LaRssA Posted February 9, 2008 Report Share Posted February 9, 2008 Hi!I was minding my own business the other day, when I saw that my PSU for my external LaCie HDD had a plug with 4 pins. Turns out it delivers 12V and 5V (2A on each, so that's enough..)Anyway, these PSU's are available online for $20 (see link)http://www.lacie.com/products/product.htm?pid=10735So I was wondering if they could be a good alternative to the original C64 PSU?I'm probably going to just use 6582's or 8580's in the second MB-6582 I'm building, so if anyone could confirm this and help me with the internal PSU for the MB-6582 (Wilba?) to make it work, I'd be happy to try it out!Might also be a great PSU for future 6582 builders!The size is like a normal laptop-PSU, so it would be pretty neat!Will probably last a lot longer then the C64 one too.The plug could of course be changed to a 7-pin DIN (I could get one at a local store since I allready have the 7-pin PCB mount plug) - or something else.Any thoughts? :) Quote Link to comment Share on other sites More sharing options...
Wilba Posted February 9, 2008 Report Share Posted February 9, 2008 I can help you with that ;)It should be fairly easy to connect it via the 7-pin DIN socket and make a few changes to the PCB, so that you connect the 12V DC to where the 9V AC would normally go, so it goes through V1 (a 7809)... then depending on whether the 5V DC is regulated or not, it could connect directly to the 5V supply or be routed through an 7805.You'll have to check whether the 5V output is regulated or not. I'm assuming it is because it looks like a switch mode power supply, which could be noisy, I don't know. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted February 10, 2008 Report Share Posted February 10, 2008 Yeh my money's on noisey switchmode... I'm sure you could filter it out somehow but would it be worth it? Quote Link to comment Share on other sites More sharing options...
nILS Posted February 10, 2008 Report Share Posted February 10, 2008 If you really wanna go switching PSU - you could at least do so really cheap:http://www.pollin.de/shop/detail.php?pg=NQ==&a=NTc2OTQ2OTk= ;)edit: evil typo Quote Link to comment Share on other sites More sharing options...
LaRssA Posted February 10, 2008 Author Report Share Posted February 10, 2008 good point, nILS... I'll check it out some more and come back to you :-) Quote Link to comment Share on other sites More sharing options...
pkniffer Posted February 24, 2008 Report Share Posted February 24, 2008 what happened with this? I am finding it very difficult to locate a c64/128 PS in my area... :)( Quote Link to comment Share on other sites More sharing options...
nILS Posted February 24, 2008 Report Share Posted February 24, 2008 I ordered from pollin the day before yesterday and since it's only 3€ I threw one of them into my order. I'll keep you posted once I have it. Quote Link to comment Share on other sites More sharing options...
pkniffer Posted February 24, 2008 Report Share Posted February 24, 2008 where could you find a connector for it? (female side) anywhere?and from where do they ship? Quote Link to comment Share on other sites More sharing options...
nILS Posted February 24, 2008 Report Share Posted February 24, 2008 Connector: It's a regular mini-din connector. You can always just cut it off and put the one you like best on there. They ship from Germany. Quote Link to comment Share on other sites More sharing options...
nILS Posted February 27, 2008 Report Share Posted February 27, 2008 I just got the psu from pollin and tested it with my mbSID v2. About the box:* boards: modular boards from Mike, revision 2 (the old-school-stuff) upgraded to v2 * sid used to record: 8580R5B* power: the above mentioned switch-mode psu, 5V directly into the core (w/o 7805), 12V into the sid module (with 7809)* soundcard: SBLive Player 5.1 *shudder*Results:* the first picture is a capture of the noise.* the second pic is the same part of the wave in spectral view (amplified by 15dB to make it more visible)* listen to the attached mp3 if you're not sure if that's good enough for you* I added the last screenshot to show what kind of noise I get when the cable is unplugged from the soundcard (before the yellow line sid plugged in, after the yellow line the cable is unplugged) - now you know why I said *shudder* earlierI like it :Dpsu.mp3psu.mp3 Quote Link to comment Share on other sites More sharing options...
silvrbak Posted February 29, 2008 Report Share Posted February 29, 2008 Anyone know where I can get one of these in the US? Quote Link to comment Share on other sites More sharing options...
Kartoshka Posted February 29, 2008 Report Share Posted February 29, 2008 i have some laptop/external storage drive PSUs, will check next week their power outs. I know it's 12v and 5v, standard. What's the amperage i need it to be on each of these lines? Quote Link to comment Share on other sites More sharing options...
stryd_one Posted February 29, 2008 Report Share Posted February 29, 2008 I just realised that after our long testing session in the chat none of us posted the results - that's a noisey noisey PSU. See the spikes? they're bad. Quote Link to comment Share on other sites More sharing options...
nILS Posted February 29, 2008 Report Share Posted February 29, 2008 Hihi :D Yes, it's spikey (the noise itself is from my PC, the cable etc), but not necessarily noisey (yeah, spikes *are* noise too, I know ;-)). I wouldn't recommend it for studio use or the likes, but for a cheap and easy to set up (well, there's nothing to set up really) PSU it's a good deal @ 3€. Quote Link to comment Share on other sites More sharing options...
karlos Posted February 29, 2008 Report Share Posted February 29, 2008 Hi all!Just to give my opinion, I think both prices are very atractive (i'd never see a price as low as 3€! for a PSU :o), and I'm agree that depending of the setup/application or for tests it would be a good deal..., but unexpensive switching mode PSUs have a lot of negative issues when supplying to digital...especially if the current demand is near to the supply current.Not only HF and RF noise, or spikes which could (when murphy say it ;D) fry or directly kill any IC, as the normal decoupling capacitors for linear PSU would be not capable of filter them without adding some RF decoupling components. Also, if not properly shielded, problems with electromagnetic interference could happen, by adding noise to near data lines or others... I would prefer a good classic linear PSU design, its heavier and bigger because the xfmr, but it needs few components, it is durable (correct word?), and today there are very good Low Drop Regulators, that only have 1 or 1,5V voltage drop. I've tried the 3pin regulator LD108X series (pin-to-pin compatible to 78XX), which depending of the current demand, have a drop of only 1V (compared to 3v of 78XX series) and as a result, xfmr can be little smaller, and they don't get as hot as the 78XX do, as they only "eat" 1V... here is a link to one of the series, that can give 3A: http://www.st.com/stonline/books/pdf/docs/6738.pdfhuh little long post... hope it was'nt boring... ;DBest regards,Carlos. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted February 29, 2008 Report Share Posted February 29, 2008 Good post :) I think the 78xx is chosen because it's so popular = easy to find in all parts of the world... But it's probable that there are better parts. Quote Link to comment Share on other sites More sharing options...
silvrbak Posted March 3, 2008 Report Share Posted March 3, 2008 Not much noise in the sample mp3 given. I just care how it sounds. If it works & the sound is fine I'm cool with it. Quote Link to comment Share on other sites More sharing options...
nILS Posted March 3, 2008 Report Share Posted March 3, 2008 I said this before, I just wanna make sure I get the main points across: * This PSU is dirt-cheap.* It doesn't need any modifications* It doesn't add a lot of static noise but it does crackle Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 3, 2008 Report Share Posted March 3, 2008 Not much noise ...sound is fineYou need better speakers :)As nILS said though, the idea here is a cheap alternative. Sure it puts clicks in the signal, but it's **cheap**. Perhaps filter caps could reduce the clicking though, if you feel adventurous... Quote Link to comment Share on other sites More sharing options...
/tilted/ Posted March 4, 2008 Report Share Posted March 4, 2008 Perhaps filter caps could reduce the clicking though, if you feel adventurous...Not really a good idea.Many small switchmode supplies employ regulation feedback loops that are marginally stable these supplies may fail to regulate properly or may not regulate at all if additional filtering capacitors are used at the output.Edit:See also here:http://www.midibox.org/forum/index.php/topic,10921.0/topicseen.htmlWhich links to:http://sound.westhost.com/articles/external-psu.htm Quote Link to comment Share on other sites More sharing options...
florian Posted May 3, 2012 Report Share Posted May 3, 2012 Hi at all. I am beginnig a 6582 build. I will stuff it only with 6582/9580. I only for instance have 2 6582. I don't have any psu for it. so for me it's power option A exact??? i a thinking to buy the pollin psu to begin, because i fear a fail of a c 64 psu and loose my sids. etherway i found a seller who claim to have nos c64 psu for cheap here: http://www.dataserve-retro.co.uk/contents/en-uk/d41.html what would you do instead of me?? will it be easy to source a c 64 conector for the pollin thing??? thanks!! Quote Link to comment Share on other sites More sharing options...
florian Posted May 4, 2012 Report Share Posted May 4, 2012 (edited) what did you think of this one??? seem to be a good one no??? no need for extra component?? http://cgi.ebay.fr/DC-50W-5V-5A-12V-3A-Regulated-Switching-Power-Supply-/180416851549?pt=FR_YO_MaisonJardin_Bricolage_InstallationElectrique&hash=item2a01aeae5d#ht_2773wt_1049 really need an advice , as i think i am not able to build one like orange one... thanks Edited May 4, 2012 by florian Quote Link to comment Share on other sites More sharing options...
Altitude Posted May 4, 2012 Report Share Posted May 4, 2012 (edited) That is a ridiculously too big PSU both size and power wise, you will need a case as big as the PT10 to house that thing. My MB6582 is stuffed to the gils and has backlit knobs and that draws barely 1 amp, that thing has 5A on the +5 rail alone (which draws about 150 mA on the MBSID) this was my solution: Edited May 4, 2012 by Altitude Quote Link to comment Share on other sites More sharing options...
florian Posted May 5, 2012 Report Share Posted May 5, 2012 (edited) thanks altitude! i think i will go for your solution... I will pm you for more detail later!! thanks Edited May 5, 2012 by florian Quote Link to comment Share on other sites More sharing options...
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