Looking for great amp project..Go Here

[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. 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