What is Contactor ?
To start up and shut down a three-phase AC induction motor, any three-pole switch with a suitable current rating will suffice. Simply closing such a switch to send three-phase power...
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Category : Electronic Basics
Electronic Basics
Troubleshooting a Power Supply Circuit
Troubleshooting is the application of logical thinking combined with a thorough knowledge of circuit or system operation to identify and correct a malfunction. A systematic approach to troubleshooting consists of three steps:...
Zener Diode Voltage Regulators
Zener Diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions. By passing a small current through the diode from a voltage...
What is Cathode Ray oscilloscope ?
In studying the various electronic, electrical networks and systems, signals which are functions of time, are often encountered. Such signals may be periodic or non-periodic in nature. The device which...
How to Test a Transistor ?
An individual transistor can be tested either in-circuit or out-of-circuit with a transistor tester. For example, let’s say that an amplifier on a particular printed circuit (PCB) board has malfunctioned. Good troubleshooting...
IEC labelling for Resistors Color Code
The IEC also defines how manufacturers should mark the values of resistors and capacitors in the standard called IEC 60062. The colours used on fixed leaded resistors are shown below:...
Testing a Transistor with a Digital Multimeter
Several faults that can occur in the circuit and the accompanying symptoms are illustrated in Below Figure. Symptoms are shown in terms of measured voltages that are incorrect. If a...
How a Transistor Switch Works
The transistor in Figure is used as a switch to turn the LED on and off. For example, a square wave input voltage with a period of 2 s is applied...
How to Test a Transistor using Multimeter
An ohmmeter can be used to check the state of a transistor i.e., whether the transistor is good or not. We know that base-emitter junction of a transistor is forward...
How to Identify the Transistor Terminals
There are three leads in a transistor viz. collector, emitter and base. When a transistor is to be connected in a circuit, it is necessary to know which terminal is...