airmailed Posted January 17, 2008 Report Share Posted January 17, 2008 I've got some 1st gen OPL boards from smash that are being built now, I remmber that the resistor numbers printed on the board are wrong, If anyone has the correct values, could they let me know? Quote Link to comment Share on other sites More sharing options...
fizzicato Posted January 18, 2008 Report Share Posted January 18, 2008 Yep, the wrong resistors numbers made me to desolder lot of then when I looked it. The correct resistances distribution is on the Eagle file (.brd): http://www.ucapps.de/mbhp/mbhp_opl3_v1.brdor in the gif: http://www.ucapps.de/mbhp/mbhp_opl3_v1.gifBut not in the PDF. These are not good.Regards Quote Link to comment Share on other sites More sharing options...
airmailed Posted January 18, 2008 Author Report Share Posted January 18, 2008 thanks very much for your help fizzicato, my friend has already soldered one board, so some desoldering required i think Quote Link to comment Share on other sites More sharing options...
dj3nk Posted January 19, 2008 Report Share Posted January 19, 2008 write a short pm to TK. thx Quote Link to comment Share on other sites More sharing options...
TheAncientOne Posted January 19, 2008 Report Share Posted January 19, 2008 I've just been looking at the files on uCApps.The .GIF is wrong when compared to the parts list and the Yamaha data sheet.The sample and hold capacitors should be 2.7nF and the filter caps 68pF.The problem seems to be that the SmashTV board and the original uCApps boards use different parts numbering.The parts list on SmashTV's site is correct for his board: http://www.avishowtech.com/mbhp/mbhp_OPL3R1.htmlI've just noticed I've forgotten a link, so one of the IC sockets has to come off. Grrr!If it's a very old board, you're going to have to check back with the schematic. Just don't put 68nF caps on - you might not get much sound at all, that's a 25% increase in time constant!HTHMike Quote Link to comment Share on other sites More sharing options...
TK. Posted January 19, 2008 Report Share Posted January 19, 2008 I corrected the mistakes, and re-arranged the labels in the hope, that they are a little bit more readable now.(However, I must admit that it still looks ugly)-> http://www.ucapps.de/mbhp/mbhp_opl3_v1a.gif-> http://www.ucapps.de/mbhp/mbhp_opl3_v1a.brdBest Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
TheAncientOne Posted January 19, 2008 Report Share Posted January 19, 2008 Wow! that was fast!It's a lot more readable too - for my rather poor eyesight, having the component values in a contrasting colour help a bit too. I was talking the other day with a PCB designer friend, and he said that the modern trend on SMT boards is to leave most of the silk screening off, just label the connectors etc. The makers figure that no-one but themselves are ever going to work on them, and they might as well save the space. A scary thought for future modders.Best wishesMike Quote Link to comment Share on other sites More sharing options...
napierzaza Posted February 6, 2008 Report Share Posted February 6, 2008 So if I went the way Smash said, what will this do? I put together a smash board for FM some time ago and it never worked at all, are the components damaged or do I only need to swap out the correct parts for the mistakes listed?Also, I'd like a copy of the original gif or pdf so I can compare what exactly would be wrong on the board. I can't find any copies of what I have already made. Quote Link to comment Share on other sites More sharing options...
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