Testing sound of different MSX sound chips and their FPGA implementations

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By KdL

Paragon (1222)

KdL's picture

13-07-2018, 11:31

Parn wrote:

@KdL, the image is not loading.

Here the gallery with all the images of 1chipMSX:
http://gnogni.altervista.org/1chipMSX.html

Also there are these two PDFs inside the original 1chipMSX CD-ROM, anyone could clone it:
http://gnogni.altervista.org/ocm/misc/emsx_pcb.pdf
http://gnogni.altervista.org/ocm/misc/emsx_sch.pdf

Zemmix Neo resistors networks:

By KdL

Paragon (1222)

KdL's picture

14-07-2018, 20:41

Good news for all the Zemmix Neo users! Big smile
Finally I got a noise reduction using the ground loop isolator.

https://twitter.com/ocm_pld_news/status/1018201915413364738

By Pencioner

Paladin (931)

Pencioner's picture

15-07-2018, 23:51

Smile thanks @KdL - i have just bought ground loop isolator (similar one to this, but i found it here in Sweden) - i will try it and make a recording

By KdL

Paragon (1222)

KdL's picture

16-07-2018, 14:27

Pencioner wrote:

thanks @KdL - i have just bought ground loop isolator (similar one to this, but i found it here in Sweden) - i will try it and make a recording

Okay I suggest you try also to exchange the input and output on it.
If your ground loop isolator does not have an improved volume amplitude, you may have a different noise reduction, I'll wait your recordings.

By Pencioner

Paladin (931)

Pencioner's picture

26-07-2018, 00:18

I will do and upload the proper recording soon, but i just tried that ground loop isolator and it seemed by hearing that it mangles/screws up the sound in the same way as the fix for Philips audio which i found in my MFR, so i did the quick test, i have recorded 15 seconds just now - and i see the same thing - no envelopes. So, i don't know about your ground loop isolator, but this one i got is definitely not for music listening. Sad but true

By syn

Paragon (1920)

syn's picture

26-07-2018, 01:04

What is the source of your ground loop? I "solved" my groundloop problem by simply connecting my speakers to ungrounded wallsocket (before, it was connected to the same powerstrip as my PC, the cause of the ground loop)

By Meits

Scribe (5485)

Meits's picture

26-07-2018, 02:19

If you're not recording it often helps to mute the line in. For audio guys that's not an option. I had one as well. Been searching for the source for years. After investing way too much money it turned out to be my pc's videocard. Is a usual suspect so it turned out. Very usual.

By KdL

Paragon (1222)

KdL's picture

26-07-2018, 12:40

By Pencioner

Paladin (931)

Pencioner's picture

26-07-2018, 16:24

@KdL : I would be happy if you can record first few seconds of the first track of this vgm rip and post it. I'd like to see if any ground loop isolator makes such distortion or not, and this track is perfect example though

@syn : I'm not sure if have this ground loop at all. It was like - "guys said that this whatever-isolator removes noise. so i'm gonna try it!"

By Meits

Scribe (5485)

Meits's picture

26-07-2018, 17:42

If the groundloop is still together with the audio signal, it can be split out with transformer grounloop killers. That should be a clean way. But once it's part of the audio signal (when it passed a mixer) you've to remove it with a groundloop killer that filters a frequency... This frequency can also be used by the music and therefore the music can be destroyed by it.

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