# Shaking servo motor

**URL:** <https://forum.arduino.cc/t/shaking-servo-motor/932852>\
**Category:** Motors, Mechanics, Power and CNC\
**Created:** [December 6, 2021, 5:48pm UTC](https://forum.arduino.cc/t/shaking-servo-motor/932852 "2021-12-06T17:48:10Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![groundFungus](https://avatars.discourse-cdn.com/v4/letter/g/73ab20/32.png) [@groundFungus](https://forum.arduino.cc/u/groundFungus)\
**Post date:** [December 6, 2021, 6:26pm UTC](https://forum.arduino.cc/t/shaking-servo-motor/932852/3 "2021-12-06T18:26:36Z")

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Is that a 9V smoke alarm battery (PP3) powering the servo? If so, that very likely may be the problem. Not only is 9V too much voltage for a servo, those batteries can not supply very much current. When you try to pull too much current the voltage will drop, like you are seeing. A 4 AA cell battery pack is a better supply for a servo.

PP3 batteries should have a warning on them, "Do not use for Arduino projects".

[This tutorial is a starting point on how to draw a good schematic.](https://forum.arduino.cc/t/how-to-make-a-schematic-you-can-post/675103)

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