Hi all
I have a homework question which i would like someone to verify my results please.
I have a npn transistor. Rl and Rb are not given. Common emitter configuration.
Vcc is 18V. Power is 2W.
So using P=VI, transpose this gives me I = P/V = 2/18= 111mA
Hfe is IC/IB Note hfe min is 180
Ib is therefore ic/hfe = 111mA/ 180 = 616uA
If the input to base is 3V, then to calculate
Rb is
3-vbe/Ib, this is then 3-0.7/616uA= 1.8K.
Dies this seem correct??
I have a homework question which i would like someone to verify my results please.
I have a npn transistor. Rl and Rb are not given. Common emitter configuration.
Vcc is 18V. Power is 2W.
So using P=VI, transpose this gives me I = P/V = 2/18= 111mA
Hfe is IC/IB Note hfe min is 180
Ib is therefore ic/hfe = 111mA/ 180 = 616uA
If the input to base is 3V, then to calculate
Rb is
3-vbe/Ib, this is then 3-0.7/616uA= 1.8K.
Dies this seem correct??