A method and apparatus to manage delay in a multimedia conference session is described. The applied drive voltage is provided at a level that drives a transition over the entire surface of the optically switchable device but does not damage or degrade the device. Further, the first electrode is preferably formed to include the nickel equal to or greater than 0. The first radially separated electrode is arranged so as to be apart from the second radially separated electrode. The current source unit is for providing one of a positive or negative current source to an output node at which the output reference voltage is provided.