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Old 16th July 2004, 02:21 AM   #1
HV-MAN is offline HV-MAN  Australia
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Default MY AV400 project

OK this is what I'm planning for my HT a 5.1 set-up consisting of:

5 x AV400 amps from aussieamplifiers in monoblock configuration.
+ later on either the 800W or 1kW version for sub duties.


This is my proposed layout is attached.

I've been unable to find any cases I like so I going to have them fabricated. (attached to my next post below)
Basically a box with the Heat sink forming one end, Anthony also used this design I got the idea from his web page.

One of my concerns is that the case will have no vents....do you think this will be a problem?


-power supply
Basically I'm going to follow Anthony's recomendations.
500VA 230V/50-50V Toridal transformer, 400V 35Amp bridge rectifier into 4 x 10,000uF 100VCaps
Do you think 8 x 10,000uF cap would be better as I have room?
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Old 16th July 2004, 02:22 AM   #2
HV-MAN is offline HV-MAN  Australia
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And the rough case design.

What sizes does sheet metal come in? (metric please)
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Old 20th September 2004, 06:48 AM   #3
shyfx is offline shyfx  Australia
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Hi I am looking at building a pair of these amplifiers myself. Can you get away with a 500VA tranny for this amp? I am having trouble finding trannies but I can get a 500VA from Jaycar, which if what you say is what I think it is, then this tranny is suitable for the full 400W.

http://www1.jaycar.com.au/productVie...Max=&SUBCATID=

-Mikey
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Old 20th September 2004, 08:01 AM   #4
HV-MAN is offline HV-MAN  Australia
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Yep should be ok.

If you go the the link page on Anthony's web page he lists a supplier for transformers.

I'd consider going bigger if I was putting more than 1 amp in a enclosure but for my application the Jaycar 500VA transformer per monoblock worked out the cheapest.


I ordered 5 of them one for each of the 5 mono blocks I'm building, they took ages to come in.

I haven't had much spare time to work on my amp project.

I've got the heat sinks, capacitor, bridge rectifiers, Transformers etc.

I'm currently having the cases made by a friend.
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Old 20th September 2004, 08:24 AM   #5
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I recommend these if you're in Australia. Good quality, usually cheaper the Jaycar, made on the premises and hundreds to choose from.

http://ourworld.compuserve.com/homep...ch/harbuch.htm
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Old 20th September 2004, 02:24 PM   #6
shyfx is offline shyfx  Australia
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A friend and I are building them. I was planning on using the 3U rackcase from JayCar and hunting down the rest of the components wherever I could. I am not overly concerned with quality and expensive parts as I am only a uni student. Also this will be my first big high power amplifier so this would be a good learning process. I have built gainclones before with much success but now I need something with a shitload more power

I was planning on using a seperate toroid per channel, so the JayCar ones might do the trick it seems. I will get in contact with that link grege left and see what their prices are like. I am in Melbourne, so maybe with shipping it will work out the same, more expensive or hopefully, less.

-Mikey
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Old 8th November 2004, 05:04 AM   #7
HV-MAN is offline HV-MAN  Australia
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Some time has past, been quite busy @ work, hows a 1125MVA transformer grab you.

So far I have purchased 5 Toridal transformers and some large big *** heat sinks but haven't been able to commit to purchasing the AV400 PCBs with the knowledge that:
1/ the email requesting purchase would probably go unanswered or
2/ I'll end up with the PCBs and run into trouble like others here and have no backup etc.

I'm sure the Anthony's amps are good but support is a must.
On this note I've decided for the moment to can this project.

Anyone have a suggestion for a simular amp ?

I'm now looking at ESP 101P.... But I would like more grunt hence the original choice of the av400...
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Old 8th November 2004, 08:04 PM   #8
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Why can the project? There are a number of guys on the forum who have built these amps. If you are worried about support you can find it here. Secondly, your power transformer should be at least 625VA. Lastly, by the looks of your initial layout your heat sink looks small. Remember that it should have a thermal resistance of .5 degrees/watt.
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Old 8th November 2004, 10:11 PM   #9
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Thanks for the encouragement kilowattski.

I really like the spec of the AV400, fitts my plans quite well,
I've been reading about the problems others have had with the AV800, I don't really have the time to sort out problems like that.

Cost of the boards is also quit expensive @ $35 a board.
the p101 is currently $22 ea and has alot of support.

I'm still very undecided,
back to my original choice between the p101 (which has excellent support etc from what I have heard and seen) and the AV400 (which has the grunt but no designer support ).

My heat sinks are rated @ 0.37 deg/watt full specs attached.

As for transformers, I'm building mono blocks 500VA is more than plenty, 625VA is recomended for a stereo pair.


I'm tending to go for the p101 only for the following,
1- cheap boards
2- heaps of support etc


Any thoughts anyone?
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Old 9th November 2004, 01:02 AM   #10
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Well, the Holton amp is a lot more powerful, given the 4 pairs of output devices. The thing is, unless you're after that last bit of dynamic power or you have inefficient speakers, it's sort of pointless. Consider using that circuit for your main speakers and the Rod Elliott one for the others. (BTW, I can help with the AV400 if you do choose to build any.)
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