Starfire Posted January 3, 2011 Report Share Posted January 3, 2011 Ok so I soldered this up over the past week and it's working great! But I do have a couple questions. 1. I have a 5v regulator dedicated to just running the SIDS and it gets pretty toasty, is that normal? 2. When a patch isn't playing I can still here the oscillators running in the background very faintly, again normal? Thanks!! Here are a couple pics... Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted January 3, 2011 Report Share Posted January 3, 2011 congrats - looks like straight from back to the future - i wouldn´t recommend posting pics of 8580s to the public nowadays as there are reportedly crimes being commited to get them :-) what voltage are you feeding the 7805? don´t know about the oscs, i don´t hear them in the mb6582... Quote Link to comment Share on other sites More sharing options...
nILS Posted January 3, 2011 Report Share Posted January 3, 2011 1. A SID draws a max. of 100mA on the 5V rail, so other than an input voltage that's too high, there's no reason for the vreg to become hot. Why are you using an extra 7805 for the sid in the first place? 2. Yes, the VCAs don't necessarily completely cut off the signal Quote Link to comment Share on other sites More sharing options...
Starfire Posted January 3, 2011 Author Report Share Posted January 3, 2011 Was hoping to quiet some of the noise, which I did a bit (Not much to be worth it) my input is from a 12v regulated PS. The regulator running the PIC and LCD doesn't get hot, I find it odd that the other does, but everything works fine, I've checked voltages and they are all good also. Bought a couple old C64s off ebay to get those, I have an order in for the MB-6582 so I need more too! Still need 2 more 8580s (Have 2 on there way to me), was going to do 6 8580s and 2 6581s Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted January 3, 2011 Report Share Posted January 3, 2011 yes, then it is getting hot because of the high voltage difference - you can always install a larger heat sink or use a 9v psu - or leave it as it is, as they can handle some heat, as i know from my vfd experiments :-) Quote Link to comment Share on other sites More sharing options...
Starfire Posted January 3, 2011 Author Report Share Posted January 3, 2011 But I need the 12V to power the 9v regulator for the SIDs I guess I could get a larger 9V and power the 5V off of it, or just use the heat sink, I just would think the regulator powering the LCD and the PIC would get hot too, it's running of the same 12V Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted January 3, 2011 Report Share Posted January 3, 2011 (edited) do you have any c64 psus lying around from your ebay orders? If you are concerned about the heat, you could "copy" the power supply section of the mb6582... you would only need one c64 power brick and one voltage regulator for that - but i am too much a hardware noob to explain you how it works exactly :-) Edited January 3, 2011 by Hawkeye Quote Link to comment Share on other sites More sharing options...
Starfire Posted January 3, 2011 Author Report Share Posted January 3, 2011 I guess I was concerned about a short, but it wouldn't work then, at least it shouldn't. With my small aluminum piece on there it's not hot enough to burn you, but pretty toasty. I have to say I originally built with one sid, but adding the second for stereo effects increases the awesomeness of the SID sound 10 fold. On a side note, does anyone know of C128s had 8580s in there or 6581s, or both? Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted January 3, 2011 Report Share Posted January 3, 2011 they were both in the c128 tip - most versions of the c64-c with a "new keyboard" (look at the graphical character symbols on the keyboard to see the difference) have the 8580... but not all... i ripped 9 of them and still feel guilty about it ;-) Quote Link to comment Share on other sites More sharing options...
Starfire Posted January 3, 2011 Author Report Share Posted January 3, 2011 Yeah Thats where I got the 2 in that pic, but they have been thin on ebay lately. I did get one that had the right keyboard but hat a 6581 in it, I have 3 6581 so don't need anymore. I feel bad about it to but really, who's using C64s anymore besides for the sid chip like MSSIAH. Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted January 3, 2011 Report Share Posted January 3, 2011 (edited) I use them quite regularly, dude :) at least to play "Hawkeye", "IO", "Arkanoid II" and "Katakis" - any of these games beats Crysis hands-down :-) Edited January 3, 2011 by Hawkeye Quote Link to comment Share on other sites More sharing options...
Starfire Posted January 3, 2011 Author Report Share Posted January 3, 2011 Yeah Arkanoid was fun! I do still have my Atari 1200XL :D Quote Link to comment Share on other sites More sharing options...
Suicide Sushi Posted January 3, 2011 Report Share Posted January 3, 2011 (edited) I did get one that had the right keyboard but hat a 6581 in it, I have 3 6581 so don't need anymore. Maybe some people from the "Demo scene" are still using C64's. This demo is awesome btw :thumbsup: : . Even though it's on an emulator. Edited January 3, 2011 by Suicide Sushi Quote Link to comment Share on other sites More sharing options...
Starfire Posted January 3, 2011 Author Report Share Posted January 3, 2011 I plan on keeping one of the C64s I end up getting which ever has the nicest case. I never had one as a kid anyhow, just my atari. Gotta see if I can find a better heatsink I guess. Quote Link to comment Share on other sites More sharing options...
reboot Posted January 12, 2011 Report Share Posted January 12, 2011 very nice job !! Quote Link to comment Share on other sites More sharing options...
smashtv Posted February 8, 2011 Report Share Posted February 8, 2011 1. I have a 5v regulator dedicated to just running the SIDS and it gets pretty toasty, is that normal? Sorry to jump in I just saw this thread.... You really want the SID on the same 5v rail as the rest of the logic. Anytime you have a logic HI on the data lines driving the SID, you are tying the two different +5 power rails together. This can end badly for the weakest part involved. I'll greatly over simplify here and say you never want more than one source on a DC voltage rail, otherwise they get all competitive and fight each other. :) The long answer: any differential between the two regulator outputs (different trace lengths/wiring or even a few mV variation between two from the same batch) will have the higher source of the two doing all it can to bring the output voltage up to spec, while the other sees the higher voltage at the output and gets bitey. Depending on the regulator and circuit bitey might mean shutdown, oscillation, shutdown + draw like a big load, etc. There are ways to design around the issue - but not without losing some regulation. I agree with the boys.... good work! Best regards Tim Quote Link to comment Share on other sites More sharing options...
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