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Build your own Variable Lab Bench Power Supply
DIY Ambient Lighting with Hyperion. Works with HDMI/AV Sources || Raspberry Pi
It sounds like its the RCD circuit tripping the power and not a short circuit. This happens when the current is able to follow a path that isn't though the normal Live-Neutral and instead is able to follow the earth. If the neutal is connected to the earth inside the 12v supply then this is probably the problem. If you can seperate these then that would solve the problem.
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