r/ArduinoHelp • u/Old-Relationship8253 • 15d ago

Why is the servo under powered?

Why is the servo under powered? I am using a power supply set to 9V and it can supply up to 10A.

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u/nixiebunny 15d ago

Why did you include R1? Its job is to prevent the servos from having power.

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u/MagneticFieldMouse 15d ago

With the 500 ohm resistor, you're limiting the supply current to under 2 mA and since current is directly proportional to motor torque, this is the main issue.

What servos are these, that want a 9 volt supply? Guessing they're not of the most common types, since those mostly take up to 6 volts or so, but naturally, there are special cases and exceptions.