That's the same one I am using in my TWD. Works great. Adjustable down to a low pur or rocking the house.
Quoted from smailskid:I am considering wiring in this board between the shaker motor board and the motor in order to control/reduce the intensity of the shaking. It is a Stern shaker in Metallica.
Any reason why this wouldn't work?
ebay.com link » Dc 6v 28v 3a Pwm Motor Speed Variable Regulator Controller Switch