This driver and LED lamp is designed for the classic overhead projection type ripple tank. It features variable DC output for the motor, and another output for the LED. Electronics in the unit measure the oscillation of the unbalanced motor to calculate thefrequency of the waves it generates, and can therefore modulate the LED to freeze or slow down the waves without the need of stroboscope. Compatible with ripple tank BEES code 0490 and most similar ripple tanks from other suppliers.