18 v phantom power supply

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hello from Barcelona
I'm an spanish electric guitar designer. I'm working in a guitar, powered with two 9 v batteries. I would like to supply the guitar from de amp cable, with a stereo chord, like phantom power in microphnes or like the Line 6 Variax System.
Community: Variax XPS & V.D.I. Cable F.A.Q.s
LINE6 XPS MINI POWER SUPPLY - Thomann Cyberstore Español
My guitar has a Fernandes Sustainer and a midi system form Graphtech. I would need take the voltage from the stereo 1,4" plu g. Esternal transformer, and the circuit in a box with two 1,4" pluggs.
Anybody can help me?

flow
flowguitars@gmail.com
tlf: 34- 671820145
 
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