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numbernone
Joined: Aug 16, 2006 Posts: 477 Location: new york city
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Posted: Tue Oct 10, 2006 8:33 am Post subject:
PSU suggestions for MFOS modules |
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After a very busy weekend 10 of 12 MFOS boards are complete, maybe 2 more weeks for making panels and finishing the wiring, I am hoping in the mean time to figure how to power the thing. I was considering using a blacet supply and distribution boards, but then why suck up the extra power if the MFOS can work at 12v?? Any suggestions for a nice PSU and distribution system? |
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Coriolis
Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark
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Posted: Tue Oct 10, 2006 9:27 am Post subject:
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Howsabout Ray's own psu?
http://www.musicfromouterspace.com/analogsynth/powersupply.html
...make your own distribution scheme...?
I am working on my own 15V psu using adjustable regs 317/337's, so that could be adapted for 12V as well. I'm not as fast a builder as you though, but eventually I'll do a schem and a pcb layout for it.
Will post here when I do.
C |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Wed Oct 11, 2006 5:43 am Post subject:
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what about a power one PSU? Mouser Nr. "597-AA15-0.8". you can decide to use either +/-12 or +/-15V. it will power approx. 15 modules, i think.
http://www.mouser.com/search/ProductDetail.aspx?R=597-AA15-0.8
you can easily build your own distribution board by yourself using a strip board - everything is just in parallel...
cheers,
matthias |
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numbernone
Joined: Aug 16, 2006 Posts: 477 Location: new york city
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Posted: Wed Oct 11, 2006 7:47 am Post subject:
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Thanks for the suggestions.
Gotta love Mouser... I got a back order delivery from them yesterday...
2 RESISTORS!!!!
and today I will get...2 TRIMMERS!!!
over 8 bucks in UPS shipping for free...they are the best!! |
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Coriolis
Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark
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Posted: Wed Oct 11, 2006 12:02 pm Post subject:
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Hmm, I actually thought those Power One's cost more. But then, there are several different models. Lotsa people seem to prefer these over homemade supplies, but at 40-50, even 100$, what have they got that I can't DIY a lot cheaper? Are they that much more stable and well regulated? Seems hard to believe for the price...
I'm just wondering out loud here.
C |
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numbernone
Joined: Aug 16, 2006 Posts: 477 Location: new york city
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Posted: Wed Oct 11, 2006 1:22 pm Post subject:
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Well this is my first serious DIY project, and i am going to opt for a prefab PSU. I dont mind paying the extra $$ at all and I want to know from the moment go that the PSU is functioning as it is meant to. I think it will make the troublshooting process all that much easier to eliminate the PSU. For the next rack of CGS maybe I will try my own. I guess I shouldnt be such a wimp about mains power as I rewire lamps and other gizmos constantly at my job but for all my precious hours of work I want confidence in the supply. |
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Coriolis
Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark
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Posted: Wed Oct 11, 2006 1:36 pm Post subject:
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Hey, I can understand people who wan't to concentrate on building actual modules - I'm just wondering what's inside a psu that sells for 50$, and if it's really so much better than anything I can build as cheap, or cheaper.
Is it just a regular linear psu, or is it smps? Does it use special regulators, expensive caps/diodes/doodads or somesuch?
C |
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numbernone
Joined: Aug 16, 2006 Posts: 477 Location: new york city
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Posted: Wed Oct 11, 2006 1:46 pm Post subject:
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I reckon it just comes down to paying for someone to provide a service. Look how much a Serge panel costs, or even a MOTM KIT. A bloody ton of moolah, and they are populated with the same stuff we are sticking in our DIY projects ( I think). Tho I am not using any pricey Bourns pots or the like. While we are on the subject of costs and such... WHO THE HELL CAN AFFORD TO USE FRONT PANEL EXPRESS. By god they are expensive!!! Like $250 bucks for a soundlab panel...you gotta be kidding!!!! Thats why I made my panel from a piece of masonite out of a dumpster, with handpainted face. It sure dont look like a Moog, but it definitely looks like MINE!!!
Cheers to all. |
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Scott Stites
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Wed Oct 11, 2006 4:48 pm Post subject:
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Quote: | It sure dont look like a Moog, but it definitely looks like MINE |
What do you see when you turn out the light?
I normally don't build power supplies for the simple fact that lethal voltage/current makes me skittery. I'll build from a kit, but that's as far as it goes.
Cheers,
Scott |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Wed Oct 11, 2006 6:34 pm Post subject:
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i did alot of research before i built my power supply, there's not much to it really [well, there is and there isn't, that is]. a good schematic for one is thomas henry's "platinum power supply" which apparently was published in a Nuts & Volts. there is some good reading material on rectification and ripple and whatnot at jim patchell's site. i got a book with all them useful formulas in it too.
i basically salvaged all the parts i used, so i built it for very little, but even buying all parts new it wouldnt have cost more than 15$ orso.
i made a PCB layout for it if anyones interested. one version has +/- whatever plus a +5 or whatevr, the other one is just a bipolar.
josh |
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Wed Oct 11, 2006 10:56 pm Post subject:
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numbernone wrote: | WHO THE HELL CAN AFFORD TO USE FRONT PANEL EXPRESS. By god they are expensive!!! Like $250 bucks for a soundlab panel...you gotta be kidding!!!! |
i can afford this, and i love the panels! i let them made my SL front panel and it cost about 70 EURO's (about 100$). http://modular.fonik.de/soundlab/soundlab.fpd
the average price for my eurorack modular panels is about 23 EURO's (about 30$) and it's worth it.
there're some ways to reduce the price:
(1) colored engraving is expensive so i chose black anodized panels. then there's no need to color the engraving...
(2) all kind of graphics is expensive. it's much cheaper to import hpgl graphics for this kind of stuff (dials etc.)...
(3) you pay for every item, so reduce the count of items by using ONE text object with multiple lines for text in columns....
you may take a look on some examples:
http://modular.fonik.de/fpd/MFOS_12dbvcf.fpd
http://www.modular.fonik.de
cheers,
matthias |
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numbernone
Joined: Aug 16, 2006 Posts: 477 Location: new york city
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Posted: Thu Oct 12, 2006 7:11 am Post subject:
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Hmm... not a bad price. So yours was the waterproof one??? Hands down the nicest SL I have seen. Perhaps I will redo some of my layouts and see what the price comes too. |
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Wild Zebra
Joined: Apr 28, 2005 Posts: 806 Location: Ohio
Audio files: 5
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Posted: Thu Oct 12, 2006 8:58 am Post subject:
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I'm right with you, Scott and numbernone, I'm a first timer on the PSU so I'm following this thread. I don't wanna make one the first time, maybe a kit. What about these http://www.paia.com/fracrak.htm I thought about ordering the +/- 12 for starters and maybe even a fracrack. I have five modules about to be finished!! _________________ "your stripes are killer bro" |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
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Posted: Thu Oct 12, 2006 6:00 pm Post subject:
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hey zebra
those regulated paia PSUs ain't too fantastic looking as a kit at 300/200 mA.. plus they are half-wave rectified it looks like. in my opinion if your going to spend 35$ plus on one, getcha a good one at at least 1A to power all your current plans plus future ones. |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Thu Oct 12, 2006 6:34 pm Post subject:
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designing and building a power supply is not that hard... designing and building a really good supply (stable, clean, low-ripple) is an art form. a noisy supply will sabotage all the care and expense you put into the modules themselves, this is one place where i don't skimp. had fantastic luck w/ power one supplies, they're pretty easy to find surplus or on ebay; even retail they're a good deal. if you open up a serge power supply, guess what you'll find....
bbob |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Thu Oct 12, 2006 7:27 pm Post subject:
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Quote: | I normally don't build power supplies for the simple fact that lethal voltage/current makes me skittery. I'll build from a kit, but that's as far as it goes.
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yeah always super careful when working around exposed mains, never do it while drinkin', don't be a path to return, etc etc.
recently i did a repair on my oscilloscope's CRT grid-bias circuitry [1800V].. i did not discharge the HV caps first and i can tell you it was the most aware of what i was doing i have been in a while... eeeeeeeeeeeehehehehhhhhhhhh |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Thu Oct 12, 2006 10:44 pm Post subject:
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Quote: | if you open up a serge power supply, guess what you'll find....
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Quote: | in my opinion if your going to spend 35$ plus on one, getcha a good one at at least 1A to power all your current plans plus future ones |
it's more fun to me to build an module that sounds or changes the sound, something to play with... and 35$ or more for a kit? than power one PSUs are a good deal, i think.
cheers,
matthias |
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Wild Zebra
Joined: Apr 28, 2005 Posts: 806 Location: Ohio
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Posted: Fri Oct 13, 2006 7:37 am Post subject:
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Hey thanks for the info on the paia stuff. I reckon I might order the Mouser one above unless anyone has any other suggestions? I'll look on ebay as well. I reread the post any good places to find them surplus? _________________ "your stripes are killer bro" |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Fri Oct 13, 2006 9:40 am Post subject:
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The thing which costs the most in a DIY PSU is the transformer itself. A nice 18-0-18 @ 4A torroidal like the one I'm putting in the Sorcerer will set you back about AU$50, unless you're lucky enough to find something similar on chuck out day. Next would be the caps, the main electrolytic ripple filters, 2 of those will add another AU$10.
The main points to remember are; -
1. Work from a trusted schematic unless you know the maths behind it.
2. All exposed metal work must be earthed.
3. No drugs or alchohol until it's tested.
4. Build it as if it's a bomb! (ie very carefully)
I'll spare you all the stories of the 5 times I've bitten by the 240V AC power python. Let's just say it's an experience everyone can do without! _________________ What makes a space ours, is what we put there, and what we do there. |
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State Machine
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Joined: Apr 17, 2006 Posts: 2809 Location: New York
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
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Posted: Fri Oct 13, 2006 1:36 pm Post subject:
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Uncle Krunkus wrote: |
I'll spare you all the stories of the 5 times I've bitten by the 240V AC power python. Let's just say it's an experience everyone can do without! |
Not meant to discomfort, and it's certainly less lethal than 240 V, but I can assure you that with 36 Volts at 4A one can have some really nice fireworks as well _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
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Posted: Fri Oct 13, 2006 4:56 pm Post subject:
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Yes, very true.
I forgot to say that I haven't had any "incidents" with electrocution since my early 20s. I just have way too much respect for it these days to even come close. Also, the older you get the higher the chance that your heart would spit the dummy. _________________ What makes a space ours, is what we put there, and what we do there. |
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State Machine
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Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sun Oct 15, 2006 8:04 pm Post subject:
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Quote: | Also, the older you get the higher the chance that your heart would spit the dummy. |
LMAO !!!!!!!!! That is some classic line there! I love these international forums ! So much to learn!
Bill |
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