Help Needed Adding Power Jack 18V

[davec69]

I was hoping someone could help me with the wiring of a power jack.  One of my favorite pedals is my "Colorsound Power Booster", which runs off two 9v batteries.  Needless to say, I'm tired of replacing batteries in this thing, which requires popping the back off the pedal. 

I've decided to add a power jack to the pedal, and run it off a 18VDC 150ma adapter that I have lying around, but I wanted to put the idea forth here beforehand, because I do not want to damage this pedal.

My idea is to remove the two batteries, then snap on 2 new battery snaps in place of the batteries.  Like this. but 2x:

http://www.generalguitargadgets.com/diagrams/pjsnap.gif

This leave me with a red and a black wire coming from each snap.  I would then take the red from one snap and the black from the other snap and solder them together.  Which leaves me now, with on red and one black wire which I would solder to the newly added power jack.

The adapter that I have is tip negative so I'm guessing that I need to solder the black wire to the tip of the jack, and the red to the outside connection on the jack.

Does anyone see any flaws in this idea, before I go and screw up my pedal?  Any comments would be appreciated.

[davec69]

Any Ideas?  Anyone?

[petemoore]

This leave me with a red and a black wire coming from each snap.  I would then take the red from one snap and the black from the other snap and solder them together.  Which leaves me now, with on red and one black wire which I would solder to the newly added power jack.
  'Sounds about right, if I'm following, then the red [in a Neg Gnd circuit] would go to V+ and the black to ground.

The adapter that I have is tip negative so I'm guessing that I need to solder the black wire to the tip of the jack, and the red to the outside connection on the jack.
  Make certain the polarity is correct, using the DMM.
  Measure the actual output voltage of your adapter, all the parts must be rated for that voltage [or whatever voltage they'll see].
  Does anyone see any flaws in this idea, before I go and screw up my pedal?  Any comments would be appreciated.
  Seems straightforeward enough, just connect the adapter+ to V+, and the other side to Gnd. {{Unless... the "Colorsound Power Booster is a Pos Gnd Circuit...you can just follow from the battery + [almost always the red wire] if that goes to V+, then it's neg gnd. {If the battery red goes to ground...then it'd be a Pos Gnd. circuit.
  basically make sure + still goes to + but from the adapter, don't overvoltage any components.

[sfr]

Is the pedal in question running off of two batteries because it runs off of 18V, or is it running off of two batteries because it runs on a bipolar powersupply? (+9v and -9V?)  I know nothing about this pedal, but your proposed method wouldn't work if it's the latter, I don't believe. 

[zjokka]

The adapter that I have is tip negative so I'm guessing that I need to solder the black wire to the tip of the jack, and the red to the outside connection on the jack.

Slight detail: make sure you have an isolated (plastic) dc power jack.
You could also add a protection diode to your circuit to make sure.

zj

btw: high voltage boosters really is the way to go.

[davec69]

 Thanks. I do have a plastic power jack. Ok guys, this is what I have.  I have a red wire coming off the board which goes to the first battery connector.  The black from that connector, connects to the red of the second battery connector. Then the black from the second connector goes to the output jack.  Here's som pics if it helps.  In the 2nd picture, you can see the red wire coming off the board and going to the first connector:

[davec69]

I thought these might help.