Stigmata Posted November 17, 2002 Report Share Posted November 17, 2002 Just discovery that my SID 6581 get very hot, is that normal? ???Take care!Christoffer Quote Link to comment Share on other sites More sharing options...
Stigmata Posted November 17, 2002 Author Report Share Posted November 17, 2002 My Dc transformer get like 16,50 V= and I supply the SID and the core.Is that wrong?Discover that its works just fine but after a while the SID start to hang up, and dont response at all!Hmmmmm!!Somethings wrong I suppose.. :-/ :(Christoffer Quote Link to comment Share on other sites More sharing options...
Stigmata Posted November 18, 2002 Author Report Share Posted November 18, 2002 Seems like one of my SIDs working just perfect (6581)and one of them (the one thats hot)dont works with the cutoff filters, got the same sound)....... ???Christoffer Quote Link to comment Share on other sites More sharing options...
TK. Posted November 19, 2002 Report Share Posted November 19, 2002 The SID gets hot, thats normal. It's just good old analog stuff! :-)If the SID hangs up, it might be the reason that something influences the data transfers between the core and the SID module. I mean that ESD issue... e.g. if you have a temperature regulated soldering iron which switches on/off sometimes, this can cause unwanted transients on the data lines which disturb the data accesses. Or if your mobile phone rings during a SID session, the data flow could also be disturbed.Solution: build the circuit into a metal case like known from "real" synthesizers...You are writing that the cutoff frequency of one chip cannot be controlled. I hope that this isn't a 8580?Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Stigmata Posted November 19, 2002 Author Report Share Posted November 19, 2002 No Its not the 8580 chip.. ;) I just tried to change the two SIDs between the core and the sid pcb ,got same problem.....Christoffer Quote Link to comment Share on other sites More sharing options...
TK. Posted November 21, 2002 Report Share Posted November 21, 2002 You mean that one of the chip gets hot and has no functional cut-off effect? It seems that this chip is either damaged (after 20 years this could happen...) or a different chip-revision which requires another capacitor pair (C1/C2). You could try two 1 nF or 2.2 nF if available.Btw.: Since I built the MIDIbox SID I've tested 4 different SIDs and noticed that every chip has it's own sound ;-) --- especially the filters varying a lot.Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Guest drummond Posted November 21, 2002 Report Share Posted November 21, 2002 Just an idea: glue a heatsink on the chip. Maybe it's just going weird because it's too hot... Quote Link to comment Share on other sites More sharing options...
Ian_Hurlock Posted November 21, 2002 Report Share Posted November 21, 2002 YeahMy sids 6581's also got hot. I had a similar problem with lockups. I hav'nt rebuilt yet until the control surface"surfaces'. Think I'll be adding some heat sinks though !!I had an ensoniq pci for midi and it would send some weird message every 50 events and trip the whole thing.That card is now in two pieces on the ceiling of my studio !! 8)I got a different sound out of all ten sid's I tested.I even ran a 8580 on 12volts !! still goes !ian Quote Link to comment Share on other sites More sharing options...
Stigmata Posted November 21, 2002 Author Report Share Posted November 21, 2002 Ok!I Should test the heatsinking stuff....Dont think i should test the different caps becuse i checked the C64 pcb an only find the 470 on both... :-/Thanks for the help!Christoffer Quote Link to comment Share on other sites More sharing options...
TK. Posted November 25, 2002 Report Share Posted November 25, 2002 Just a question to Ian and Christoffer: are you using an 1 MHz oszillator for the SID, or is the SID clock input supplied by the PIC? Because this could be the only difference between my own SIDs and yours, and my SIDs are running hours without any failure, and I neither use headsinks, nor a metal case...Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Stigmata Posted November 25, 2002 Author Report Share Posted November 25, 2002 The SID clock input is supplied by the PIC on all 3.Christoffer Quote Link to comment Share on other sites More sharing options...
Stigmata Posted December 2, 2002 Author Report Share Posted December 2, 2002 Can I try to cange the C1/C2 to another cap or can I destroy the 6581 chip more??(If its broken).Just recognize that the filters is there (somewere), but I have to turn the volume up so my speakers just shake!! ;).Another question:Whats the device number for?Take careChristoffer Quote Link to comment Share on other sites More sharing options...
LO Posted December 3, 2002 Report Share Posted December 3, 2002 Sorry Stigmata but this doesnt answer your question at all.......Im running the mos8580(ex C128D) with CLK connected to the PIC, so far it hasnt got hot, using 6.8nF capsI got a short piece of ribbon cable to connect to the PICdont know if this makes any difference???Has any1 had overheating probs when using the 1mhz OSC instead of the PIC pin?And has any 1 found a 1mhz OSC in NZ or Australia?? Quote Link to comment Share on other sites More sharing options...
TK. Posted December 4, 2002 Report Share Posted December 4, 2002 Can I try to cange the C1/C2 to another cap or can I destroy the 6581 chip more??(If its broken).you can try it without any risk. Note that capacitances are added when they are connected in parallel. That means: you can leave the 470 pF caps on the board and solder other caps in parallel - e.g. two additional 1nF will result into 2* 1.47 nF Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
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