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Laurie
Double Platinum Member
Canada
4854 Posts |
 Posted - 01/05/2009 : 02:10:44
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My avatar is the artwork (in false colour) for my 9VDC power supply. The actual avatar is for the previous version of the circuit board - the bridge rectifier is turned 90 degrees in the physical one shown below.
It takes 12V to 18V (AC or DC) at about one amp and gives 9VDC regulated output with 10 star-connected output leads. Enough to power 10 of the thirstiest pedals.
To power it, I can usually find a 12VAC at 1 Amp "wall wart" at the local thrift store for about $1.
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Edited by - Laurie on 01/05/2009 02:14:05 |
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DeFrag
Moderator
USA
3409 Posts |
Posted - 01/05/2009 : 03:40:49
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That's great Laurie. So in a star configuration the outputs are not isolated from each other eh?
I've searched high & low for a power supply to feed my analog MoogerFoogers to no avail including the Voodoo PedalPower, JuiceBox, Diago, Burky Six Flatliner, Dunlop Brick, et al. The Moogers are really susceptible to noise with common-ground daisy-chained power & thus require isolated lines. Nare a unit provides exactly what I need. The FlatLiner comes the closest with 200mA * 6 but I need 2 isolated outputs at 240mA & 300mA respectively.
The exact current requirements are as follows:
MF-101 Filter 100mA
MF-102 Ringmod 100mA
MF-103 Phaser 100mA
MF-104 Delay 300mA
MF-105 MuRF 240mA
MF-107 FreqBox 200mA
for a total of 1040mA (nominal).
Are you aware of any available units that can provide for my needs or would we be able to design one?
Tks mate. Again, your supply looks excellent.  |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 01/05/2009 : 03:58:39
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In star, all grounds are tied together - but at one common point (inside the power supply) which avoids the crap that passes down the line in daisy-chain configuration.
All are at 9VDC?
Assuming it is 9V... There is a way to do this - can you make PCBs? I have a transformer that has eight (8) isolated AC output windings at 300mA each. Just need to wire up each of them to one of the power boards in my supply above - one transformer and 6 (or 8 if you like) boards in one box.
I could do it as a one-off for you, but this stuff takes SOOOO much time there's a lot of beer money involved 
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Edited by - Laurie on 01/05/2009 04:02:00 |
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DeFrag
Moderator
USA
3409 Posts |
Posted - 01/05/2009 : 04:25:11
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quote:
Originally posted by Laurie
In star, all grounds are tied together - but at one common point (inside the power supply) which avoids the crap that passes down the line in daisy-chain configuration.
All are at 9VDC?
Assuming it is 9V... There is a way to do this - can you make PCBs? I have a transformer that has eight (8) isolated AC output windings at 300mA each. Just need to wire up each of them to one of the power boards in my supply above - one transformer and 6 (or 8 if you like) boards in one box.
I could do it as a one-off for you, but this stuff takes SOOOO much time there's a lot of beer money involved
OIC about the star grounds now, tks. Still not technically isolated though right? Yeah, the MFs are 9V but positive center unlike Boss. How large is that transformer with 8*300mA outs.. or what size enclosure would be req'd? It sounds good.
Right now of course I'm living with the 6 individual supplies that came with each MF & its alright I suppose since they all sit on one Furman block. I've just always wanted to free up some outlets. No rush bud, I may hit you up again someday.. just wanted to know it could be done.
Beer money is no object as long as you'd promise not to blow it on PBR, Hamms, or Bud!  Tks for the reply.. you've been electronically busy! |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 01/05/2009 : 04:57:17
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PBR is the cheapest keg available from our gov't-run liquor board..  Here, nary a bottle or can to be seen.
Laurie: looks very nice!! |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 01/05/2009 : 05:00:48
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quote:
Originally posted by DeFrag
Still not technically isolated though right?
That's correct - not isolated in any way at all. It is just a technique to get the most out of a common ground system.
quote:
Originally posted by DeFrag
Yeah, the MFs are 9V but positive center unlike Boss. How large is that transformer with 8*300mA outs.. or what size enclosure would be req'd? It sounds good.
With a bit of fiddling, the whole thing might fit into this box: http://www.smallbearelec.com/Detail.bok?no=567
It would definitely work. Just have to put it all together.
quote:
Originally posted by DeFrag
Beer money is no object as long as you'd promise not to blow it on PBR, Hamms, or Bud!
So... let's do it 
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 01/05/2009 : 08:07:53
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Hi Laurie & Guys
That's a very compact & nice design.
I was wondering how warm the case might get under 50% to 75% loading?
Although you probably don't even make it to 500mA (50%) loading.
I guess that the case being "Black" helps a lot, with the heat dissipation.
And seeing no-one has asked yet, when did you get the collection of right-angle molded 2.1mm connectors?
And don't tell me you pulled 10 PSA adapters apart for the flying leads...
Once again nice design.
Regards Dr. Bob  |
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Disco Stu
Silver Member
USA
303 Posts |
Posted - 01/05/2009 : 09:25:59
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I still say your avatar looks like a dinosaur! And all this electronic engineering is way over my head... like trying to explain the Hegelian Dielectric to a Raccoon.
But that sure is a pretty-looking little power supply! And i'm sure you don't dabble with PBR up there; maybe OV. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 01/05/2009 : 14:41:39
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quote:
Originally posted by Dr. Bob
Hi Laurie & Guys
That's a very compact & nice design.
I was wondering how warm the case might get under 50% to 75% loading?
Although you probably don't even make it to 500mA (50%) loading.
I guess that the case being "Black" helps a lot, with the heat dissipation.
And seeing no-one has asked yet, when did you get the collection of right-angle molded 2.1mm connectors?
And don't tell me you pulled 10 PSA adapters apart for the flying leads...
Once again nice design.
Regards Dr. Bob
Thanks Dr. Bob!
The case will dissipate a few Watts (maybe 5 or 6 to my eye) - and I'm also sure I've never got to more than 500mA. Certainly, it never gets more than fractionally warmer.
The 2.1mm leads are straight from the electronics store They are the most expensive part of the whole thing! (about $1.80 each)
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DeFrag
Moderator
USA
3409 Posts |
Posted - 01/06/2009 : 09:51:32
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quote:
Originally posted by Laurie
So... let's do it
Thanks for your ambition & willingness Laurie. I appreciate it more than you know.
I have a couple other projects pending that I'm sure I'll need some guidance from you on first though. Even though my minor in college was electronics, I still have never actually designed active circuits. However, I can modify certain simplistic designs.
I bought my son the BYOC SG-2 clone that came with the free booster kit w/o a case. I've already got the circuit mods to add an LED, power-jack, stomp switch, & external pot to replace the internal trim-pot in order to turn it into a nice boost pedal. The thing is, I'd like to actually have a single pot "boost" above 12:00 & "cut" below 12:00 & am not quite sure how to go about it. I'd bet I'll lose some resolution but not range. Additionally, I may stick it in a larger Hammond case with extra room for jacks to incorporate either an A/B or A/B/Y capability so he'll have a nice multifunction pedal at his disposal.
Here is my own design for the bABY Passive Switchbox. I worked it over quite a bit.. let me know what you think about it.
Second, I've got to run through the build of the SG-2 with my son, teaching him about components, soldering, etc. I really wish that BYOC had the VB-2 clone available as I'd love to put both into a single enclosure. Is there another DIY vibrato out there which I am not aware? Otherwise, I guess we'll just stick the SG-2 in a single unless you think there's another effect that would fit nice along side the vibrato in a single enclosure.
Right now, I'm working with a guy down in AZ spec'n out a custom ribbon controller that includes (his) new pressure-sensitive design for CV filter control in addition to the normal CV pitch. We've yet to discuss the envelope triggers. |
Edited by - DeFrag on 01/06/2009 09:52:03 |
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In case you were interested in my avatar...
