I need at least 2 vibration sources that can vibrate in the range of 100hz to 200hz and be able to be turned off and on between 4 and 40 times per second. For a different project is used 2 Solid State Relays to provide the on/off switching. That should work on this project. What I am at a lost is to source a device that can output the 100hz to 200hz vibration. My search lead me to Tetonic Compact Audio Exciter, Micro Speakers from Regal, and adafruit Speakers. Input on better or just alternative devices would be appreciated. BTY, I need to "mount" the device on a Velcro strip so that they can be placed on the arm, so not too heavy nor too hot in temperature.
I haven't yet researched how to drive any of these devices at the required frequency. I would expect a simple alternating current would suffice.