Another completed ChipAmp.

[DC Dave]

I just completed this chipamp based on the LM3875. The project started with a trip to the local Goodwill store where I found these aluminum cones for 50 cents a piece. I was fortunate to find a forum member in Texas who helped me out by cutting the aluminum pieces for the bottom and internal structure. I switched to using Dale-Vishay RN60D resistors from Mouser instead of the Yageo metal film from Digikey I used in my first LM3875 amp. I also removed the input cap as well. The amps are still being broken-in, but sound very detailed and clear so far. There is no noise or distortion to be heard.

[DC Dave]

Here is what the insides look like. The tranny is an old Parts Express buyout. The LM3875 is mounted to the bottom panel. The chip is supplied with +-20 volts and the chassis does not get hot even after continuous use. The power supply board is mounted upside down under the tranny.

[DC Dave]

Here is a shot of the bottom of the chassis with the point-to-point LM3875 mounted on it and the tranny platform with the power supply board. The whole design is quite simple and works well. I was thinking of adding a copper shield over the amp section, but since I here no noise, I am going to wait.

[Variac]

Nice to see more p to p stuff. I think people forget that its an option, and not THAT difficult! They look good!

[rdf]

I love 'found' chassis like that, nice work! Now if you could just get smoke from the tops (intentionally.)