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Originally Posted by Nick R.
i know that potentiometers as well cause thats whats in a speaker with volume control...
really appreaciate help!
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Engineers like to use the volume control analogy to demonstrate the variable nature of a pot. In you stereo though, the pot is contolling a very tiny voltage at the input of a big power amp. As you turn up the volume the power amp output also rises. Don't try hooking up a pot to your servoes, as Ken said the signals are different. There is actually a tiny circuit board inside with a custom integrated circuit and other components that drive the servo motor. It acts as a power amp, but the input signal is PMW so it has to be converted into a signal the motor can use.