Background / feedback noise from TV.

By Hydragon

Hero (625)

Hydragon's picture

18-02-2018, 16:51

Hello, Current setup is my
- Philips CRT TV ( Scart connected! )
- Philips MSX2 NMS8245
- top slot : Memory mapper 1024Kb
- backslot: Slotexpander cartridge

Slotexpander order ( front to back )
- Panasoft FMPac ( MSX Music )
- F1 Spirit ( SCC )
- Philips Music Module
- Nowind USB Interface

Using Scart, the audio output is noisy, since FMPac and MSX Music are low on volume.
Problem: Lots of default background noise, noise sometimes even get worse if software switches screenmodes.
I guess more people are aware of this, how is it possible to reduce the noise, to make the sound clearer.

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By Wolverine_nl

Paladin (908)

Wolverine_nl's picture

19-02-2018, 16:26

Could be unshielded cables etc. internally inside the 8245. Did you try a Scart with a seperate audio-out plug? Sometimes this gives a slightly better result.

By Hydragon

Hero (625)

Hydragon's picture

19-02-2018, 18:36

Wolverine_nl wrote:

Could be unshielded cables etc. internally inside the 8245. Did you try a Scart with a seperate audio-out plug? Sometimes this gives a slightly better result.

Well thing is, Philips Music Module and Panasoft FMPac are unbalanced.
Philips Music Module is that low on volume, that you have to up the volume that much you can´t avoid having noise, only solution for this is using the external output ( ordered some cables )
When it comes to FMPac, it's unbalanced with PSG, when i used VGMPlay to play a tetris tune for example, the MSX Music sounded fine, untill PSG hopped in, which went way over the MSX Music tune.
I swapped it with MCWF FM-Pac and based on that I now have MSX Music, SCC and PSG balanced, without too much interference. It's now waiting for cables for the Music Module to perform more testing and balancing it.

By Wlcracks

Master (146)

Wlcracks's picture

20-02-2018, 19:48

HF noise can be filtered e.g.:
ferrite Beads

Worked for me in other situations.

By zett

Champion (428)

zett's picture

21-02-2018, 12:33

dont use a genarator of cheap made to power your msx. i know your side of nl no power yet but yeah.

By Grauw

Enlighted (7354)

Grauw's picture

21-02-2018, 15:43

Doesn't the Panasoft FM-PAC have a volume toggle switch so you can balance it?

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