ahmedragia21
Member
Hi i would like to read an answer for this questions
1. For a bjt whethere its used as an ampilifier or as a switch , does the Ic component is drawn from the supply depends on the current of the base multiplied by beta ? is this what Ic = B Ib means ? so a bjt just senses the Ib and output the amplified current ? but how the output is dc component with ac component from where is there the ac component ?
2. How in the FETs and MOSEFTs there's no Ig and there's a voltage on the gate , you will say the gate is insulated yea , so how the VG affects the FET to control the Idrain ?
3. If i wanted to have a constant 3.3V i would form a voltage divieder using two resistors .. but why we dont use it instead of voltage regulators ? maybe because resistors doesnt supply a constant current ? or because of the limited power disspation in resistors ?
Thanks
1. For a bjt whethere its used as an ampilifier or as a switch , does the Ic component is drawn from the supply depends on the current of the base multiplied by beta ? is this what Ic = B Ib means ? so a bjt just senses the Ib and output the amplified current ? but how the output is dc component with ac component from where is there the ac component ?
2. How in the FETs and MOSEFTs there's no Ig and there's a voltage on the gate , you will say the gate is insulated yea , so how the VG affects the FET to control the Idrain ?
3. If i wanted to have a constant 3.3V i would form a voltage divieder using two resistors .. but why we dont use it instead of voltage regulators ? maybe because resistors doesnt supply a constant current ? or because of the limited power disspation in resistors ?
Thanks