Well... I tried to find something in the other posts to help me with this, but I really don't find... or I used the search engine in the wrong way, or it doesn't have been created... don't know...
I'm looking for a specific kind of power supply for my pedalboard, but didn't find it anywhere... so, I decided to try to make this supply... but, my knowledge in electronics isn't so solid, so I'll probably need some help with this...
I want a psu with 20 outs, regulated, noise free, with the outs isolated from each other... 18 of these could be 9V (tip negative) for the standard Boss-like pedals, and 2 of them I'd like to have a pot to control the voltage between 9V and 18V, to use it with pedals that accept this "high" voltage...
I like this psu support a total load current between 1,5A and 2A, cause I use a lot of effects, but most of them are drives or digital effects... a few of them are analogic, so I think that the current draw isn't to high...
If anyone here could help me to start this project, I'll be grateful.
Thanks
I'm looking for a specific kind of power supply for my pedalboard, but didn't find it anywhere... so, I decided to try to make this supply... but, my knowledge in electronics isn't so solid, so I'll probably need some help with this...
I want a psu with 20 outs, regulated, noise free, with the outs isolated from each other... 18 of these could be 9V (tip negative) for the standard Boss-like pedals, and 2 of them I'd like to have a pot to control the voltage between 9V and 18V, to use it with pedals that accept this "high" voltage...
I like this psu support a total load current between 1,5A and 2A, cause I use a lot of effects, but most of them are drives or digital effects... a few of them are analogic, so I think that the current draw isn't to high...
If anyone here could help me to start this project, I'll be grateful.
Thanks
A big power trans,bridge,and filtering caps..That could feed 20x regulators,7809's for the 9V outputs,and a couple LM317's for the adjustable outputs.. You could even put a DPDT switch on the adjustable outputs,to swap the polarity on the plugs (tip or sleeve positive.)
Voodoo labs makes a multi pedal supply. I cloned it and made a Voodoo Who for a friend.
I took a 160VA 18-0-18 toroid, 5 amp BR, and a pair of 2,200uF caps and had several +/- 18, 15, 12 and 9 volt regulators (with local reservoirs) paralleled. He and I agreed that the pedals generally sounded better on the regulated higher (12V) feeds than the stock 9v wall warts.
I took a 160VA 18-0-18 toroid, 5 amp BR, and a pair of 2,200uF caps and had several +/- 18, 15, 12 and 9 volt regulators (with local reservoirs) paralleled. He and I agreed that the pedals generally sounded better on the regulated higher (12V) feeds than the stock 9v wall warts.
DigitalJunkie
Thanks man...
This things I've already thought about... my problem now is how to start the schematic before the diode bridge, and where I put the filtering caps... before that, I could begin to imagine where I can put the regulators and CIs...
troystg
The Voodoo 2+ is the one that I want... but, it has only 8 outputs, so it isn't for me... and, here in Brazil, this psu costs a lot of money, and I'll need two of them... so, it's impossible for me, at the present moment, to catch them...
But, how you said that you cloned it, what could you say to me? Is it hard to do something near of this Voodoo psu?
Thanks man...
This things I've already thought about... my problem now is how to start the schematic before the diode bridge, and where I put the filtering caps... before that, I could begin to imagine where I can put the regulators and CIs...
troystg
The Voodoo 2+ is the one that I want... but, it has only 8 outputs, so it isn't for me... and, here in Brazil, this psu costs a lot of money, and I'll need two of them... so, it's impossible for me, at the present moment, to catch them...
But, how you said that you cloned it, what could you say to me? Is it hard to do something near of this Voodoo psu?
Simple drawing.
EDIT:
X-former = 18-0-18 if your going to use +/- 18 volt regs, minimum of 12-0-12 and at least 160VA.
Bridge Rectifier should be at least 5 amps.
Main supply caps should be at least 1,000 - 2,200uF.
I used the standard 1 amp regs and paralleled 3 jacks off of each since the pedals were generally rated for 250mA @ 9VDC.
Secondary caps were 440uF.
Again, all the pedals sounded better with the 12 volt supplies, but it is up to YOU to ensure yours are safe with it.
EDIT # 2:
Note that this was not for me, it was for a couple of professional musicians. They still use them daily for 4 yrs, and I still have not heard a complaint which we all know they would whine if there was an issue.
EDIT:
X-former = 18-0-18 if your going to use +/- 18 volt regs, minimum of 12-0-12 and at least 160VA.
Bridge Rectifier should be at least 5 amps.
Main supply caps should be at least 1,000 - 2,200uF.
I used the standard 1 amp regs and paralleled 3 jacks off of each since the pedals were generally rated for 250mA @ 9VDC.
Secondary caps were 440uF.
Again, all the pedals sounded better with the 12 volt supplies, but it is up to YOU to ensure yours are safe with it.
EDIT # 2:
Note that this was not for me, it was for a couple of professional musicians. They still use them daily for 4 yrs, and I still have not heard a complaint which we all know they would whine if there was an issue.
Attachments
This may seem obvious, but since it hasn't been mentioned, I'll go ahead and point out that if this is for a pro rig that will be used onstage with lights, good shielding is paramount. I am actually surprised by the block diagram of the Voodoo, I would have expected it to have at least some kinds of EMI snubbing resistors, caps, or chokes.
I always use a filtered AC input socket, but neither one has complained about noise. In fact they are probably quieter that the supplied wall warts.
Of course, if your making it for a professional / stage application you might as well incorporate the shielding before hand to save you the trouble later.
Use a metal enclosure, ground it well, and use noise filters internally.
Side note, I built an amp switcher for a musician and ended up having to run his mic through it to equalized the ground potential between the guitar and the mic screen. Stage power is AMAZINGLY unpredictable.
Of course, if your making it for a professional / stage application you might as well incorporate the shielding before hand to save you the trouble later.
Use a metal enclosure, ground it well, and use noise filters internally.
Side note, I built an amp switcher for a musician and ended up having to run his mic through it to equalized the ground potential between the guitar and the mic screen. Stage power is AMAZINGLY unpredictable.
troystg said:
What I actually was suggesting was designing for EMI pickup at the device itself, not so much as that picked up by the AC supply cables.
troystg
I'd like to thank you again...
Well... all of my pedals work with tip negative inputs... so, I want to know if could be any problem if I use only the negative/positive part of the rectified signal path to feed the pedals? Or I need to use both of them?
only the But, I really don't know if I'll need to use a 18-0-18 transformer, cause in my head, I probably will need only the
By the way, I don
leadbelly
Thanks for your considerations... but, could you tell me what is this EMI that you talked about?
I'd like to thank you again...
Well... all of my pedals work with tip negative inputs... so, I want to know if could be any problem if I use only the negative/positive part of the rectified signal path to feed the pedals? Or I need to use both of them?
only the But, I really don't know if I'll need to use a 18-0-18 transformer, cause in my head, I probably will need only the
By the way, I don
leadbelly
Thanks for your considerations... but, could you tell me what is this EMI that you talked about?
Moderator
Could you simple ignore (or erase) the last post? I typed something that send the message before I had finished it...
troystg
I'd like to thank you again...
Well... all of my pedals work with tip negative inputs... so, I want to know if could be any problem if I use only the negative/positive part of the rectified signal path to feed the pedals? Or I need to use both of them, as you put in the drawing?
By the way, I don't know if I'll have some problem using 12V in the outputs, specially the digital ones (delay)... I never tried this with my pedals... the only that I'm sure that won't be affected in the wrong way is my Barber Direct Drive SS, that accepts 9V to 18V...
And, I'm not a professional musician yet, but I'm working hard to achieve this status... I'm trying to become a sideman, and continue with my band... so, I need something that I could trust in, if you know what I mean!
leadbelly
Thanks for your considerations... but, could you tell me what is this EMI that you talked about?
Could you simple ignore (or erase) the last post? I typed something that send the message before I had finished it...
troystg
I'd like to thank you again...
Well... all of my pedals work with tip negative inputs... so, I want to know if could be any problem if I use only the negative/positive part of the rectified signal path to feed the pedals? Or I need to use both of them, as you put in the drawing?
By the way, I don't know if I'll have some problem using 12V in the outputs, specially the digital ones (delay)... I never tried this with my pedals... the only that I'm sure that won't be affected in the wrong way is my Barber Direct Drive SS, that accepts 9V to 18V...
And, I'm not a professional musician yet, but I'm working hard to achieve this status... I'm trying to become a sideman, and continue with my band... so, I need something that I could trust in, if you know what I mean!
leadbelly
Thanks for your considerations... but, could you tell me what is this EMI that you talked about?
12-0-12 is good for 9 volt supplies, and you do not need to use negative regulators if you don't want to.
If the transformer has DUAL secondaries (not center tapped) you can parallel the secondaries.
EMI = Electo Magnetic Interference
And if you use a properly grounded metal enclosure with an input AC filter you should not have to worry about EMI getting in the power supply, only the leads out to the pedals.
But Leadbelly does make a good point to go the extra step and prevent it before hand..
If the transformer has DUAL secondaries (not center tapped) you can parallel the secondaries.
EMI = Electo Magnetic Interference
And if you use a properly grounded metal enclosure with an input AC filter you should not have to worry about EMI getting in the power supply, only the leads out to the pedals.
But Leadbelly does make a good point to go the extra step and prevent it before hand..
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