Transistor as current source

 

1) Transistors have a fixed degree of amplification. (Hfe)

2) When a transistor is at maximum amplification it is saturated. Saturation works when we want to pass the maximum amount of current though the transistor.

3) By limiting the voltage at the base, we can limit the current through the circuit.

4) Somewhat against intuition, when we limit current with a transistor, it's called amplification, because the small amount of voltage at the base is controlling the large current flow.

4) Ic = (Vb- 0.6v)/R

 

 

 

 

 

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