Need help to vibrate a motor for an original musical instrument

audiomotor

everyone. I am asking you to help me out for making original musical instrument.
The goal is to vibrate a small motor by square wave signal witch is generated in a synthesizers in my Mac.

Here is what I tried;

Square wave sound (in my laptop)
-> stereo output
-> stereo cable
-> headphone amplifier
-> stereo cable
-> motor

I cut the end of the stereo cable to connect the left(or right) wire and the ground wire.
(please check the photo below)
enter image description here

However, it doesn't work. I could hear the sound from the amplifier by headphone, so there might be problems between the amp and the motor.

Let me tell you the specs of the amplifier;
make/model: Pyle Audio, PHA40
input impedance: 100K-ohm, Unbalanced
Max Input Level: +15dBu
output impedance: 80-Ohm, Unbalanced
Max output Level: 40mW in 100ohm
Max Gain: 20dB
S/N Ratio: More than 90dB
THD: Less than 0.03%

And the motor is DC 1.5-6V 1750-7000(<- I have no idea what does this, mA?)

Hope I can get any ideas/answers from you guys.

Thanks,

Best Answer

The voltage from your amplifier is AC so on average it's 0v, and even if it's swinging above 1.5v it's not doing so for long enough, or with enough current capability, to even get the motor started.

First try creating a source of DC for the motor, perhaps with a transistor, then you can think about making the speed controllable / modulatable.

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