A delay circuit for a fan includes a signal generation circuit, a first switch, a delay microchip, and a second switch. Said second electrode is movable with respect to said first electrode whereby an electric potential applied between said first and second electrodes causing said second electrode to move relative to said first electrode a distance X,, where X is a nonlinear function of said potential,. The canonical transform is applied to the template curve to generate a mapped template curve. The second electrode includes a plurality of second openings provided in a regular checkered pattern with each second opening having a shape extending in the first direction.