shmups.system11.org

Shmups Forum
 
* FAQ    * Search
 * Register  * Login 
It is currently Mon May 21, 2018 10:38 am View unanswered posts
View active topics



Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Sega Master System - Low Audio Volume
PostPosted: Mon May 07, 2018 2:29 pm 


User avatar

Joined: 05 Jun 2016
Posts: 112
Location: Ireland
Hey,

I have an NTSC SMS mk1 that has pretty weak/quiet sounding audio. Compared to my other consoles (all connected to gscartsw and OSSC) it sounds much quieter. Is this normal on some mk1 Sega Master Systems?

I have already replaced all the capacitors and installed Tim Worthington's FM sound mod....even after this it sounds quieter than my Genesis, Famicom, SNES etc. It's not super quiet or anything, but I definitely have to crank my AV receiver higher when using the SMS.

Is it possible to increase the volume by inserting some sort of audio amp, or even change the sound chip?

Any help would be appreciated! :D


Top
 Offline Profile  
 
 Post subject: Re: Sega Master System - Low Audio Volume
PostPosted: Mon May 07, 2018 2:37 pm 



Joined: 12 Aug 2017
Posts: 245
Analog audio gain was added in a recent OSSC firmware, maybe you could make a profile for your SMS?


Top
 Offline Profile  
 
 Post subject: Re: Sega Master System - Low Audio Volume
PostPosted: Mon May 07, 2018 2:48 pm 



Joined: 06 Oct 2012
Posts: 1097
Ive had genesis systems that had a bad Audio Amplifier Chip. Usually though the sound just doesnt work at all on them.

could be something to look into though.


Top
 Offline Profile  
 
 Post subject: Re: Sega Master System - Low Audio Volume
PostPosted: Sat May 12, 2018 12:01 am 


User avatar

Joined: 05 Jun 2016
Posts: 112
Location: Ireland
Thanks for the feedback guys, in the short-term I'll make an OSSC profile with higher audio gain (that's cool I didn't realise that, cheers for the tip!).

I might try source a replacement audio chip and see if that makes a difference also. :D


Top
 Offline Profile  
 
 Post subject: Re: Sega Master System - Low Audio Volume
PostPosted: Mon May 14, 2018 9:21 pm 



Joined: 06 Oct 2012
Posts: 1097
You can test it in different spots by using a pair of powered speakers and hooking some probes up to them.

Ideally you want an alligator clip on the negative speaker input and a probe on the positive input.

then you clamp the negative to a good ground on the motherboard.

Put a game in the master system and boot it. Get yourself a pinout of the relevant audio chips. then you can use the probe to listen to the audio outputs on the chips. If you hear nice clear sound, the chip is good. if you dont, its not.
Pin 9 on the CXA1145 should be your audio output.


Top
 Offline Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC


Who is online

Users browsing this forum: Fudoh, gray117, SamIAm, svensonson and 9 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Space Pilot 3K template by Jakob Persson
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group