What are some ICs that can turn 5v DC into 5v AC? How about 9v DC into 9v AC?
I'm wiring up the liquid-crystal lenses from active shutter 3D glasses to be electric-powered sunglasses. Depending on the lens model, they need either 5v or 9v to go fully dark.
They can work when powered by DC (which is what I'm currently doing), but this biases the crystal and dramatically lowers its lifespan. Instead, they should be driven by AC with a frequency between 30 Hz - 100 Hz (see: http://www.pacificdisplay.com/lcd_static_drive.htm).