4 channel amp

[Jamh]

Here's a 4 channel amp I made with Brian's boards. I used 1/4in Aluminum for the inside, top and bottom plates, 1/2in Al for the front and back, and white oak for the side. It has a cute matching preamp, done in a smaller scale.

[Jamh]

The view of the bottom when flipped.

[Jamh]

With the matching preamp.

[Jamh]

Each side has its own transformer and power cord. They power two two-way speakers, each driver on its own channel. The sound is very good, detailed and spacious.

There is a slight hum that you can hear next to the speakers, but you can't hear it while playing music. Still, I worked hard to get rid of it. I insulated the signal cables, and added an aluminum plate as shield between the diodes and the chips. Each side has its own star ground and they don't touch each other. I tried a single star and it didn't matter. Might be the transformers, or the fact that I'm using Avel 25V 300VA instead of my usual plitron 20V 300VA. I should mention that my speaker drivers are really sensitive (~100db) so this might be normal.

[ble0t]

Very nice work! That's one solid case!

I working on something similar to that right now...hopefully it turns out as nicely as yours did

[Jamh]

Detail of one channel.