Wiring DC jack and battery.... Help I'm new to this.

[demonstar]

Hi, I'm just about to start making my first electronics project. I chose a distorion pedal and I've all planned and I'm ready to go for it except for one thing. I found the wiring diagram for it a I'm unsure as to whether if I put a battery and the DC jack on at the same time would I provide 18V to my board and damage it or will the battery cut out of the signal chain. I would like it to cut the battery out the signal chain when i plug the DC jack in, like commercial products. Is this easy to do  and if so how would I do it? Any help would be much appreciated!

This is the wiring diagram. I'm doing option 5. With the 3PDT, LED, Battery and DC jack.
http://www.tonepad.com/getFile.asp?id=76

[dot1q]

HI!
look this...

http://www.beavisaudio.com/techpages/PedalPower

[MartyMart]

If you follow the wiring diagram you'll be fine, circuit is battery powered and then gets "cut off" when a
9v DC plug is inserted into the DC socket, there's a sleeve connection that's "floating" and the barrel of the
DC jack touches and pushes it away - disconnecting the battery.
MM.

[demonstar]

Thankyou very much!

[petemoore]

  I'd try verifying everything especially including no shorts to PS under all conditions before applying voltage.