Crystal Clear Audio Mod for Sega Mega Drive 2 & Genesis 2, version 1.0

[Arnold101]

I want to know what makes it filtered or not so I can implement it as a choice in the next board revision.

actually your is unfiltered?

[Fleaman]

Where can you buy this board ? so that i can solder it in my console?

[villahed94]

Helder hasn't made any CCAM boards lately. Apparently he was making some boards with Ace's BA7230 YUV converter and MegaAmp boards.

[BlockABoots]

Is there a wiring diagram for a Megadrive 3 yet?

[Helder]

Helder hasn't made any CCAM boards lately. Apparently he was making some boards with Ace's BA7230 YUV converter and MegaAmp boards.

Hit too many roadblocks with the CCAM I designed and pretty much scrapped it in favor of the MegaAMP which in 2 weeks or so will have some prototype boards to mess around with, and if they function well I will sell the remainder of the small batch but 4 of the 10 are already reserved for people including 1 for myself.

[RyuX]

Hey guys

I just did the CCAM Mod to my MegaDrive 2.. i recorded a SOR2 BGM but i am not sure if it sounds correct? i hear some high frequency noise i dont know if that belongs there ?
Any suggestions ?

Also i heard another BGM13 of Streets of Rage 2 on youtube which sounds alot faster than my recording ? how is it possible that my genesis plays sound slower than another one ? (i also got a overclock mod, tried both 7,6 and 10mhz setting, no change).
The Noise doesnt seem to appear on other games like Shinobi III which i also did a test recording on..

Thanks
Patrick

[TmEE]

That is interference and it is caused b a factor of things such as too long wires, placement of the module over the ASIC or other chips.
Some of that noise is present in the audio signal already but not at this level.

[RyuX]

Hey thanks for your response. I shortened the wires and tried some other placements.. still it sounds the same on the streets of rage one.. i also tried swapping it to my JAP MegaDrive 2.. The sound plays much faster there.

Must be some sort of PAL / NTSC thingy, i read something about PAL/ EUROPEAN Mega drives be alot slower in terms of sound and even gameplay sometimes.

Will record something on my JAP one.. maybe a game that someone else with a CCAM has recorded already so it would be a much better comparison for me.

Greets

[KillerBean2]

Must be some sort of PAL / NTSC thingy, i read something about PAL/ EUROPEAN Mega drives be alot slower in terms of sound and even gameplay sometimes.

True, games that are not PAL-optimized run 17% too slow on an EU Megadrive.

I'm not sure about this, but the noise only seems to be present in the loud parts of the track, so some of it might be caused by clipping.
What equipment are you using for recording? Are you running the output through a preamplifier with a low supply voltage?

EDIT: Scratch that. Just saw your EU Megadrive in the other thread. I'm with TmEE on this one. Interference for sure. Those unshielded red wires running under the PCB are picking up all kinds of crap.

[RyuX]

Any suggestions how to shield it ? Thanks

Here is a M.U.S.H.A Recording from my Japanese MegaDrive 2 with the CCAM.

It sounds ok but when the sounds fade out i got weird artifacts.. but this has to be something else ?

M.U.S.H.A.
http://soundcloud.com/ryu-x/m-u-s-h-a-ccam-test/s-cgvXv

[KillerBean2]

Any suggestions how to shield it ? Thanks

Use coaxial cable and connect the shielding to ground in one or both ends.

[indianknightrider]

yQADt3.jpg

Can someone help me mod my console?
I can ship my Sega for the following mods,


heres what I need.

• Crystal Clear Sound Mod

• NTSC/Pal Swith

• Language Switch

• RCA Stereo AV Mod

I'm looking for a modder who is either in Asia, Europe or Australia.
Please Private Message me.

[GhaleonX]

I just ordered a CCAM board from RetroTimeGames and i'm not noticing a clear upgrade from my Genesis (model 2, VA 1.8) yet. I removed the caps it listed as 'optional remove' (CE1, CE7, CE2, CE5, CE9, CE6 and CE3, I cut the trace by C19, bridged R72, R73, Rdisabled the resistors at R24 & R27 and removed caps at all wiring points that go from the CCAM to the MD2 board.

I did replace some of the old caps. The new ones are same voltage and uf values, made by Elna. They say 85 degrees like the previous ones did - not sure about tolerance values for them.

On another note, I bought some Elna Silmac II capacitors from Mouser as they're supposed to be great for audio amps, and I have mixed results. I completely recapped my VA6 and VA7 boards with Silmac II's and some aluminum organic polymer caps. I haven't yet documented full behavior, but it seems odd I would be having this kind of behavior with fresh caps. Can anyone provide any insight as to the difference between capacitors that have the same voltage and capacitance ratings?

[GhaleonX]

I did some recordings to figure out what was going on. Apparently only the left channel was outputting sound. My scaler took this as mono audio and put it on both channels so I was getting an incomplete mix. I did some recordings which is when I noticed audio was only coming out of the left channel. After probing all the points with a multimeter to ensure the board was connected properly, I removed the CCAM and put fresh caps back into the audio circuit and verified that I had both channels working again, so the problem is either the CCAM board (Tiido's design; RetroGamer343's board) or the wiring diagram on RetroGameTime's website.

Here's a video of the captured footage with audio only coming in the left channel with the CCAM attached:
https://www.youtube.com/watch?v=_AEXkxqHubs

[AlmostOriginal]

Do you have any pictures of the pcb?