Looking for great amp project..Go Here

[Ian Mackenzie]

http://www.audioheritage.org/vbulletin/showpost.php?p=88443&postcount=54

Follow this link for details, I am NOT the designer and have no affiliation with Greg Ball other than he is located in Australia.

I do think however this design will slaughter anything commercial under US$3000 based on my auditioning including a lot of the absolute junk people around here insist on buying over on Ebay.

My motive for building this up is to enable comfortable listening in the Australian 40+ c summer days. The intention is to build up a 300 watt version for bi amping the woofers early next month.

Too hot for class A and in many ways its as good.

Ian

[hapy._.face]

Looks interesting. So, what did you think of it (your audition)?

[pelly3s]

great looking project ian i may have to do that myself its a lot cheaper than buying something already made

[Ian Mackenzie]

comments

http://www.diyaudio.com/forums/showthread.php?postid=827293#post827293

[yggdrasil]

Very nice work Ian.


Will order contact Greg immediately.

[hapy._.face]

Thanks, Ian! I think I might have to give it a go. I like the description you posted- sounds like my kind of amp!! Again, thanks!

Mike in Baltimore

[John]

Move over Boulder+Bryston:applaud:

[Ian Mackenzie]

Well for the bucks it might be the case.

[Flodstroem]

Hi Ian :D

Thanks for the tip. I shall order a pair of GB300 PCB´s for mono blocks.
Ian, do you know if there is any parts lists and manuals when only ordering PCB´s ?

Regards

[Ian Mackenzie]

You should get a pc and all parts to mount on the PCB, there is also a PS PCB and parts that go with it. Check with Greg Ball on the detail when you order.

You will need to acquire a heat sink and transformer.

Ian

[intotubes]

How big a tranny do you need? I have a couple form some other amp projects and want to know if I can use them if I built this.

Thanks,
Mark

[Ian Mackenzie]

Hi Mark.

Here is a link

http://members.dodo.com.au/~gregball/guru_005.htm

The instructions advise 300va 70VCT for +/- 50 vdc but you can use a 60VCT for +/- 45 vdc or as high as 72VCT for +/-55 vdc.

For more technical information contact Greg Ball here: [email protected]

[Ian Mackenzie]

Calling all 4343, 4344 and 4345 owners .....This amp still impresses me.

I played Terminator 2 Special Edition tonight loud, quite spectacular in DTS seeing and hearing steep wave fronts reproduced so cleanly and naturally.

I think this amp has to be the amp find of the year.

My order for the 300 watter job is going in next week.

Ian

[Robh3606]

Thanks Ian for the update. My HT is staying the way it is but the 2 channel with the 4344's I am looking to change around. Those amps look like a nice way to power the tops in a biamp set-up.

Rob:)

[Uncle Paul]

I'm thinking you could package the MOX electronic crossover boards and integrate the entire package.

Ian's probably already done this by now...

[Ian Mackenzie]

I could try but the star earthing might be awkward.

Good plan for the future.

Ian

[Hoerninger]

Hi,

although I'm relativ new here, the following link might be of interest, where a quite similar completely complementary and symmetrical amplifier is discussed:
W.Marshall Leach, Jr., Professor (Atlanta, Georgia),
The LEACH AMP
http://users.ece.gatech.edu/~mleach/lowtim/
and for the power hungry guys
The SUPER LEACH AMP
http://users.ece.gatech.edu/~mleach/superamp/

The circuits include a circuit protection (for the safety of your loudspeakers).
There is a circuit layout, but the rest should be done by yourself.
You will find some pictures of student built examples.

Greetings
Peter

[Ian Mackenzie]

It like most designs is similar bit NOT the same. The input stage is different and the design used vertical fets. The Leach design is complex, dated but a good learning curve for students.

I cannot publish Greg Ball's schematic because he has a patent pending and IP rights. The pcb layout is also critical to performance.

Greg has written various papers on amplifier design, if you wish to contact him directly I am sure he can oblige.

regards

Ian

[yggdrasil]

Finished mine yesterday. Had some problems since this is my first electronics DIY project.

I'm very pleased with the sound. Very controlled and dynamic.

[Ian Mackenzie]

Nice

Ian

[Flodstroem]

Finished mine yesterday. Had some problems since this is my first electronics DIY project.

I'm very pleased with the sound. Very controlled and dynamic.

Pretty nice work. :applaud: But Im a little bit jealous you have come so far with your project. :)
Im still in the collecting parts mode though I have received the 300W boards. Hopefully I will have the Conrads heat sinks and hi-fi2000 parts in the middle of July. PCB should be finished by then.

Regards

[Ian Mackenzie]

Here is a design update from Greg Ball which improves the PSRR another 20db on the input stage that I implemented tonight.

I think the results are audible, try it and find out for yourself.

Ian