<![CDATA[ChipMusic.org - GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/topic/20561/gba-noisewhine-countermeasures/ Fri, 14 Sep 2018 05:20:06 +0000 PunBB <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/260008/#p260008 bitwise says:

So, i have found another gba for extremely cheap, tried the capacitor mod again (aka GBA NOISE FIX) and it worked! there's still some audible noise, especially on playback but overall sound got much better
Thanks, scannerboy!

]]> Fri, 14 Sep 2018 05:20:06 +0000 https://chipmusic.org/forums/post/260008/#p260008 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256507/#p256507 bitwise says:

It probably could happen because of the mod I did to motherboard for a backlit display installation.
But it's much more likely that i've messed up (mounting a capacitor, lol)

]]> Wed, 20 Jun 2018 12:28:08 +0000 https://chipmusic.org/forums/post/256507/#p256507 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256506/#p256506 scannerboy says:

Thats interesting. I modded 3 units with this cap and had no issues

]]> Wed, 20 Jun 2018 11:46:16 +0000 https://chipmusic.org/forums/post/256506/#p256506 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256505/#p256505 bitwise says:
scannerboy wrote:

Do I understand you correctly that the console stopped working after adding the capacitor?

It boots up but doesn't go any further than showing the gameboy logo.
It can boot only one time. after that I have to take batteries out of the device and wait for some time, so i can start it up once more.

Sorry for my english hmm

Also It's absolutely possible that I could have messed up something somewhere else.

]]> Wed, 20 Jun 2018 10:25:40 +0000 https://chipmusic.org/forums/post/256505/#p256505 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256504/#p256504 scannerboy says:

Do I understand you correctly that the console stopped working after adding the capacitor?

]]> Wed, 20 Jun 2018 09:28:17 +0000 https://chipmusic.org/forums/post/256504/#p256504 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256501/#p256501 bitwise says:
scannerboy wrote:

GBA NOISE FIX

Didn't help on the AGB-CPU-02. The device stucks loading, doesn't read cartridges.
Direct audio works, though.

]]> Wed, 20 Jun 2018 00:12:35 +0000 https://chipmusic.org/forums/post/256501/#p256501 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256500/#p256500 bitwise says:

Oooh, thanks for the help! Will definetly try as soon as I get close to the soldering iron smile

]]> Tue, 19 Jun 2018 06:17:11 +0000 https://chipmusic.org/forums/post/256500/#p256500 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256497/#p256497 ScanianWolf says:
shitbird wrote:

warning, There's not much room for more components. I had to break the inside of the case to get the rcas to fit on top. Also had to shorten and bend the prongs a little.

I'll keep that in mind, thanks! I have some really slim 1/8" jacks laying around and I think they'll do fine in the tight space. No bulky RCAs for me. But I'm also gonna leave the original GBA shell untouched and buy an aftermarket one.. They're pretty cheap and then if I mess up it wouldn't be a big deal.

scannerboy wrote:

R30 and R31 are basically the same points but on the other side of the PCB. Its just a matter of convenience

That explains a lot! Thanks for clarifying that!

]]> Tue, 19 Jun 2018 00:10:28 +0000 https://chipmusic.org/forums/post/256497/#p256497 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256496/#p256496 scannerboy says:
ScanianWolf wrote:

I've read somewhere here on the forums that points R30 and R31 are supposed to be pre-pot that one should solder to for a prosound mod..  Yours and Joes pictures seem more legit!

R30 and R31 are basically the same points but on the other side of the PCB. Its just a matter of convenience

]]> Mon, 18 Jun 2018 20:43:52 +0000 https://chipmusic.org/forums/post/256496/#p256496 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256493/#p256493 shitbird says:
ScanianWolf wrote:

I personally think I'm gonna go for a separate 1/8" output jack and drill a hole in the case because I'm gonna order parts (backlit screen, shell etc.) so that I can do it all at once.

warning, There's not much room for more components. I had to break the inside of the case to get the rcas to fit on top. Also had to shorten and bend the prongs a little.

]]> Mon, 18 Jun 2018 19:56:33 +0000 https://chipmusic.org/forums/post/256493/#p256493 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256491/#p256491 ScanianWolf says:
scannerboy wrote:

Also I use a super easy version of the prosound. You just remove 2 components to disconnect the amp from the output jack, and then you solder 2 wires to connect the cpu pins to the output.

If you dont like the prosound you just have to remove the wires and bridge the 2 components that you have removed.

GBA PROSOUND
GBA NOISE FIX

Those are some great protips! Thanks a lot!
I personally think I'm gonna go for a separate 1/8" output jack and drill a hole in the case because I'm gonna order parts (backlit screen, shell etc.) so that I can do it all at once.

I got this image from a friend that he dug up from some old facebook thread where Joe Bleeps shows his GBA prosound mod:
But I've heard conflicting information about those points, I've read somewhere here on the forums that points R30 and R31 are supposed to be pre-pot that one should solder to for a prosound mod..  Yours and Joes pictures seem more legit!

Edit: Gosh I'm blind, I just saw now that you highlighted the same points as Joe Bleeps.

]]> Mon, 18 Jun 2018 18:52:32 +0000 https://chipmusic.org/forums/post/256491/#p256491 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256490/#p256490 shitbird says:
bitwise wrote:
shitbird wrote:

The gba rca mod is worth doing.

Interesting. Is it any different from just soldering a jack between pre-amp in and ground?
oh yeah, i've also found a pinout of gba amplifier


Thats exactly what it's doing. It's not completely flawless, but it helps.

]]> Mon, 18 Jun 2018 18:39:07 +0000 https://chipmusic.org/forums/post/256490/#p256490 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256489/#p256489 scannerboy says:

Also I use a super easy version of the prosound. You just remove 2 components to disconnect the amp from the output jack, and then you solder 2 wires to connect the cpu pins to the output.

If you dont like the prosound you just have to remove the wires and bridge the 2 components that you have removed.

GBA PROSOUND
GBA NOISE FIX

]]> Mon, 18 Jun 2018 17:49:08 +0000 https://chipmusic.org/forums/post/256489/#p256489 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256488/#p256488 scannerboy says:
ScanianWolf wrote:

That capacitor in conjunction with a prosound mod I assume?

The effects are pretty audible without bypassing the amp

ScanianWolf wrote:

Would a 10Volts 1000uf capacitor do the trick or could I go even lower in voltage to avoid having a cap that's too big for the case ?

6.3V is enough

PS: I checked the polarity - left side is positive, right is negative

]]> Mon, 18 Jun 2018 17:24:13 +0000 https://chipmusic.org/forums/post/256488/#p256488 <![CDATA[Re: GBA noise/whine countermeasures?]]> https://chipmusic.org/forums/post/256487/#p256487 ScanianWolf says:
scannerboy wrote:

Regarding the noise. The best results I got were from soldering a 1000uf cap to both sides of C44 - - its beneath the big cap. I dont remeber the polarity tough

That capacitor in conjunction with a prosound mod I assume?

Would a 10Volts 1000uf capacitor do the trick or could I go even lower in voltage to avoid having a cap that's too big for the case ?

]]> Mon, 18 Jun 2018 16:46:48 +0000 https://chipmusic.org/forums/post/256487/#p256487