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I'm trying to get 12v from two 9v batteries. Using resistors, I managed to get the bottom battery to 3v but when I tried adding them, it resulted in 9v. What am
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PreSonus HP2-15 Personal Headphone Amplifier Battery-powered Stereo Headphone Amp with TRS Inputs, 9V Battery or DC Power Supply, and Belt Clip - Musical Garage USA LLC
Hi Watt High Power 6F22M 9v Batteries, 82.0 Grams, Capacity: 9 Volts, | ID: 21937943933
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