Abstract
This paper presents a methodology to develop direct current sources using BJT transistors on the linear region (active region). This region depends on the saturation voltage, maximum power and polarization voltage of the element; from these parameters it is obtained the load resistance range that ensures a constant current. The methodology is used to develop a DC current source prototype of 2A and the range of the load resistance is defined by the transistor characteristics. The temperature and power constrains are taking into account.
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