Weird Gamecube audio problem

[hailrazer]

I'm playing around with a GCP.

I have a 1.9v, 3.3v, 5v regulator on the respective lines. Plus 7.4v to the 12v audio line.

I am using an audio amp from a ipod speaker.

When I hook it all up I get a loud hum through the audio. When I leave it all hooked up but run the audio amp by itself with separate 7.4v battery, no hum.

The only thing I can think of is some kind of ground loop.

The board is trimmed but only the outside gold grounding area. I see a cap I "may" have trimmed off on the very corner near the power pads. But I have hooked up a 100uf cap there and no difference.

Any ideas?

 

[Ashen]

I had this issue with the iLuv setup you recommended (thx!). I switched to shielded wire and wired the ground straight to the one of the ground legs of the GC audio amp and all is well.

I also figured out how to get the iLuv to turn on with the system if you're using that specific setup and don't already know.

 

[hailrazer]

Thanks but I'm not using the iluv.

I'm using the RadioShack fold able ipod speakers.

http://www.unknownmagazine.com/cubecart ... view=write

 

[bud]

I had this issue with the iLuv setup you recommended (thx!). I switched to shielded wire and wired the ground straight to the one of the ground legs of the GC audio amp and all is well.

I also figured out how to get the iLuv to turn on with the system if you're using that specific setup and don't already know.

I wouldn't mind hearing how you got it to turn on with the system.

 

[Ashen]

Quoted from my worklog.

Finally figured out how to get the iLuv audio amp to power on at system start. I should just start looking at datasheets i guess as it seems to save me lots of time and frustration. For those interested, just input 4.5/5v to pin 12 on the audio amp chip of the iLuv http://www.poweranalog.com/pdf/PAM8403.pdf that will get you power at power on and bypass the need to press the on/off tact switch

Only a bit of wiring to do now then I can close this puppy up and jam some MP

 

[hailrazer]

Fixed it.

Turns out is was the wire. I was using controller wire. Guess it was to small. Weird.

Put on regular 22 gauge power wires and it works perfect.

Sigh......

But thanks Ashen

 

[Ashen]

Sure thing man. Good to know for next time. I was using IDE wire when I was having this problem, next time I'll try some higher gauge stuff instead of shielded and see how I make out.