Transistor as a switch, Electrical Engineering

Transistor as a switch:

Transistors are generally employed as electronic switches, for both of the high power applications including switched-mode power supplies and low power applications like logic gates.

In a grounded-emitter transistor circuit, like the light-switch circuit shown, as the base voltage increases the base and collector current rise exponentially, and the collector voltage drops due to the collector load resistor. The appropriate equations:

VRC = ICE × RC, the voltage across the load (the lamp with resistance RC)

VRC + VCE = VCC, the supply voltage shown as 6V

If VCE could fall to 0 (perfect closed switch) after that the Ic could go no higher than VCC / RC, even along with higher base voltage and current. After that the transistor is said to be saturated. Therefore, values of input voltage can be selected such that the output is either totally off, or totally on. The transistor is acting like a switch, and this kind of operation is general in digital circuits in which only "on" and "off" values are relevant.

Posted Date: 1/10/2013 6:22:06 AM | Location : United States







Related Discussions:- Transistor as a switch, Assignment Help, Ask Question on Transistor as a switch, Get Answer, Expert's Help, Transistor as a switch Discussions

Write discussion on Transistor as a switch
Your posts are moderated
Related Questions
1. The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) 2. At what frequency will the re

Q. Internal Frequency Compensation of operational amplifier? Some op amps, such as the 741, have internal RC networks which are intentionally designed to reduce gain at high fr

When both  MT 2 and  Gate  are positive In this  junction  P 1 N 1   and P 2 N 2   are forward  biased whereas junction N 1 P 2 is reverse biased. The gate current flows  thr

importance of dummy coils and equalizer connections

This project is about another particular application of a particular embodiment of the patent: A Long Stroke Steam Engine using Solar Generated Steam. The machine elements such as

Flow Chart and Cause-Effect Diagram Flow Charts Flow charts are pictorial representations of a procedure. By breaking the procedure down within its constituent steps, f

1) Study the CPLD Design Project Brief to gain an understanding of the project, and the System Specification, Circuit Description, Pre-processing and Post-processing Requirements f

Q. Explain Television signal transmission? Television signals in television signal transmission are the electric signals generated by converting visual images through raster (T

Q. For the circuit of Figure: (a) Find an expression for the power absorbed by the load as a function of RL. (b) Plot the power dissipated by the load as a function of the lo

DCR  Decrement Instruction This instruction  is used to decrement  the contents of any  register or memory  location by one. There are two  formats.