frailn Posted July 7, 2008 Report Share Posted July 7, 2008 After reading and rereading and rerereading this post regarding bipolar PSU for the MBFM, I did some looking around on the internet and found a bipolar psu kit from PAiA that delivers +/- 12VDC @ 300mA. It seems like this kit should work for the MBFM, but I'm unsure about the "300mA." The kit is $41. This might be a good find for FM builders in the US, if 300mA is enough for the FM. Can any FM builders confirm that this PSU kit is good for the FM?Link to the site:http://www.paia.com/proddetail.asp?prod=9770R-12 Quote Link to comment Share on other sites More sharing options...
lief138 Posted July 7, 2008 Report Share Posted July 7, 2008 if that works then this should work also.http://musicfromouterspace.com/analogsynth/WALLWARTSUPPLY/WALLWARTSUPPLY.php?? Quote Link to comment Share on other sites More sharing options...
frailn Posted July 7, 2008 Author Report Share Posted July 7, 2008 That page has a lot of good information! However, purchasing their PCB, plus shipping, then buying the parts from Mouser, Digikey, etc...plus shipping would seem to be more expensive. I like the PAiA kit because it includes everything you need, including the wall wart for $41. Shipping within the US shouldn't be bad. Quote Link to comment Share on other sites More sharing options...
frailn Posted July 7, 2008 Author Report Share Posted July 7, 2008 Okay, I answered my own question ::) - The PAiA PSU does not have enough mA to run a good FM box with LED's and Backlit LED. Off to read more on the PSU PCB at Music from Outerspace.EDIT: I'm wrong on this - see below Quote Link to comment Share on other sites More sharing options...
lief138 Posted July 8, 2008 Report Share Posted July 8, 2008 btw for giggles I just put all those parts to fully stuff that MFOS PS into the mouser cart. Including the wall wart came to approx 30 shipped. Its not so bad Quote Link to comment Share on other sites More sharing options...
frailn Posted July 8, 2008 Author Report Share Posted July 8, 2008 Okay, so I just found this schematic, which tells me that the PAiA kit works. I was wrong! I should do more reading and less posting! BTW, that's not too bad for the mouser parts. I think I'm going for PAiA kit, and just get it all in one bag. It comes out just a little cheaper than MFOS board + Mouser order, not much, though. So others could go either way. Thanks for looking that up on Mouser, lief! Quote Link to comment Share on other sites More sharing options...
NV Posted July 8, 2008 Report Share Posted July 8, 2008 300mA should be plenty to supply the OPL3 board alone; the OPL3 really only needs less than 100mA on average, as you've seen from Thorsten's schematic. The rest of the MBFM is powered by the 5V supply in the CORE board, so as long as you're supplying enough power for the 5V then the bipolar PAiA supply should integrate well enough for most everyone's uses. The only reason you may need more is if you chose to utilize an additional bipolar AOUT, but even then the extra 200mA should very well prove sufficient to drive it.One concern would be that the kit utilizes a wallwart transformer, which is only really an issue if you want to keep things a bit neater from the outside and avoid having two separate plugs for the MBFM. However I imagine that most people utilizing this kit won't be interested in AOUT options, fiddling with transformers, or concerned about additional plugs, so for those purposes it should certainly get the job done in one clean shot. Quote Link to comment Share on other sites More sharing options...
asafnetzer Posted July 12, 2008 Report Share Posted July 12, 2008 fralin, If you have enough free space in the case, check thishttp://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=439Best regards,Asaf Quote Link to comment Share on other sites More sharing options...
stryd_one Posted July 12, 2008 Report Share Posted July 12, 2008 Hey $15 bucks for a ready-to-go +/-12V regulated PSU, that's awesome! Quote Link to comment Share on other sites More sharing options...
frailn Posted July 13, 2008 Author Report Share Posted July 13, 2008 :D Perfect! Thanks for the link! Quote Link to comment Share on other sites More sharing options...
buhler Posted September 21, 2008 Report Share Posted September 21, 2008 heya fräulein, did you ever get around to buying one of those Condor PSU's? i've got a MBFM waiting for a psu... just curious if it worked out or not. ;)(anyone can answer, not just fräulein.) Quote Link to comment Share on other sites More sharing options...
frailn Posted September 22, 2008 Author Report Share Posted September 22, 2008 I did buy one of those PSU's. But, I have not started on the MBFM, yet. It's collecting dust along with the two old sound cards I purchased on eBay that have the relevant MBFM chips. I'm going to tackle the MB6582 and Lemonhorse's AY-3-8912 before I work on the MBFM....saving the hardest one for last.If you have any questions about the PSU, I can dig it out and try to answer them or even take photos and post them here. Quote Link to comment Share on other sites More sharing options...
buhler Posted September 22, 2008 Report Share Posted September 22, 2008 I did buy one of those PSU's. But, I have not started on the MBFM, yet. It's collecting dust along with the two old sound cards I purchased on eBay that have the relevant MBFM chips. I'm going to tackle the MB6582 and Lemonhorse's AY-3-8912 before I work on the MBFM....saving the hardest one for last.If you have any questions about the PSU, I can dig it out and try to answer them or even take photos and post them here.no need for pics. ;D i just wanted to know if you had actually purchase one, you know, to see if they were reliable/worth the effort. thanks for the reply! :D Quote Link to comment Share on other sites More sharing options...
reboot Posted September 23, 2008 Report Share Posted September 23, 2008 just for information...from..http://www.paia.com/proddetail.asp?prod=K83it works great with another project i made ...just to add 5v Quote Link to comment Share on other sites More sharing options...
guiseppi Posted October 1, 2008 Report Share Posted October 1, 2008 To move from the bipolar power supply itself to the transformer (I made a bipolar from a 7812 and 7912 pretty much lifted from the PDF datasheets, but with more input capacitance)....When I made valve amps in the past, the transformers always put most projects out of range.I've hand wound 3 High Voltage and Heater toroid valve mains transformers which have run without hitch for years. This means removing all the secondary windings then adding your own. For these kind of voltages, you're talking about hundreds, if not closer to a thousand+ coils ;) It's worth it! They make great PSUs.I've actually wound a toroid especially for the MBFM already, here's a poor picture:I modified the 5.8v~ winding up to 9+v~ for the 5v, but the other winding is fine.Should be enough for the low current draw. Already tested the +/- 12v circuit. Oh. You may notice I have no centre taps on the secondaries? No problem. There is a voltage doubler in the +/- 12v circuit, so 12.8v~ is fine and actually produces roughly +/- 18v DC.I haven't managed to rewind a laminated transformer yet without problems, so I don't recommend doing this with the ordinary laminated transformers, just toroids.To do this, you need to make a long shuttle, about 8-12" long, narrow enough to fit through the centre of the toroid. Like the shuttles in weaving. I used thin mdf and pine. Wind on an overestimate of the wire to this first and wind away. Coated copper wire of course.If you choose a toroid with a suitable winding on it already, you'll need less additional windings ::)Generally, I've found toroids with higher voltage secondaries need less windings per volt. (easier on you)To measure the windings per volt, wind on 10 turns and measure the AC volts.This also tells you the rough primary windings..Make sure your wire is rated above the approximate current draw of the circuit it is to power and double that to be safe. Within reason.It may sound like a real PITA, but it only takes about an hour or two to do once you've done one and they work a treat. Quote Link to comment Share on other sites More sharing options...
Echopraxia Posted November 13, 2008 Report Share Posted November 13, 2008 Did any one purchase a few of those $15 12v PS from here?http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=439Out of stock.I was hoping to start my MBFM sometime soon. If any one has an extra one in the US they would be willing to sell please PM me. Thanks. Quote Link to comment Share on other sites More sharing options...
amp1ron Posted November 13, 2008 Report Share Posted November 13, 2008 Did any one purchase a few of those $15 12v PS from here?http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=439Out of stock.It looks like they've got almost the same thing (same specs, different manufacturer, doesn't have remote sensing terminals) for US$0.05 cheaper with screw terminal outputs:http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=1100Datasheet at:http://www.solaheviduty.com/products/powersupplies/pdfs/manuals/sl/sld12-1010-12tmanual.pdf Quote Link to comment Share on other sites More sharing options...
Echopraxia Posted January 18, 2009 Report Share Posted January 18, 2009 Another question.Can this +12v/-12v power supply http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=1100 also supply the 5v for the core aswell? I just want know if its even possible DIY style as I would like to have only one power cord to plug in when I get this thing built.Regards echo Quote Link to comment Share on other sites More sharing options...
robert lowell Posted March 25, 2009 Report Share Posted March 25, 2009 I found this at my local electronics store for $19.95. Velleman Symmetric 1A Power Supply (K8042) 20-Watt Power Supplyhttp://www.velleman.be/ot/en/product/view/?id=353668 Quote Link to comment Share on other sites More sharing options...
Echopraxia Posted April 22, 2009 Report Share Posted April 22, 2009 How about this one?http://www.futurlec.com/Mini_Power_Dual_12V.shtmlIt says on the pcb +5 and -5 aswell only $10I think you have to still get a 14VDC wall wart correct? (to do it the easy way that is) Quote Link to comment Share on other sites More sharing options...
fluke Posted April 22, 2009 Report Share Posted April 22, 2009 How about this one?http://www.futurlec.com/Mini_Power_Dual_12V.shtmlIt says on the pcb +5 and -5 aswell That's a switch mode power supply, so it will be noisy. The one you posted is a +/-12V supply only, they also sell a +/-5V version which uses the same PCB, just different regulator chips, hence the confusion. Quote Link to comment Share on other sites More sharing options...
Echopraxia Posted April 22, 2009 Report Share Posted April 22, 2009 Noisy as in noisy audio signal or a noisy power brick? Quote Link to comment Share on other sites More sharing options...
fluke Posted April 22, 2009 Report Share Posted April 22, 2009 Noisy as in noisy audio signal or a noisy power brick?The power supply will be noisy, leading to some noise on the audio signal. How much noise depends on the power supply filters, ripple rejection of the opamps, switching frequency (52kHz in this case), etc, etc. Quote Link to comment Share on other sites More sharing options...
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