meech415 Posted December 12, 2010 Report Share Posted December 12, 2010 everything works great but the filter. it is super noisy and the cut off doesn't really cut. it only makes noise. on both sides. any body run in to this or have a tip ? Quote Link to comment Share on other sites More sharing options...
Wilba Posted December 13, 2010 Report Share Posted December 13, 2010 What kind of SID is it? Quote Link to comment Share on other sites More sharing options...
meech415 Posted December 13, 2010 Author Report Share Posted December 13, 2010 6582A Quote Link to comment Share on other sites More sharing options...
nILS Posted December 13, 2010 Report Share Posted December 13, 2010 Correct Caps correctly placed? Quote Link to comment Share on other sites More sharing options...
meech415 Posted December 14, 2010 Author Report Share Posted December 14, 2010 yes Quote Link to comment Share on other sites More sharing options...
meech415 Posted December 14, 2010 Author Report Share Posted December 14, 2010 my build partner has built many synths and wants to trouble shoot it from a schematic but there doesnt seem to be one for this box. we just built it and i recorded with it all weekend. i thought the filter in the chips must be dead. he doesnt think so. he is now looking for the pin out docs on the 6582. any ideas ? Quote Link to comment Share on other sites More sharing options...
nILS Posted December 14, 2010 Report Share Posted December 14, 2010 Like I said in your other thread, the schems are on ucapps.de. Since that apparently doesn't do here's some direct links :rolleyes: http://ucapps.de/mbhp/mbhp_core_v3.pdf http://ucapps.de/mbhp/mbhp_sid_v3.pdf The only thing relevant to the filters (assuming everything else works) are the two filter caps per SID. If a) everything else is working correctly, and b) the correct filter caps are placed correctly, the only possible issue left is your SIDs. Quote Link to comment Share on other sites More sharing options...
Flemming Posted December 14, 2010 Report Share Posted December 14, 2010 he is now looking for the pin out docs on the 6582. any ideas ? There has been built many hundred MBSIDs, both the modular ones, MB6582s and SammichSIDs - and they all work :) i can say for sure that the pinout of the SID has been tested thoroughly through many years, so i honestly think you should look for the error someplace else. Also the schems you ask for - these have been proven to work over and over again On a sidenote; it would be very peculiar if the two SIDs suffered from the exact same filter problem :unsure: Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted December 14, 2010 Report Share Posted December 14, 2010 a few questions/suggestions * did you test the all modes lowpass/bandpass/highpass and the combined modes? * is "ext in" off (if the sammich sid has that option)? * if you have a working C64-II (every good household should carry at least one :-)), you can test the 6582 in there, there should be some filter demos available. if nothing works: * can you post an audio example? Quote Link to comment Share on other sites More sharing options...
Flemming Posted December 14, 2010 Report Share Posted December 14, 2010 (every good household should carry at least one :-)) I couldn't agree more :thumbsup: Quote Link to comment Share on other sites More sharing options...
nILS Posted December 14, 2010 Report Share Posted December 14, 2010 can you post an audio example? I couldn't agree more :yes: Quote Link to comment Share on other sites More sharing options...
Wilba Posted December 14, 2010 Report Share Posted December 14, 2010 I suggest default patch #67 SEQ TranceBass, hold down middle C. Quote Link to comment Share on other sites More sharing options...
mouglie Posted January 17, 2011 Report Share Posted January 17, 2011 Looks like its a month since this has been posted, so i hope a solution has been found.. But i have the exact same problem with my sammichSID.. Everything works great but the filters are not really responding .. they make a bit of noise and little things happen.. but its totally not like the audio examples in the manual or like any other filter on any of my synths .. so something is definitely wrong.. Every voltage test checked out and the OS installed fine and well its all fine and rainbows except the filter part :/ .. Im using two 6581 SIDs. And one is from an old HardSID card i had so im very sure at least one of them is working perfectly. So i dont think its a problem with the SID chips. Could it be something with the C1L, C1R, C2L, C2R thingys? i used the 470pF (6581), but does it matter what holes i put them in?.. well hope someone can help :) Quote Link to comment Share on other sites More sharing options...
mouglie Posted January 17, 2011 Report Share Posted January 17, 2011 After looking around a bit on how you others assembled the sammichSID i could see that it was the way i put the C1L, C1R, C2L, C2R thingys in :D .. i dont know if it was that i put them in the holes furtherest apart or that i did not face them the same way that was the problem.. but when i put them both in the holes cloest to the middle and faced them the same way it worked ! .. now the filter is working perfectly :).. Quote Link to comment Share on other sites More sharing options...
XC3N Posted June 6, 2011 Report Share Posted June 6, 2011 Hi! Sorry to rez an old thread, but I have the exact same problem. I get a loud hum when the filter cutoff is set to 000 I get a softer hum when the filter is assigned to all channels ( 123 ) and with some combinations (I'd need to analyze it further...) Reading the last post, I tried to switch the filter caps around and, to my surprise, if I put them all facing right, the noise is even worse. If I put them facing left, the noise is not as bad but still present; maybe it's normal? The filters seem to be working fine otherwise, and I do get this problem on both channels/chips Thanks Quote Link to comment Share on other sites More sharing options...
TK. Posted June 6, 2011 Report Share Posted June 6, 2011 the hum could be caused by a too weak PSU. Check the SID supply voltage, it should be 12V on a 6581, resp. 9V on a 6582/8580 check it especially while the SIDs are plucked into their sockets and filters are turned on! best regards, thorsten. Quote Link to comment Share on other sites More sharing options...
XC3N Posted June 7, 2011 Report Share Posted June 7, 2011 yeah that's gotta be that because I remember the voltage was 8.7 or something like that :s The PSU rates at 15 volts though (obviously unregulated lol) I think it's 1A... should that be enough or should I look for another PSU? Thanks TK! I waited yeeeeears before I build my midibox but damn, it's everything I wanted it to be! Quote Link to comment Share on other sites More sharing options...
TK. Posted June 7, 2011 Report Share Posted June 7, 2011 nice ro read! :) your psu has the right specs, could it be that you are using a 6581 SID and mounted a 7809 instead of 7812 volatge regulator? (disclaimer if somebody else reads this posting without the previous ones: don't use a 7812 VR for 8580 or 6582 SIDs, they need a 7809 VR) best regards, thorsten. Quote Link to comment Share on other sites More sharing options...
XC3N Posted June 9, 2011 Report Share Posted June 9, 2011 Sorry, I thought I had replied but something didn't work! I'm using two CSG branded 8580s... Following the instructions on Wilba's "sammichSID building guide", I used a 7809 closest to the rear panel and the 7805 in the other spot... so I don't think that would be it the only thing is, I missed the part where it said to wait 20 secs in between soldering leads... I did work quickly, but I might have overheated the parts? Do you think that could be it? I'm noticing, with more playing around, that the midibox's mode (Ld, Dr, Mul etc) has an influence on how bad the filters sound... when dealing with, for instance, Dr, the Filter is unusable... Thanks for the help Quote Link to comment Share on other sites More sharing options...
TK. Posted June 9, 2011 Report Share Posted June 9, 2011 ok, i assumed that you are using 6581s since you forgot to mention this, and since 8.7V is in the good range for 8580s. There is probably no problem with the VR, it could just be a measuring error if you are using a low-cost meter (or measured from the wrong ground) Back to your original posting: could you please attach a sample where we can hear different filter modes, just to get an impression about the hum that you mean? Please also turn on/off the Ext. filter input - if enabled, you should hear a loud hum as long as no cable is connected to Audio In - nice comparison! Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
XC3N Posted June 10, 2011 Report Share Posted June 10, 2011 Yes I'm using a cheap ass meter =) I measured with the ground right next to the power entry. I will take audio samples tonight and upload them, as well as check the ext filter trick! Thanks again, will repost soon Quote Link to comment Share on other sites More sharing options...
XC3N Posted June 11, 2011 Report Share Posted June 11, 2011 (edited) ok let's try to embed some audio This is the idle noise on patch A041 - Math Game, followed by the idle noise on A040 - Ramp Up A041-MathGame -> A040-RampUp Here are some default patches that I figure are not sounding right: A063-Slow Intro A060-6 Octave Plug This last one is the Drum Kit 2 default patch, I assigned a LP to 123 and I'm gradually cutting from maxto min, and again, over the loop A034-Drum Kit 2 Cutoff Tweak EDIT(s): Ah, here is the EXT ON noise: EXT Filter on idle noise + Filter tweaks ...ok now my LCD is starting to flicker o_O like there is not enough power... Edited June 13, 2011 by XC3N Quote Link to comment Share on other sites More sharing options...
TK. Posted June 11, 2011 Report Share Posted June 11, 2011 My reply in ca. 4 days (currently don't have access to headphones... :-/ ) Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
XC3N Posted June 14, 2011 Report Share Posted June 14, 2011 I found the problem! My LCD was drawing waay too much current... I toned down the brightness dimmer a bit and now it sounds amazing! Thanks TK, this is amazing! Quote Link to comment Share on other sites More sharing options...
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