  United States
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A Directory of Apex Audio Amplifiers
Quote:
Originally Posted by koja View Post
no accessibility issues. only some schematics are too big a size.
I might have to take Apex drawings and rescale the bit maps to 1024 wide. Then upload as an attachment and then link it. Thanks fine pointing it out. It is big for me too but my browser automatically rescales to for if I click reload.

Quote:
However, I am having trouble knowing where intersects occur.
Some of the intersect dots are too small.
This makes reading the schematic very difficult
I have seen much worse and I think Apex's drawings are perhaps the best in this forum as far as readability goes.

Last edited by xrk971; 2nd June 2016 at 12:10 AM.
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Old 2nd June 2016, 02:35 AM   #8
gannaji is offline gannaji  India
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Default Apex A15

Just posting like this may be better ? One may post other details if available.
Attached Images
File Type: jpg APEX A15.JPG (496.9 KB, 12527 views)
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Old 2nd June 2016, 07:26 AM   #9
AndrewT is offline AndrewT  Scotland
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At the moment XRK971 and the Moderators have rights to edit post1.

Should Apex be added to that, so that he, the Designer can correct errors?
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Old 2nd June 2016, 09:56 AM   #10
xrk971 is offline xrk971  United States
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A Directory of Apex Audio Amplifiers
I would welcome it if Apex Audio could be added with edit rights to post 1. However - I don't think he has an interest in maintaining the index as he is busy designing amps.
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