Abstract: A switched digital drive system is used to actuate an ink jet printhead having a spaced, parallel series of internal ink receiving channels opening outwardly at front ends thereof through ink discharge orifices formed in the printhead body. The channels are laterally bounded by a spaced series of piezoelectrically deflectable internal sidewall sections of the printhead body interdigitated with the channels. The drive system includes a series of electrical actuation leads each connected to a different one of the sidewall sections, and dual transistor switch structures connected in the leads with each switch, in turn, connected to positive and negative DC voltage sources.