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For this task you should use an extra power supply not running trough the Arduino. For this kind of setup I use PCA9865 16-channel servo dirver board cost around 5$, needs two pins only and can run all servos (strong 5V power supply provided => Amperage) simultaniously. For a max of 8 servos a 5V/2-2.5A power supply (wall wart) should be sufficient. See this ...

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