massimiliano Posted May 1, 2006 Report Share Posted May 1, 2006 i'm trying to build a new sid synth stuffed with an 8580 chip..the powering of the core is ok (around 5,3v)the lcd works correctlythe interconnection test is okthe voltage of the sid is around 8,90vwhen i play some notes i only ear small changes in the noise floor, i think that there is no problem on the 8580 chips.. because i have meny ones and the problem is the same with all my chips... and i can hear that the slight noisy sound is very similar to the sound of the patch i selecttryed to remove the crystal and connected to the j7 of the core... but the problem is the sametryed to use a different powering but nothing...thoug the voltages are ok the synth does not work.tryed to substitute the protection transistor but nothing...uff!with some other 8580 chips what i hear is only 50hz hum and when i play notes that hum is "modulated" by something that i don't understand...may be omething wrong in the core?i noticed that the current to the sid was too low (ca. 4,5v) so i used the same 5vdc to power separately the core and the sid (74hc595 section)used high quality cables for audio... nothingit seem that i hear the only typical sid noise floor (with relative changing, tuning, regarding the played notes) but not the sid sounds!!any idea?? Quote Link to comment Share on other sites More sharing options...
th0mas Posted May 1, 2006 Report Share Posted May 1, 2006 The capacitors c1 and c2.. are they shorting against each other? Quote Link to comment Share on other sites More sharing options...
Wilba Posted May 1, 2006 Report Share Posted May 1, 2006 Where did you get your SID chips? You cannot assume that all your chips aren't dead. Quote Link to comment Share on other sites More sharing options...
TK. Posted May 1, 2006 Report Share Posted May 1, 2006 Have you already tried the mbsid_interconnection_test and the sid_testtone application?Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
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