AV400v2 - Another 400W Hi-Fi audio amplifier with remarkable sound - Page 1
Forum section: electronics / general

author: donpetru
author_rank: Contributor
timestamp: July 16, 2014, 05:02:53 pm
content: 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:2. TEST AV400v2 - MOSFET version: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 orAV400v2 Documentationcontains 10 pages with these "chapters":1. AV400v2 - Cover2. AV400v2 - Electrical diagram v2.1 and 2.23. AV400v2 - List of electronic components (BOM)4. AV400v2 - Indications for operation amplifier5. AV400v2 - All Layers PCB6. AV400 v2 - PCB Copper Top7. AV400 v2 - PCB Copper Bottom8. AV400 v2 - Drill InfoDOCUMENTATION(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 is17 USD/pcs. PCB.--------------------------------------------------------------------------------------------------I have available built units in two forms (without the heatsink):a) fully assembled at the price of85 USD / piece(see pictures below - in this moment only one piece available with MOS-FET).b) semi-assembly built units - price of82 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:tehniumazi@gmailcomFor more details please contact me via private messagingeevblog.com/forumor via email:donpetru@gmailcomAV400v2amplifier needs 1.2Vrms on the input in order to deliver nominal power. Supply voltages are +/-(40 ... 80)Vdc.

author: donpetru
author_rank: Contributor
timestamp: July 18, 2014, 03:05:43 pm
content: AV400v2 Basic technical specification:Typical class of amplifier operation: AB;Supply voltage: +/-40Vdc...+/-80Vdc.Power Output = 400 W - 4 Ohm; ~200W - 8 OhmTHD % = <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.

author: eetechTom
author_rank: Contributor
timestamp: July 30, 2014, 12:42:08 pm
content: What are the minimum power supply current specs?

author: donpetru
author_rank: Contributor
timestamp: November 23, 2014, 12:54:58 pm
content: Quote from: eetechTom on July 30, 2014, 12:42:08 pmSorry for the answer given so later, the answer was in one of the youtube clips posted above. I wrote on the screen the power transformer secondary and the secondary winding voltages (with and without 4 ohm load).2 pcs.PCB AV400v2 =25 USD(first 4 chapters of the documentation free included - including schematic)

author: tggzzz
author_rank: Super Contributor
timestamp: November 23, 2014, 03:20:52 pm
content: What sounds does theamplifiermake? I'd have thought that the sounds were made by loudspeakers, and that their imperfections would completely dominate any quarter-way decent amplifier's imperfections.

author: TheBay
author_rank: Unknown
timestamp: November 23, 2014, 04:09:35 pm
content: BJT for me all day long!I run a naim system which is BJT as are all naim's products, never really got on with mosfet personally.Love your project

author: donpetru
author_rank: Contributor
timestamp: December 11, 2014, 04:43:40 pm
content: 2 pcs. PCB AV400v2= only25 USDwith documentation included (chapters 1 to 4 included).!!!!!!!!!!!!Ship cost is about$10for users from the European Union.!!!!!!!!!!!!!!I have available built units in two version (without the main heatsink):a)fully assembled at the price of78 USD / piece(in this moment I have only one piece available with MOS-FET).b)semi-assembly built units - price of75 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.

author: donpetru
author_rank: Contributor
timestamp: March 07, 2015, 02:15:26 pm
content: Only 12 pcs. PCB AV400v2 available.