Newb - OP24 Preamp help!

floorcovering Posted 2013-02-03 2:18 PM (#464885) Subject: Newb - OP24 Preamp help! Joined: February 2013 Posts: 1 I'm new here, and looking to find some help relating to my OP24 preamp in my recently acquired Ovation Legend 1756 12-string. I've been trying to make an external power supply to run the preamp via a stereo (TRS) cable, as I don't really want to have to keep taking off my strings to replace the internal battery. I thought this would be easy, as I have basic understaning of electronics, and I know it works because my other Takamine 6 string powers it's preamp in this way (and there are other external power pedals eg X-Bat which do just this) But I just can't get it work with the OP24. I seem to be able to get power to the preamp, but I 'm not getting any audio signal coming back. Basically I'm send +9v to the ring which is then going to where the internal battery +9v goes to. But I'm confused about what to do with the grounds as there is a 0v rail on the PCB and a ground rail also on the PCB. Maybe it just won't work, but I'd like to find a solution! Many thanks for any light people can shed on this for me. Old Man Arthur Posted 2013-02-03 2:51 PM (#464886 - in reply to #464885) Subject: Re: Newb - OP24 Preamp help! Joined: September 2006 Posts: 10777 Location: Keepin' It Weird in Portland, OR The OP-24 is not wired for phantom power. With the OP-24 preamp you may have to change the battery once a year. You can just change the battery when you change the strings if you are concerned about losing power. Use a fresh alkaline battery and it should last a year. (be sure to unplug the guitar when not in use) Sending electricity in through the out door might fry electronics that are not designed for that.