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February 18, 2015 at 12:07 am #138316
The H9 will run fine on 9v to 12 v DC. This is written on the back. Also, both the power supply I got with my H9 core and max are both 9V DC.
The barrel is nothing "special". It is 5.5 mm, which is a common size. In any case make sure the tip is positive for the H9.