In a constant current sink from the two NPN transistors, load and sensing resistor, application of increasing voltage on the base of the transistor produces practically linear increase in output current. How to describe this relation (slope) between applied voltage and output current?
Electronic – the formula for the dependence between modulating input voltage – output current for two transistor constant current sink
constant-currentcurrent-sink
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Best Answer
It's a non-linear transfer function. Where impedance ratios affect gain Rin = (hFE * Re) + R1 (10k)
If Re=30~33 Ohms or about the same ESR as two 5mm LEDs then current is limited to ~ 20mA.
Then check the ratio of Rb/Re.