which power supply project

[bigchasbroon]

can anyone reccomend a power supply project. the one on tonepad and the ggg ultra clean seem likely candidates i am supply about 8 pedals but that grows all the time due to you lot here  they are all 9v except for one at 18v so id like to have an 18v output in the same enclosure.

[koen]

If you're going to build one, I recommend building one with isolated outputs, to eliminate hum. Good examples are the Spyder (http://www.geofex.com/Article_Folders/Spyder/Spyder.htm) and the four isolated output from GGG (http://www.generalguitargadgets.com/index.php?option=content&task=view&id=23&Itemid=50). Good luck!

[petemoore]

  Constant DC [ripple-free] is what your pedals like best.
  Some pedals are super particular about their power [Echo Park, others I'm sure], and don't like this or that power supply for some reason, it is hit or miss...don't trust...the owners manuals misled me, but I got lucky and this second EP decided [for reasons unknown to the first EP] to like the VDLabs PPII supply...works fine now.
  Lifting the grounds is a somewhat hefty task or requires batteries, good to get that out of the way if ground loop hum is, and bothersome.
  For floating supplies, the Spyder or a commercial unit.
  Otherwise for daisy chained power, the OneSpot's 9vdc, lotsa current is a good one.
  Depends on the room, lighting, the pedal, and the other pedals, and the amp, and...sometimes the common ground deal doesn't throw too much of a loop hum in there.
  Many a floating supply seems to be as good as using batteries.

[DUY1337GUITAR]

Have you seen this page before?
http://diy-fever.com/index.php?project=power_box

Just some good info to check on.  You really don't have to have a transformer in your supply to directly transform all the AC into your preferred DC voltage.  You can just have one of those AC wall plugs to connect to your power supply and have voltage regulators with necessary filtering.

Here's what I'd do (you don't have to do the same):
Since you also want 18V, and voltage regulators need about 3+ more volts in order to work correctly, you could use a 24VDC AC adapter (with a decent amount of amps) as your power supply FOR the power supply (diodes/bridge-rectifiers shouldn't be needed since the adapter produces DC, I believe).  Then you can have an 18V voltage regulator (7818) to bring down the 24V input to 18V.  The 18V can be wired to a DC output jack, and then you can bring down the 18V to 9V with a 9V voltage regulator (7809) and wire that to jacks, too.  Then you would have two voltage sources.  The reason why you should use the 9V regulator in front of the 18V regulator instead of the 24V input is because you don't want it to get, too hot.  Capacitors should be placed where necessary to remove ripples and noise as shown from that link I gave at the top of my post.

Hope you have fun making this thing, cheers!

[G. Hoffman]

Have you seen this page before?
http://diy-fever.com/index.php?project=power_box

Just some good info to check on.  You really don't have to have a transformer in your supply to directly transform all the AC into your preferred DC voltage.  You can just have one of those AC wall plugs to connect to your power supply and have voltage regulators with necessary filtering.

Here's what I'd do (you don't have to do the same):
Since you also want 18V, and voltage regulators need about 3+ more volts in order to work correctly, you could use a 24VDC AC adapter (with a decent amount of amps) as your power supply FOR the power supply (diodes/bridge-rectifiers shouldn't be needed since the adapter produces DC, I believe).  Then you can have an 18V voltage regulator (7818) to bring down the 24V input to 18V.  The 18V can be wired to a DC output jack, and then you can bring down the 18V to 9V with a 9V voltage regulator (7809) and wire that to jacks, too.  Then you would have two voltage sources.  The reason why you should use the 9V regulator in front of the 18V regulator instead of the 24V input is because you don't want it to get, too hot.  Capacitors should be placed where necessary to remove ripples and noise as shown from that link I gave at the top of my post.

Hope you have fun making this thing, cheers!

You could do that, except that doesn't isolate the outputs, which is quite valuable.  It will work much of the time, until you get to that one bar that has you on the same circuit as the beer cooler and the neon.  Then you are unplugging things one at a time trying to find the problem, and ripping your hair out.  And of course, it wasn't a problem during sound check, because during sound check they didn't have the neon turned on!!!! 

I'm very much in favor of getting a that Weber transformer, and using it to build the Spyder on Geofex.  Isolated power supplies just give me a sense of confidence and ease that I like.  And it's cheaper than batteries!

And yes, I know that daisy chaining pedals works well for a lot of people.  I've just spent too many years as a sound guy watching people who have never had a problem before all of a sudden develop one, and because they aren't used to the situation they don't know how to find the problem, much less how to fix it.  Then all of a sudden, my 30 minute sound check is taken up fixing someone else's system when I could be making the band sound good.  Well, better, at any rate.  Usually, they end up buying a box of Duracell Procells from my tech kit, and that ain't cheap!  (I probably shouldn't complain, since I make money off of it!)

I'm not bitter.  Not really.  I just sound like I am.  Really I'm quite sweet.  Well, I try to be.


Gabriel

[petemoore]

  A Spyder appeared, the noise disappeared, and didn't return.

[bigchasbroon]

OK thanks a lot Gents.
The Spyder seems to be the way to go. the weber transformer is currently out of stock but I can get started on the rest.

[koen]

Weber has a new, similar transformer, and even a kit for it: https://taweber.powweb.com/store/modkits.htm#eps

edit: My only concern with these Weber trannies is that they are big, and would need a large enclosure that may not fit underneath a pedalboard, such as the PedalTrain.