+DarkLord Posted April 24, 2021 Share Posted April 24, 2021 Okay, I've got a specific need that I'm pretty sure someone around here has already done at some point in time. I use my Mega ST4 and SC1224 monitor to run my BBS, DarkForce. I'd like to do a small audio mod to bring sound out via a plug (1/8th?) to a small set of speakers. Reason being, to hear pages from the "Chat" option on the BBS requires that the monitor be on 24/7. I don't like that, even if I'm using the screen saver. With a mod like that, I could leave the monitor off but still hear the bell for Chat pages. Thanks. Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted April 24, 2021 Share Posted April 24, 2021 If I get it correct, you want to connect ST audio output to speakers. That will work only if those speakers have amplifier. Then just need to 'steal' audio from monitor cable, or connector at Atari - audio is pin 1 on 13 pin Atari video connector. GND is pin 13 (that solo one down) . Quote Link to comment Share on other sites More sharing options...
anzac Posted April 24, 2021 Share Posted April 24, 2021 (edited) Hope this helps Edited April 24, 2021 by anzac Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted April 25, 2021 Author Share Posted April 25, 2021 Thanks everyone for all the info. The stereo mod is a bit more than I need for this, so I'll be going with the single RCA jack out. PS Pretty sure that stereo mod was released commercially as the TweetyBoard... 1 Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted April 25, 2021 Share Posted April 25, 2021 Mega ST has no stereo audio at all. Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted April 26, 2021 Author Share Posted April 26, 2021 Right, the TweetyBoard design gave 3-channels out on standard ST's. Gave great sound, especially music but you had to equip it with a toggle switch to go back to stock because digitized samples did not play from it correctly. Quote Link to comment Share on other sites More sharing options...
tjlazer Posted May 16, 2021 Share Posted May 16, 2021 If you got one of those VGA adapter boards you could do just this and turn off the LCD. You would need a screen than can do 15HKz though like the NEC 1970vx. Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted May 17, 2021 Author Share Posted May 17, 2021 4 hours ago, tjlazer said: If you got one of those VGA adapter boards you could do just this and turn off the LCD. You would need a screen than can do 15HKz though like the NEC 1970vx. That's another option - thanks! Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted May 20, 2021 Author Share Posted May 20, 2021 Hmm, had my Mega ST apart yesterday and from what I can see, the black plastic cover over the video connector would make it extremely hard for a klutz like me to get to those 2 pins. Can they be pulled from an easier place on the motherboard? If not, does anybody sell a ready made ST video cable with audio out? Thanks all. Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted June 19, 2021 Author Share Posted June 19, 2021 Okay, I was told that the minus side of C35 on the Mega ST4's motherboard is audio out. Reading schematics or ID'ing things on printed circuits is not my strong point. Can some one please point out the minus side of C35 in these pictures? The + side seems pretty obvious. Thanks. Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted June 19, 2021 Author Share Posted June 19, 2021 Finally, with lots of help, I've got this installed. Even though it's mono, it's a huge improvement over the monitor speaker. I've got a pair of cheap Altec-Lansing speakers set up with it and it still sounds soooo much better. Thanks to everyone who pitched in, appreciated! Quote Link to comment Share on other sites More sharing options...
walter_J64bit Posted June 20, 2021 Share Posted June 20, 2021 (edited) That's awesome! When I got my STe and seen the audio out as RCA jacks. I used a RCA to mini jack so I can use my Creative SBS 20's With my STe! Edited June 20, 2021 by walter_J64bit Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted June 20, 2021 Author Share Posted June 20, 2021 My Mega ST4 is jealous though - you've got *stereo*! 1 Quote Link to comment Share on other sites More sharing options...
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