Texas instruments lm334z to92 adjustable precision power source texas instruments lm334z p this is the texas instruments lm334z 3 terminal adjustable current source the regulator only needs one resistor to set the output current no seperate power supply connections are needed as this is a true floating current source it can have up to 20v reverse voltage applied and will act as a rectifier allowing only a few microamps of current o flow with the addition of another resistor and a diode t