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AV400v2 - Another 400W Hi-Fi audio amplifier with remarkable sound
AV400v2 - Another 400W Hi-Fi audio amplifier with remarkable sound
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Old 14th July 2014, 06:04 PM   #1
donpetru is offline donpetru  Romania
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Default AV400v2 - Another 400W Hi-Fi audio amplifier with remarkable sound

First, AV400v2 is much improved amplifier compared to the old AV400 amp. So, AV400v2 is a personal version of the amplifier AV400 or, in other words, how should it look old AV400. If I've sparked your curiosity even a little, then I invite you in this topic to buy even a piece of PCB AV400v2 which includes documentation of the amplifier assembly (including circuit diagram). Documentation amplifier is printed on paper (black and white).

AV400v2 is a (400W - 4 Ohm) compact audio amplifier, Hi-Fi, with good performance, which we subjected to various tests, as you'll see in the videos below. In the two videos below (excuse me, I haven't made ​​a subtitle, but the images are quite suggestive), I tried to highlight what this amp is capable. Unfortunately, Xvid video quality is not the best, maybe even the sound (which is compressed to 192kb/s), but important things you can see see and hear.

AV400v2 is presented in two versions: AV400v2.1 and AV400v2.2 (using the same PCB). AV400v2.1 is MOSFET output transistor and AV400v2.2 is BJT output transistors.

1. TEST AV400v2 - BJT version:
https://www.youtube.com/watch?v=AzytSB64M6M

2. TEST AV400v2 - MOSFET version:

https://www.youtube.com/watch?v=hCpAUlpthC0

In recent years, I have performed various tests, especially with MOS-FET pair IRFP240 and IRFP9240 and, one thing revealed in many technical audio books, indeed, an audio amplifier with MOS-FETs sounds best if he sandwiched one driver pair transistors between VAS amp stage and output stage.
I even made ​​a comparison in this respect. In fact, both AV400v2 amplifier, and GX400 have passed in recent years by some tests - including tests of various topologies (example: Output Triple amplifier...) - and after this I got the version presented.

AV400v2 PROJECT or AV400v2 Documentation contains 10 pages with these "chapters":

1. AV400v2 - Cover
2. AV400v2 - Electrical diagram v2.1 and 2.2
3. AV400v2 - List of electronic components
4. AV400v2 - Indications for operation amplifier
5. AV400v2 - All Layers PCB
6. AV400 v2 - PCB Copper Top
7. AV400 v2 - PCB Copper Bottom
8. AV400 v2 - Drill Info


DOCUMENTATION (printed black and white) is valid in English.


PCBs prices are as follows (PCB size = 216 x 79 mm) :

1 pcs. PCB AV400v2 = 19 USD (includes printed above project to help in assembling the amplifier).

2 pcs. PCB AV400v2 = 36 USD (two pieces include with printed project mentioned above, to assemble the amplifier)

Who buys more than two pieces, the price is 17 USD/pcs. PCB.

I have available built units in two forms (without the heatsink):

a) fully assembled at the price of 85 USD / piece (see pictures below - in this moment only one piece available with MOS-FET).

b) semi-assembly built units - price of 82 USD / piece (I currently only available 4 pieces but depending on demand, I can assemble some extra).
WARNING! semi-assembly built units isn't soldered output transistors, drivers and bias transistor. So, these components will come separately along PCB. After that, depending on how the PCB clamping the heat sink, you have glue them.

Payment can be made via pay-pal at:

tehnium[dot]azi@gmail[dot]com

For more details please contact me via private messaging diyaudio.com or via email: donpetru@gmail[dot]com

AV400v2 amplifier needs 1.2Vrms on the input in order to deliver nominal power. Supply voltages are +/-(40 ... 80)Vdc.
Attached Images
File Type: jpg AV400v2 foto 1.jpg (493.5 KB, 1242 views)
File Type: jpg AV400v2 foto 2.jpg (514.9 KB, 1173 views)
File Type: jpg AV400v2 foto 3.jpg (435.3 KB, 1119 views)
File Type: jpg AV400v2 foto 4.jpg (440.0 KB, 1065 views)
File Type: jpg AV400v2 - foto 5.JPG (826.9 KB, 1030 views)
File Type: jpg AV400v2 - foto 6.JPG (836.0 KB, 279 views)
File Type: jpg AV400v2 - foto 7.JPG (816.2 KB, 216 views)
File Type: jpg AV400v2 - foto 8.JPG (821.9 KB, 224 views)
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Last edited by donpetru; 14th July 2014 at 07:15 PM.
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Old 14th July 2014, 07:21 PM   #2
Audio Elite is offline Audio Elite  South Africa
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Hi, can you do a 400 into 8ohm? How does it compare to a good high end power amp?

Last edited by Audio Elite; 14th July 2014 at 07:43 PM.
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Old 14th July 2014, 07:44 PM   #3
donpetru is offline donpetru  Romania
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Av400v2 Is 400W / 4 ohms.

Quote:
How does it compare to a good high end power amp?
It is an amplifier that works very well on low impedance, the sound is very balanced and dynamic; av400v2 amplifier is protected against overloading and short circuit on the output. I don't know what else I can tell you but has a amazing sound. Try it.
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Old 16th July 2014, 01:26 PM   #4
miero is offline miero  Czech Republic
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Can you show also scope image with clipping?
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Old 16th July 2014, 05:20 PM   #5
donpetru is offline donpetru  Romania
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Quote:
Originally Posted by miero View Post
Can you show also scope image with clipping?
you can see from the above youtube videos.

Quote:
Originally Posted by Audio Elite View Post
Hi, can you do a 400 into 8ohm?
An audio amplifier 500W/8Ohm (little more than 400W / 8 Ohm) will be AV800v2 that I will present next year.
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Last edited by donpetru; 16th July 2014 at 05:24 PM.
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Old 16th July 2014, 07:20 PM   #6
miero is offline miero  Czech Republic
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Sorry, these videos are long, in different language and without index.

Can you provide sheet with basic technical specification?

Also THD measurements should be done at least on the sound card if not audio analyzer. Resolution of used scope is not adequate for THD amplifier measurements.
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Old 18th July 2014, 03:35 PM   #7
donpetru is offline donpetru  Romania
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AV400v2 Basic technical specification:

Typical class of amplifier operation: AB;
Supply voltage: +/-40Vdc...+/-80Vdc.
Power Output = 400 W - 4 Ohm; ~200W - 8 Ohm
THD % = <0.1% / 400W.
Input Impedance = ~ 22K;
Input sensitivity to achieve maximum power output: 1.2Vrms/22Kohm.
Slew Rate => 20V/us (theory behind simulation = at least 35V/us).
Audio Amplifier efficiency: ~73%.
Signal-to-Noise Ratio: better than 100dB.

Regarding the THD measurement, indeed PicoScope software used for these measurements is not the best choice. In fact, even in the video say it, but not in english. However, measurement of THD that I made ​​are strictly informative, ie to form an idea of ​​what can amplifier. If I had a PicoScope on 16bit, things were different but, unfortunately, I own one 8 bit.
Maybe some buyers who have a device to measure THD much better. We'll see.
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Old 19th July 2014, 08:15 PM   #8
Audio Elite is offline Audio Elite  South Africa
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Quote:
Originally Posted by donpetru View Post
you can see from the above youtube videos.


An audio amplifier 500W/8Ohm (little more than 400W / 8 Ohm) will be AV800v2 that I will present next year.
That's a long time to wait any chance you can speed things up a little!

500 into 8 and 800 into 8 will be fantastic and if it sounds as good as you say, I think it will out sell your 200 versions.
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Old 28th July 2014, 07:40 PM   #9
mrsavage is offline mrsavage  United States
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AV400v2 - Another 400W Hi-Fi audio amplifier with remarkable sound
Default Design looks interesting but......

I purchased several PCB's for the BX400 Amplifier. I need Bill of Materials
and a larger schematic for the two possible versions of the BX400. I need this
information, in order to build this amplifier.I assumed when I purchased the
PCB's that this information would be included with the PCB's. Nothing extra
was included with the PCB's. A BOM and larger schematics should be standard
when you purchases PCB's. Especially when this information is not included
on diyaudio.com.
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Old 31st July 2014, 06:19 PM   #10
donpetru is offline donpetru  Romania
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@mrsavage, I answered here:
http://www.diyaudio.com/forums/vendo...e-romania.html

GX400 schematic I have not sent in the package because it was attached to the website: diyaudio.com
But who will buy AV400v2, will buy all the necessary information and documentation to build the amplifier.
In the case GX400, this information can be found in topic mentioned above.
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