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Topic: MXR Resonator power requirement? |
John McClung
From:
Olympia WA, USA
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Posted 10 Jul 2018 11:54 pm |
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I'm working up a new pedal board and would like to include a power supply to power all effects. My MXR Resonator's power supply wall wart is specced at 18v/1.0A.
1.0A-10000mA, right?
I haven't found a power brick that has an outlet specced that high.
Will it work with an 18v/300mA supply? That's about as high as bricks seem to go.
Thanks for advice, gang!
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 11 Jul 2018 12:58 am
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| The info I have found indicates that the MXR resonator draws only 18mA at 18VDC. A supply that provides 300mA/18VDC is more than large enough for supplying at least a dozen of those, so a smaller 18VDC supply would do fine. |
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Jon Light
From:
Saugerties, NY
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Posted 11 Jul 2018 3:05 am
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High-draw digital devices on your board (such as fancy delays etc) will eat up a lot of that capacity but 300mA will power lots of non-digital boxes on a board, no sweat.
A casual study of the site below can give you a good general overview of the sorts of average current draws of various types of devices. With the objective of staying well clear of maximum ratings of the power supply, you can figure where you stand.
http://stinkfoot.se/power-list |
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Jack Stanton
From:
Somewhere in the swamps of Jersey
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Posted 11 Jul 2018 3:31 am
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John,
Tutone makes a adapter it takes a single 9 V output and doubles it to 18. Brilliant idea.
Fire from the true tone website, cheaper than Sweet water or any of the other sites and free shipping |
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Morton Kellas
From:
Chazy, NY, USA 1
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Posted 11 Jul 2018 5:57 am
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| John, I have the Truetone 1 spot TVD voltage doubler cable like Jack mentioned on my board and use it for the same MXR Resonator pedal you have and it works great. John is right, about $5 less from Truetone. |
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Jim Sliff
From:
Lawndale California, USA
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Posted 11 Jul 2018 10:19 am
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| Quote: |
| Will it work with an 18v/300mA supply? That's about as high as bricks seem to go. |
Not if the specs call for 1000ma. That wart supplies 1//3 the necessary power.
It's basic math. 1000ma = 1A just like 1000mw = 1W, 1000 milliohms (.001 ohm = 1 milliohm) = 1 ohm etc etc.
"milli" - 1/1000.
Most 18v effects need to have their own dedicated power supply and when building boards for clients I never run 18V effects off a multi-port brick. Rarely will a "brick" supply sufficient current (and with "amps" and "ma" were talking "current" - not "power", which would be expressed in watts).
Some 19V effects also run on AC power and it's critical to be aware of the difference! Otherwise you can quickly end up with a cooked power supply, effect, or more than one effect if you daisy-chained them.
The specs are usually higher than actual draw BUT I do not suggest playing around withlower-current supplies with 18v units. It definitely voids your warranty.
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1921 Weissenborn Style 2; Hilo&Schireson hollownecks
Appalachian, Regal & Dobro squarenecks
1959 Fender 400 9+2 B6;1960's Fender 800 3+3+2; 1948 Fender Dual-8 Professional |
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ajm
From:
Los Angeles
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Posted 11 Jul 2018 10:43 am
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First off, to go all of the way back to the original post:
"1.0A-10000mA, right?"
As in, 1.0A = 10,000 ma?
No one else caught this?
At any rate John, the answer is no.
1.0A = 1000ma, NOT 10,000.
Anyway...........
John: You say that the wall wart that YOU ARE USING is spec'ed for 1.0A.
Where did it come from?
Is that the one that actually came with the unit?
Or is it one that someone just gave to you and daid to use?
I would be very surprised if that pedal consumed anywhere near 1 amp.
I'm surprised that some curious animal has never actually measured it.
So.......after I typed this, and did a little internet stalking/prowling/research, Georg's comment is confirmed.
Bradshaw has a link to the manual on their site, and it says:
18 vdc, 18 ma.
I do not understand Jim Sliff's comments regarding voiding the warranty with an under powered supply.
The worst that can happen is that the effect won't work.
I don't see how it can damage the unit and void the warranty.
And just as a general note that doesn't really apply here.........
As someone else said, always be aware of the TYPE of power, DC or AC.
And also be aware of the polarity. |
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Morton Kellas
From:
Chazy, NY, USA 1
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Posted 11 Jul 2018 10:55 am
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| I use a Truetone 1 spot power supply which supplies up to 1700 ma. The voltage doubler, doubles the voltage to the pedal to which it is connected and maintains the ma. Have been using it trouble free for years but never get close to a 1700 ma draw with the small board I am using. May not be the best way to go, but it is compact, light and works for me. |
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Eric Dahlhoff
From:
Point Arena, California
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Posted 11 Jul 2018 4:08 pm Reso pedal current draw
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I actually measured the current draw of my MXR (Bradshaw) Reso pedal when putting together my pedal setup.
It's only 18ma at 18V. 
_________________
"To live outside the law you must be honest." (Bob Dylan) |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Eric Dahlhoff
From:
Point Arena, California
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Posted 12 Jul 2018 6:53 am
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Hey, I'm an American male - I don't read manuals...
_________________
"To live outside the law you must be honest." (Bob Dylan) |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 12 Jul 2018 8:24 am
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| Eric Dahlhoff wrote: |
Hey, I'm an American male - I don't read manuals...
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… should have guessed…
Don't know if it has anything to do with my nationality, but whenever possible I RTFM before buying. Saves me thousands a year by keeping me from buying stuff |
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ajm
From:
Los Angeles
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Posted 12 Jul 2018 9:20 am
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Hey Georg: I'll bet you are one of these types that does your own research first, too.
What a radical, outside the box thinker.
There's this little program that you and I have discovered.
It's not very common, though.
They're sort of an up and comer on the interwebs.
It's called Google.......
There are other ones as well.
I think your tendency towards this is not necessarily due to your nationality.
I sense from your posts that you have an engineering background. Like me.
I try to do my research and find the answers to my questions first.
Then.......I might ask around with some "experts".
Their answers had better ask what I'm expecting them to be.
If not, there's a problem somewhere and we need more investigation.
I did a lot of this before I retired pertaining to investments and what to do with my life savings.
Yeah, I know: Radical. |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 12 Jul 2018 11:01 am
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| ajm wrote: |
Hey Georg: I'll bet you are one of these types that does your own research first, too.
What a radical, outside the box thinker. |
What box?
(Boxes are boring whether one is on the inside or the outside of them, so I have always ignored them.)
Apart from that I don't google anymore, I find research to be a wonderful passtime activity. If only it had been that easy to find, and discard, information when I started my engineering career. |
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John McClung
From:
Olympia WA, USA
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Posted 18 Jul 2018 3:12 am
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Thanks, everyone. First, that was a typo in my original post, the wall wart it comes with is 18v, putting out 1.0A. But the manual does say the pedal itself only draws/needs 18mA.
I'm revamping my pedal board and adding a power brick, and I thought the Resonator was going to be the problem child, no power brick I've seen supplies 18v @ 1A, luckily that's not the true spec.
Anyone have opinions and experience with power supplies? I'm leaning towards the Truetone devices, they have some really good videos on youtube explaining a lot about pedals and power.
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▪️ If you want to have an ongoing discussion, please email me, don't use the Forum messaging which I detest! steelguitarlessons@earthlink.net |
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ajm
From:
Los Angeles
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Posted 18 Jul 2018 8:12 am
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What do you have for pedals on your board? That might be the determining factor.
Also, how are you powering them now? A single DC adapter? Multiple adapters on an AC outlet strip? Other?
A couple of big gotchas:
1) Are any of them AC powered?
2) Are any of them negative powered?
3) (With respect to isolated power sources) Are any of them persnickitty about being powered in a daisy chain? You would know this if you have several pedals at the present time and are using them in a daisy chain power set up, and one of them doesn't want to play well with the others. In very general terms this is usually not a problem. However, I have heard of and actually have two pedals that do not like being daisy chain powered and insist on having their own power source. (For the curious, they are a Hermida Nu Valve dist/OD, and a Big Knob Vibe Tone univibe/rotary speaker simulator.)
A lot of these "brick" type power supplies are not isolated outputs. That can lead to not being able to power up negative polarity pedals, as well as having a pedal or two that do not like being daisy chain powered. |
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b0b
From:
Cloverdale, CA, USA
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Posted 18 Jul 2018 3:10 pm
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FWIW, the 18v DC supply that comes with the Resonator is rated for 500ma. If it really only draws 18ma, you could power 35 of them with it.
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