Electronics Switch

This type of switch preform switching operation (i.e ON or OFF current) in an electronics or electrical circuit with the help of electronics components such as transistor ,tubes etc. It has many advantages and popular because of their high speed of switching operation and no sparking in the circuit..Transistor ,SCR, Tubes etc are used as a switch.In the case of transistor switch, it operates at saturation region or at cut off region.

• The transistor is cut off region or no cur5rent flows in collector load , when input base voltage is proper amount of negative potential .At this condition ,there is no voltages drop across the collector resistor or load and the out put voltage is theoretically Vcc.

Therefore,

Ic=0 and

Vce=Vcc

This condition shows that ,it is open circuit (i.e OFF state).

• The transistor is in saturation region or current flows in collector resister or load, when base input voltage is proper amount of positive potential. In this condition, almost whole voltage(Vcc) will dropped across collector resister or load and out put voltage is theoretically zero.

Therefore,

Ic=Isat and VCE=0

This condition shows that ,it is a closed circuit (i.e ON state).

Advantages:

This type of switch have following advantage than other type of switch:

1. It preform noiseless switching operation because of no moving parts in this type of switch.
2. The size and weight of its is smaller than other.
3. It has easy to maintenance .
4. It has lower cost than other.
5. It has very fast speed of switching operation than other type of switch.
6. It give well services (i.e trouble free) than other.