Adjustable voltage finger driver

The present invention relates to a device for driving a print head of an image forming apparatus. More particularly, the present invention is directed to a circuit for generating an adjustable control voltage applied to electrodes in a print head of a charge deposition printing system. The present invention provides a method and circuit for driving control electrodes between a reset voltage and an adjustable control voltage. The circuit includes a reset switch capable of assuming a first state and a second state, the reset switch including a first terminal connected to a first voltage source; a plurality of diodes, each one of the plurality connected between a second terminal of the reset switch and a corresponding one of the control electrodes; and a plurality of voltage control switches, each voltage control switch being capable of assuming an active state and an inactive state, each voltage control switch including a first terminal connected to a corresponding one of the control electrodes and a second terminal connected to a second voltage source, wherein the extraction voltage supplied to a control electrode is adjusted by adjusting the length of time that the corresponding voltage source is made active.