Circuit for operating recording nozzles

A circuit for operating a plurality of recording nozzles in an ink mosaic recorder, each said recording nozzle having an associated channel which is cylindrically surrounded by a piezoelectric transducer having a diameter which expands upon the application of a voltage to said transducer having a polarity opposite to a direction of polarity of said transducer and which contracts upon the application of a voltage to said transducer having a polarity corresponding to said direction of polarization of said transducer, said circuit comprising:

• a charging circuit for selectively connecting said transducers to a voltage source in a rest state, said voltage source being common to all said transducers and having a polarity in said direction of polarization of said transducers for causing said transducers to assume a state of contracted diameter;
• a plurality of discharging circuits individually connected to said transducers and each operable by a separate control unput for discharging the transducer connected thereto to zero volts for causing said transducers to assume a state of expanded diameter for a selected period of time;
• and
• a switching means in said charging circuit for selectively interrupting operation of said charging circuit independently of the operation of said discharging circuit.