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Help with an electro-magnetic field detector

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I am currently working on an electro-magnetic field (EMF) detector. I built the circuit from this diagram, Electromagnetic Field Detector , and it works fine, but I would like to convert the tone signal (headphones) to a vibration. I figured I would switch the headphones with a vibrating motor, but I think I am not getting enough voltage across the vibrating motor. I've been experimenting with different setups in hopes of amplifying the voltage across the vibrator, but none have been successful. I don't have a lot of background with circuits so I don't understand exactly what is wrong or what would be a solution. If anyone could give me ideas, thoughts, and/or sites, anything will help.

Note: The vibrator that I purchased is a 3V DC micro-vibration motor.
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