LenweTasasartir Posted March 3, 2008 Report Share Posted March 3, 2008 Hi all!I'm going to build midibox sid with one core (but I'm waiting for PIC from Thailand...) and two SID 8580 (one cannibalised, and one... bought! I've found some non-used C64 chips in Poland ;)) powered by C64 PSU.Becouse I'll use two same sids, I'm going to use only +5 and +9 voltages.I've built supply from one of pdfs, but it delivers +14 (13,58 at mine), instead of +9.So...1) I've changed connection from +5 to GND, but it gave about 8.5V.2) Reconnected to +5 and added another 7809 between +14 and GND - I've still 8,7!So I ask - what's going one?Is it some problem with supply or with my (very cheap!) multimeter? Quote Link to comment Share on other sites More sharing options...
nILS Posted March 3, 2008 Report Share Posted March 3, 2008 Okay, your questions are a bit confusing, but I'll try to answer them ;-)I've found some non-used C64 chips in Poland ;))?! I seriously doubt that there's any unused 8580s. If that's really the case - does this source have any more or did you buy 'em all and what's the price tag?Becouse I'll use two same sids, I'm going to use only +5 and +9 voltages.Correct.I've built supply from one of pdfs, but it delivers +14 (13,58 at mine), instead of +9.So...Which is exactly what it is supposed to do...1) I've changed connection from +5 to GND, but it gave about 8.5V.Don't.2) Reconnected to +5 and added another 7809 between +14 and GND - I've still 8,7!So I ask - what's going one?Okay. Um, the 14.x Volts you get out of the PSU are correct and exactly what you want. The SID board has a 7809 on it which regulates that voltage down to 9V. So just feed the 14V into the SID and you'll be fine.Is it some problem with supply or with my (very cheap!) multimeter?Everything's fine I guess ;) Quote Link to comment Share on other sites More sharing options...
LenweTasasartir Posted March 3, 2008 Author Report Share Posted March 3, 2008 This guy is collecting 8-bit computers and bought some SIDsin "ancient times", but sold only this one. :( Sorry, I've tried to change his mind.Becouse I don't know how to make PCBs, I'm trying to fit it on universal boards, and I've needed to move voltage regulators to supply.EDIT:I had feeling, that magic word "universal" will kill discusion ;) Quote Link to comment Share on other sites More sharing options...
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