ChipMusic.org - DMG bass mod

Re: DMG bass mod

2012-08-13T14:21:07Z

i think, more uF just means more buffer size and more filtering...i have tried out 1uF (standard) up to 20uF caps.
no really soundincreasing. maybe if you went under 1uF to the range 0.1~0.9uF.
i would rather play with the resistors right beneath the caps!
but grabbing the sound of right the cpu...mhhh i must check that out.

Re: DMG bass mod

2012-06-06T14:30:05Z

interesting thread,

Regarding to the GB schematics, they are coupling caps, to remove the DC offset, so if you remove them, you will get a DC offset in the headphone op amp and it will sound like crap. it could be better to add bigger value ..

What could be interesting is to connect prosound cables directly before the 1uf caps .(or on the CPU himself) and add new capacitor between the other side of the cable and the 1/8 prosound jack. so theoretically you will get the sound quite untouched for the headphone and better bassy sound for the prosound output.
Will try this with different caps value (2.2 u to 10u) when i got some time .. (as they are decoupling caps, to get more bass you should put bigger caps)

Re: DMG bass mod

2011-12-07T07:17:15Z

I have some insight, 3 years ago I replaced my caps for the same experiment http://www.flickr.com/photos/trash80/31 … 2041079668 ... Ened up using 1~2uf. Though Honestly the DC offset from the low frequencies is more trouble than its worth, you're better off just using a EQ after the cap rolls it off.

Also for anyone else, it's a bad idea to remove the caps altogether as its a buffer, at least, removing them AND doing a prosound mod. You can end up frying the cpu.

I don't know how I missed this thread until now.

Re: DMG bass mod

2011-12-07T04:14:00Z

have you guys done anything else with this? ive just acquired a bunch of gameboys from the flea market and im gonna replace the capacitors in a couple of them. i was thinking about trying smaller value on the audio filtering capacitors for maximal bass bumpage. anyone have any experience or insights here? i dont have a variable cap but im considering going out to get one for experimentating.

Re: DMG bass mod

2011-04-02T05:06:09Z

fuck yah

CV out from a gameboy!

Re: DMG bass mod

2011-04-02T04:34:18Z

ya didnt get around to trying out different capacitors. however threw in a half speed switch.

http://2playermusic.tumblr.com/post/427 … eed-switch

The other half of 2PLAYER is borrowing a DMG of mine and my second cart so I wont be able to force the slowboy to run at the proper tempo but i will try to capture some of the audio tomorrow.

Re: DMG bass mod

2011-03-25T16:51:38Z

Yeah, just experiment with lower values - less bass cut, rather than no bass cut (and a DC filter).

Re: DMG bass mod

2011-03-25T14:02:27Z

That's very likely. I'll probably be heading by an electronics shop today as I am teaching a friend how to mod/solder. I'll pick up some different caps.

Re: DMG bass mod

2011-03-25T07:25:29Z

How does the waveform look on the standard bass mod? To me it sounds like the pops could be from some kind of DC offset issue, which is not surprising if you start removing caps from things. Maybe you could just replace them with other caps.

Re: DMG bass mod

2011-03-25T04:30:09Z

interesting. about to do a mod with my gameboys. this might be a neat inclusion to that project, along with the prosound and other shenanigans. dont want to say what i am doing yet but its safe that this should yield some interesting results with nothing other than just a game boy.

Re: DMG bass mod

2011-03-25T01:25:41Z

glad to see your methodical reseach proces, thanks! im sure this will be help to people, it cant hurt to have some more well explored options.

+1 on the underclock crystal+ further research. keep it up!

Re: DMG bass mod

2011-03-25T00:27:18Z

Okay, followed up with some more testing

http://2playermusic.tumblr.com/post/407 … io-testing

Re: DMG bass mod

2011-03-24T16:36:42Z

What you hear in the mp3 I posted was not altered. Captured as is with my computer and cropped together. I made a mistake in how I described the prosound/bass mod audio. I started that it was compressed when in actuality it was merely clipping. It was late. I was tired. I'll check to make sure my blog accurately captures what happened.

Also going to try to grab the audio from the points before the caps to see if this will give the same results as removing them. Then we can keep the headphone jack and simply rewire a prosound.

I'll grab some more audio tonight and post pics of the .wavs so you can visually see the difference

Re: DMG bass mod

2011-03-24T16:12:50Z

Post some sound samples with flat eq settings on your mix, please.

I want to hear the "actual" sound not the mixed or mastered sound.

From my research the best setup for capturing proper DMG sound is to pro-sound mod your DMG with the wires connected pre-volume potentiometer so you get the full spectrum at full volume going into your mixer, recording console(line level input), or to a keyboard amp with a decent mic(I like the shure SM57 mic). Then do your mixing and mastering after you record the "raw" sound. I usualy add effects, mix and master a copy of the recording so I can keep a "pure" version of the original recording incase I need it for something.

Re: DMG bass mod

2011-03-24T14:25:32Z

Sorry fellas, realized my post may have been misconstrued. Referring to it

2. This audio is distorted. You can hear popping on the recording and it sounds like absolute trash
4. This audio clips when recording (loudest parts suppressed so it may all seem like the same volume) There is no popping and the audio sounds clear.

I will post the .wavs for comparison tonight. There is a little added umph in the bass so it may still be of practical use. Just need to keep experimenting