Transistor Emitter Bias
August 14, 2016
Emitter bias provides excellent bias stability in spite of changes in β or temperature. It uses both a positive and a...
Read more
Transistor Voltage Divider Bias
August 14, 2016
A method of biasing a transistor for linear operation using a single-source resistive voltage divider. This is the most widely used...
Read more
Testing a Transistor with a Digital Multimeter
August 14, 2016
Several faults that can occur in the circuit and the accompanying symptoms are illustrated in Below Figure. Symptoms are shown...
Read more
Troubleshooting a Biased Transistor
August 14, 2016
Several faults can occur in a simple transistor bias circuit. Possible faults are open bias resistors, open or resistive connections,...
Read more
Optocouplers Working Principle
August 13, 2016
What is optocoupler? An optocoupler is an optical link and it connects two circuits via this link. The optical link...
Read more
Phototransistor Circuit Example
August 13, 2016
Phototransistors are used in a variety of applications. A light-operated relay circuit is shown in below Figure (a). The phototransistor Q1...
Read more
Phototransistor Working Principle
August 13, 2016
A phototransistor is similar to a regular BJT except that the base current is produced and controlled by light instead of...
Read more
Basic Transistor Amplifier Circuit Principle
August 13, 2016
A transistor amplifies current because the collector current is equal to the base current multiplied by the current gain, b. The base...
Read more
Transistor Collector Characteristic Curves
August 13, 2016
Using a circuit like that shown in Figure (a), a set of collector characteristic curves can be generated that show how...
Read more
Why Silicon is preferred over Germanium ?
August 13, 2016
As we all know, both Silicon and Germanium are semiconductor devices. But the present trend is to use Silicon instead...
Read more
