High Input Voltage Linear Rgeulator

the LM317, cannot handle input voltages in excess of about 30 V. The LR8A from Supertex Inc is a new, adjustable three pin regulator that can accept input voltages up to 450 V and can supply an output current of 0.5 mA to 10 mA. Using this device it is possible to work with rectified 230 VAC.The LR8 has a wide input voltage range of +12 V to +450 V. Two external resistors (R1 and R2) allow the output voltage to be adjusted from 1.20 V to 440 V provided that the input voltage is at least 10 V greater than the output voltage.