The definitive GC motherboard trimming guide

Ashen · **Posted:** Wed Aug 17, 2011 10:58 am

I knew I forgot something.

I'll update the main post later.

Alie · **Posted:** Wed Aug 24, 2011 12:17 pm

On PAL gamecubes composite video is on pin 7 of the audio/video chip, not on pin 9, please add that...

Tchay · **Posted:** Thu Sep 08, 2011 2:56 pm

It should be noted that you need AT LEAST 5v to properly power the on board AMP.

Many of you have been having issues with the sound be staticy in terms of bass. I just toggled 3.43v versus 5v and when using 5v, there is no sound problem. However, using 3.43v causes the sound to have a staticy bass to it.

Now, according to Zenloc, you should be able to get rid of the on board amp and use your own amp. Most amps require 5v, but maybe you can get away with 3.43v and properly power the amp.

Later on, I'm ganna try 7.4v to the amp to see if it fries it. Since I don't wanna buy another regulator just for 5v to the amp.

Tchay · **Posted:** Thu Sep 22, 2011 2:58 pm

Okay I tested 7.4v. The on board amp appears to work fine. No sound distortion or anything like that.

I will be using the full 7.4v in my Gamecube Envision. Hopefully there isn't any longterm damage from using a higher voltage.

Ashen · **Posted:** Thu Sep 22, 2011 3:35 pm

Why would 7.4v hurt the audio amp? It normally takes 12v.

Edit: Also, if your considering JUST using the GC's built in audio amp to run your speakers it will work, but you won't get very loud volume I think. The onboard amp is only meant to be a preamp.

SonyQrio · **Posted:** Thu Sep 22, 2011 4:36 pm

I think he might mean his actual audio amp... not the preamp. Like an ipod audio amp that takes 5v.

Tchay · **Posted:** Thu Sep 22, 2011 8:07 pm

Ashen wrote:

Why would 7.4v hurt the audio amp? It normally takes 12v.

Edit: Also, if your considering JUST using the GC's built in audio amp to run your speakers it will work, but you won't get very loud volume I think. The onboard amp is only meant to be a preamp.

Yeah right after posting that I realized it normally takes 12v :facepalm:

And I will have another amp besides the preamp.

Tchay · **Posted:** Mon Dec 12, 2011 11:47 am

*****It should be noted that in some cases, if you DO NOT have the filtering caps for L and R audio wired up, you WILL NOT get sound.

More testing needed to see if this is always the case, but with my current motherboard, wiring directly to the AV chip will not yield sound. I have to wire sound the filtering cap which then is wired to the AV chip.

Ashen · **Posted:** Mon Dec 12, 2011 12:49 pm

Tchay wrote:

*****It should be noted that in some cases, if you DO NOT have the filtering caps for L and R audio wired up, you WILL NOT get sound.

More testing needed to see if this is always the case, but with my current motherboard, wiring directly to the AV chip will not yield sound. I have to wire sound the filtering cap which then is wired to the AV chip.

I find this EXTREMELY odd man, it makes me think that you are either doing something wrong, or you are doing something wrong.

ShockSlayer · **Posted:** Mon Dec 12, 2011 1:07 pm

It doesn't make any sense, no, unless the chip can sense power draw or something.

SS

[Guide] The definitive GC motherboard trimming guide

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