A dispenser for transferring a predetermined quantity of a liquid, comprising: a longitudinal transducer, comprising: a capillary tube having a tip at a distal end of the capillary tube; a piezoelectric actuator clamped to the capillary tube at a location proximal of the tip by a double V clamp (142b, 144b) without a sleeve between the double V clamp and the capillary tube; an aperture at the tip of the tube having a diameter of 100 microns; and a flexible supply line located upstream of the capillary tube and configured to couple to and supply the liquid to the capillary tube; wherein actuation of the piezoelectric actuator by a piezoelectric voltage causes a pressure wave to propagate from said location of the capillary tube toward the tip of the capillary tube such that radial motion at said location of the capillary tube is transmitted as distally extending axial motion of the tip of the capillary tube, thereby causing a droplet of a predetermined volume to be ejected from the aperture; wherein the capillary tube is formed of polyether ether ketone (PEEK) having a modulus of elasticity in a range of about 0.68 to 10.35 GPa (0.1-1.5 × 10 6 psi) thereby dampening acoustical noise from the actuation of the piezoelectric actuator; wherein a charge resistor is coupled with the piezoelectric actuator and configured to modify acceleration of the piezoelectric actuator; and wherein the dispenser is configured such that adjustments to the piezoelectric voltage and the charge resistor vary the predetermined volume of the droplet ejected from the aperture over an entire range of drop sizes from about 80 to 1300 pL using the aperture. a longitudinal transducer, comprising: a capillary tube having a tip at a distal end of the capillary tube; a piezoelectric actuator clamped to the capillary tube at a location proximal of the tip by a double V clamp (142b, 144b) without a sleeve between the double V clamp and the capillary tube; an aperture at the tip of the tube having a diameter of 100 microns; and a flexible supply line located upstream of the capillary tube and configured to couple to and supply the liquid to the capillary tube; wherein actuation of the piezoelectric actuator by a piezoelectric voltage causes a pressure wave to propagate from said location of the capillary tube toward the tip of the capillary tube such that radial motion at said location of the capillary tube is transmitted as distally extending axial motion of the tip of the capillary tube, thereby causing a droplet of a predetermined volume to be ejected from the aperture; wherein the capillary tube is formed of polyether ether ketone (PEEK) having a modulus of elasticity in a range of about 0.68 to 10.35 GPa (0.1-1.5 × 10 6 psi) thereby dampening acoustical noise from the actuation of the piezoelectric actuator; wherein a charge resistor is coupled with the piezoelectric actuator and configured to modify acceleration of the piezoelectric actuator; and wherein the dispenser is configured such that adjustments to the piezoelectric voltage and the charge resistor vary the predetermined volume of the droplet ejected from the aperture over an entire range of drop sizes from about 80 to 1300 pL using the aperture.