MegaFlash SCC+ no audio at all with several games

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By Wild_Penguin

Hero (638)

Wild_Penguin's picture

01-10-2011, 14:18

Oh, nice to see there is a proper solution for the mixer thingie on these Philips NMS'es!

I, too would be interested on the amp. luppie: sent you some email ;-).

Though, there is a lot of space inside these computers, I guess one could also use a breadboard for the amp - especially now that I have removed the disk drives Tongue

- Ville

By luppie

Paladin (862)

luppie's picture

25-10-2011, 08:37

Sorry for the late reply (real life catching up on me)
I've send you a reply on your mail.

Still have some opamps.

By faxerpelle

Expert (98)

faxerpelle's picture

14-11-2011, 14:25

Yesterday I've installed Luppie's opamp in my NMS8280 and I can clearly state now:

- this fantastic piece of hardware solves the problem perfectly. I didn't even have to adjust sound level with the trimmer, most probably it was already pre-set to a level ideal for my MSX

- MSXs are built in a very robust and reliable way. Even if I normally assemble my home PCs, it took a little to understand how to disassemble it correctly. Furthermore this was the first time with soldering on such small contact pins, so I was pretty sure I burned the PCB while trying to learn how to do that.

I can reccomend everybody to do this mod if you experience the no-audio problem.

Thanks again Luppie

P.S. inside NMS 8280 there is not so much space to place the opamp itself, I just found a free spot below the floppies on the lower mainboard. I fixed it with a drop of silicone and a layer of sponge (yes the one you use to wash your dishes) to avoid direct contact between the PCBs.

By Daemos

Paragon (1948)

Daemos's picture

14-11-2011, 15:15

glad to hear you like it Smile

By faxerpelle

Expert (98)

faxerpelle's picture

14-11-2011, 15:41

Yay, and it's also very cheap. 10 Euros is a bargain for the big problem it solves.

By roadfighter

Champion (419)

roadfighter's picture

29-12-2013, 18:09

Very nice mixer, and small.
Do you have the layout on your site Luppie ?

By Daemos

Paragon (1948)

Daemos's picture

30-12-2013, 12:23

@luppie:

you are aware that I updated the original design so that it now supports the audio inputs of two external cartridges. In this case. FMpak and SCC+?

EDIT: The design change is so minimal it can be done on the allready exsisting modules. I have not decouled the second input so it is only useable with FMPAK and moonsound like cartridges.

By Wild_Penguin

Hero (638)

Wild_Penguin's picture

09-11-2015, 17:54

Daemos (or anyone else): Can you elaborate on the new modification for two sound inputs?

I'm not having problems with it as it is (actually I haven't tested two sound modules at once ever before), but I've opened my NMS8255 to intall more RAM, I though I might update the OPAMP too since I needed to remove the cart slot assembly in any case ;-)

Thanks for your trouble!

By Daemos

Paragon (1948)

Daemos's picture

09-11-2015, 19:02

Send me an email I will send you the updated schematics if I can find them.

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