creatorlars Posted January 19, 2008 Report Share Posted January 19, 2008 Well my SEQ3 is done and finally in its case! I messed up one of the LCDs during assembly and had to wait for a new one to come in. This has been a laborious project for a beginner like me, but it is working (and working great!) I am successfully triggering my 808 bass drum and UD-1 drum voice modules via the Gate outs.Only problem, is after jamming for 5-15 minutes, the machine freezes... all of the panel LEDs stay on, but the LCDs fade out, and the buttons are unresponsive. If I reset the power, it boots back up with no apparent problems. This sounds like an easily diagnosable issue for someone who knows what they're doing, but I'm not experienced enough to really know where to start. The PSU has been working without a hitch so far and everything functions great (the encoders are occasionally a little jittery.) This problem has only existed since I mounted the panel into the case. I've checked for consistent ground, but could have messed up a connection somewhere. What would be the most likely culprits for a problem like this? Thanks very much for your advice. I'll have pics and soundclips up soon for you all. Quote Link to comment Share on other sites More sharing options...
creatorlars Posted January 19, 2008 Author Report Share Posted January 19, 2008 I've narrowed this down... the freeze doesn't happen until using the AOUT gates for 4-5 minutes. It'll run for an hour without the Gate outs connected to the modules. What could be happening here? Quote Link to comment Share on other sites More sharing options...
moxi Posted January 19, 2008 Report Share Posted January 19, 2008 hi,does your 7805 reg hold an heatsink? it's look like a thermlal problem (at least before you speak about gates out) Quote Link to comment Share on other sites More sharing options...
seppoman Posted January 19, 2008 Report Share Posted January 19, 2008 I've narrowed this down... the freeze doesn't happen until using the AOUT gates for 4-5 minutes. It'll run for an hour without the Gate outs connected to the modules. What could be happening here?did you follow this thread? http://www.midibox.org/forum/index.php/topic,10368.0.htmlif it depends on the CV connections, I would suspect it has something to do with ground loops.which PSU(s) do you use and how strong is it/are they?S Quote Link to comment Share on other sites More sharing options...
creatorlars Posted January 19, 2008 Author Report Share Posted January 19, 2008 I've got a big heatsink on my 7805, but it DOES get very hot, and is pretty cramped, it appears. Not sure what I could do, but maybe try to squeeze room for a fan? Doesn't make sense that using the AOUT would push the 5v regulator too hard, right?I'm using Ray Wilson's +/-12v PSU powered by a 2A 25.5VAC CT transformer. And feeding the 7805 directly from the +12vdc line. Maybe I should try adding a little board with a 7808 between the two to share the thermal load?I'll check out that ground loop thread. Quote Link to comment Share on other sites More sharing options...
creatorlars Posted January 20, 2008 Author Report Share Posted January 20, 2008 I decreased the LCD backlight brightness to minimum and noticed the 7805 heatsink was "warm" as opposed to "burning my finger"... and sure enough, no more freezing, so that seems to have completely resolved the issue. I'd still like to use the full brightness of the LCDs, though... so maybe I'll put a second regulator small board, and use that just to feed the backlights...Just had a two hour rehearsal with my band, which has been on hiatus waiting for me to finish up some of our new homemade gear... and the SEQ is great! Very happy. I'll post more soon. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted January 20, 2008 Report Share Posted January 20, 2008 feeding the 7805 directly from the +12vdc line.That's theoretically OK and practically a little ambitious ;)I'd be measuring voltages in a few places over time, to see what's going on... Quote Link to comment Share on other sites More sharing options...
ultra Posted January 20, 2008 Report Share Posted January 20, 2008 try this for your encoder issue.http://www.midibox.org/dokuwiki/fix_for_skipping_encoders Quote Link to comment Share on other sites More sharing options...
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