Reference voltage source using BJT

Published:2011/11/23 2:21:00 Author:May | Keyword: Reference voltage source using BJT | From:SeekIC

This circuit adopts voltage regulator tube D1, transistor T and resistor R1, R2 to make up constant-current source. It can supply for parallel circuit composed of reference diode D2 and load resistor RL (here is 68kΩ). Its current is about 7.6mA. Because the current on D1 is much higher than base-emitter current of transistor and the current on D1 is designed to be very high (5mA), the change of emitter current and reference diode current caused by the dispersion of transistor data and input current is very small.



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