ToFiC Posted March 3, 2009 Report Share Posted March 3, 2009 I've finished it about 2 weeks ago, but had no time to make a report. I didn't take time to make photos during assembly :PI first made a 4 x 6582, 2 x 8580 and 2 x 6581 config but i found it too noisy so i bought 4 other 6582 from Wilba.LEDS are very bright, i have to buy 1k ohm resistors to fix this. I have some strange things to fix:- LED 1 from oscillator section doesn't lit. I've replaced it and checked everything around but found nothing wrong.- left side from SID 4 sounds lower than the other ones. I've also checked everything but not found what is wrong.I also have a question:- on the four sids (not on the 4 because i've something else to fix) when playing a single bass drum (bd1) i hear it louder on the left side. I thought it was "Vas" setting but i can't find how to set this. Perhaps it is normal working?More questions coming later, it's hard for me to translate, school is far, my english is bad :P Quote Link to comment Share on other sites More sharing options...
Wilba Posted March 3, 2009 Report Share Posted March 3, 2009 Congratulations!- LED 1 from oscillator section doesn't lit. I've replaced it and checked everything around but found nothing wrong.Does Osc waveform Saw LED work?Test continuity between Osc 1 LED (left pin) and Osc waveform Saw LED (top pin).Refer to the PDF of the PCB layout to see what I mean... note top layer track joining these LEDs. This is the only track leading to the faulty LED which could be broken, since you do not report Osc 2 or Osc 3 being faulty (which share same track on cathode) or that the Mod Matrix Target buttons (O1 pitch, O2 pitch, etc) are faulty.- left side from SID 4 sounds lower than the other ones. I've also checked everything but not found what is wrong.You could try replacing the transistor in the audio buffer.It might also be something strange about the passive mixer. Check R70-R77 (the resistors below the audio sockets). They should all be 10K. Quote Link to comment Share on other sites More sharing options...
TK. Posted March 4, 2009 Report Share Posted March 4, 2009 - on the four sids (not on the 4 because i've something else to fix) when playing a single bass drum (bd1) i hear it louder on the left side. I thought it was "Vas" setting but i can't find how to set this. Perhaps it is normal working?I'm not sure what you mean with "bd1"...VAs is only available for multi and drum engine patches to assign the voice to a specific oscillator, to a specific SID (L/R) or to use auto allocation (default).Usually we only want to use a single oscillator per drum sound. We have two SID chips per core, accordingly 2*3 oscillators. The two SID audio outputs have to be "merged" with a mixer (or in your DAW), e.g. by enabling a Mono function.However, this doesn't explain why you hear it louder, which implies, that you can hear the same sound on the other audio channel, which would be wrong. Maybe a crosstalk issue?Or do you refer to a lead patch which plays a stereo sound?Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 Thorsten:Oups! :D Sorry, i didn't understand it like that. I made my tests with a stereo header and i didn't even think to try side by side. When playing drums i thought it was a panning setting of the different instruments... shame on me :DWilba:I'll check this this evening. I also will make some extra photos.Thanks! Quote Link to comment Share on other sites More sharing options...
Goblinz Posted March 4, 2009 Report Share Posted March 4, 2009 Wow... somebody's managed to take some in-focus pictures!Looking good and nice to see you've not drilled the front panel.I quite like the way that the LEDs light up the white stripe on the knobs. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 4, 2009 Report Share Posted March 4, 2009 Wow... somebody's managed to take some in-focus pictures!I can't see images on ImagesHack :(Offsito doco mutter mutter </broken record> Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 I can't see images on ImagesHack Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 4, 2009 Report Share Posted March 4, 2009 Sweet! Yeh I'm with Goblinz, the light on the knobs looks fancy :)Thanks for the onsite pic! Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 Yes this blue light is cool but it's to bright, et hurts my eyes :)I'm going to put 1k ohm resistors to solve this. We'll see if the led will still light the knobs after. Quote Link to comment Share on other sites More sharing options...
Futureman Posted March 4, 2009 Report Share Posted March 4, 2009 I quite like the way that the LEDs light up the white stripe on the knobs....And the back of your eyeballs. ;] Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 It's OK for my oscillator number 1 LED, link to saw waveform was broken. I've made a bridge.I've replaced the audio buffer BC547, re-checked everything around but sid four left channel still sound lower ??? I'll have to work on it. Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 PhotosIMG_5627.JPGIMG_5629.JPGIMG_5632.JPGIMG_5627.JPGIMG_5629.JPGIMG_5632.JPG Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 photosIMG_5633.JPGIMG_5634.JPGIMG_5636.JPGIMG_5639.JPGIMG_5633.JPGIMG_5634.JPGIMG_5636.JPGIMG_5639.JPG Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 4, 2009 Author Report Share Posted March 4, 2009 photosIMG_5641.JPGIMG_5643.JPGIMG_5641.JPGIMG_5643.JPG Quote Link to comment Share on other sites More sharing options...
Futureman Posted March 5, 2009 Report Share Posted March 5, 2009 I've replaced the audio buffer BC547, re-checked everything around but sid four left channel still sound lower ??? I'll have to work on it.1- How much lower? One of my Sids has a slightly different level.. not much, but enough to effect the stereo imaging in my headphones.2- Have you moved around the SID chip to see if it follows the SID?3- Have you checked the resistors in the passive mixer? (Near the Jack sockets)RegardsMike Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 5, 2009 Author Report Share Posted March 5, 2009 Hi,i've moved the right and left SIDs, it still sounds lower on the left. This is not the sid.I visually checked all resistors near the SID and the audio out. I'll check them with my multimeter.For the difference of volume i don't know how to tell you the difference :) It's really low, there is a real problem. Quote Link to comment Share on other sites More sharing options...
Wilba Posted March 5, 2009 Report Share Posted March 5, 2009 if it's REALLY low (barely audible) it might be the 9V (or 12V) supply to the SID itself.Using the testtone app, can you test just the audio buffer circuit by taking the SID out and bridging pins 8 and 27 with a 1K resistor?This will generate a 1kHz square wave tone (same as the testtone app makes with the SID) by toggling pin 8 at 1kHz, which is thus connected to the audio buffer circuit at pin 27 (the SID's audio out pin).If the volume of this test tone is the same as the other SID module (you can test both at the same time), then the audio buffers are probably not the problem at all, and it is something wrong with the SID in the socket, like the voltage at pin 28 is not right.I recall someone else having this problem, they didn't put the jumpers to select voltage for each SID, and so the SID only got the 5V supply and not the 9V (or 12V) supply, thus the internal audio amplifier wasn't working.*** if you are feeling really brave, you can try to temporarily touch a wire between pin 28 of a working SID and pin 28 of the not-working SID, but be careful not to touch any other pins while you do this!!!! *** Do that with testtone app already running and all your audio ready to hear a difference. You are probably using 6582 SIDs ;) so the chance of frying the other SID is low, as 9V inserted into other pins are unlikely to do any damage. Quote Link to comment Share on other sites More sharing options...
ToFiC Posted March 5, 2009 Author Report Share Posted March 5, 2009 *** if you are feeling really brave, you can try to temporarily touch a wire between pin 28 of a working SID and pin 28 of the not-working SID, but be careful not to touch any other pins while you do this!!!! *** Do that with testtone app already running and all your audio ready to hear a difference. You are probably using 6582 SIDs ;) so the chance of frying the other SID is low, as 9V inserted into other pins are unlikely to do any damage.Ok, thank you for your help :) I will do that this evening if i have time to. Quote Link to comment Share on other sites More sharing options...
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