Thursday, June 24, 2010

SMT Resistor

Step by step Cellphone repair tutorial - Basic to Advance - Topic 02

Resistor
A resistor is a two-terminal electrical or electronic component that opposes an electric current by producing a voltage drop between its terminals in proportion to the current, that is, in accordance with Ohm's law: V = IR. The electrical resistance R is equal to the voltage drop V across the resistor divided by the current I through the resistor. Resistors are used as part of electrical networks and electronic circuits.

Surface mount technology (SMT) is a method for constructing electronic circuits in which the components (SMC, or Surface Mounted Components) are mounted directly onto the surface of printed circuit boards (PCBs). Electronic devices so made are called surface mount devices or SMDs
You can refer only its value by an aide of Schematic Diagram Available for that certain products. Or you can Identify and check its value by using Resistance Tester...

Unmarked value
Printed value



The SDM Resistor

Surface mount resistors are typically been comprised of a flat rectangular resistive metal strip with high conductivity metal terminals welded to the ends of the resistive metal strip to form the electrical termination points.
A protective coating is then applied over the resistive material to provide protection from various environments to which the resistor may be exposed as well as providing strength to the resistor.

There are two types of surface mount resistors used in an electronic circuit board-the 3-digit and 4-digit code SMD. The first two digits represent the two digits in the answer. The third digit represents the number of zero's you must place after the two digits. The answer will be in Ohms. For example: 104 which mean 10 0000 (4 zero's) and the final answer is 100k. Let's calculate the 4 digit SMD, 1182 which mean 118 00 (2 zero's) and the final answer is 11.8k.

The answer will be in Ohms. For example: 104 which mean 10 0000 (4 zero’s) and the final answer is 100k. Let’s calculate the 4 digit SMD, 1182 which mean 118 00 (2 zero’s) and the final answer is 11.8k.

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