![]() But when transistor goes into the saturation region the transistor acts as a closed switch and current completes the path. When the transistor operated in the cut off region means its acting as a open switch and the buzzer doesn’t blow in this case. Same condition is in the case of transistor. ![]() But when the switch is open the its breaks the circuit and buzzer doesn’t blow. When switch is in closed condition the circuit completed and current flows across the buzzer. In this figure a buzzer is operated with a mechanical switch. In the figure below a comparison is made with the mechanical switch and the transistor as a switch. If V b is greater than 0.7V it acts as a closed switch and when V b is lower than 0.7 V it acts a open switch. Its totally depends upon the Base bias voltage V b . So now you can understand how a transistor acts a switch. In this state the transistor acts as a closed switch.Īlso Check: How to Create Relay Logic Circuit But when the base bias voltage increases from 0.7 V the base saturated the collector and the current starts flow. The transistor operated in the cut off region. When the base bias voltage is lower than 0.7 V. The conditions for the transistor in the saturation region are Vb 0.7 V, Collector Current ( Ic) = maximum, Collector to Emitter Voltage ( V CE ) = minimum. So this region is called as cut off region. Which creates a large depletion region and no current flows through the transistor. But the collector to emitter voltage V CE is maximum. So the collector current Ic is also negligible. In the transistor the collector current is directly proportional to the base current. In the cut off region the base voltage is less than 0.7 V so the base current is also negligible. When we are using the transistor as switch we deals with only saturation region and cut off region. ![]() The characteristic curve above shows the three regions. ![]() Transistor characteristics curve with full details ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |