DC REGULATED POWER SUPPLY FOR MILLIKANS OIL DROP APPARATUS – GUPTA BRAND 200161 Posted on March 1, 2017May 2, 2017 by admin Output Voltage/Current : 0-300VDC/10mA (With reversing switch to change the polarity at the output terminals) L.T. Voltage/Current : 6.3VAC/1Amp,with 1 Round meter.