EPAS 4

• DISCIPLINE • GOOD TASTE • EXCELLENCE
• Department of Education, National Capital Region, SCHOOLS DIVISION OFFICE, MARIKINA CITY
• TLE – Industrial Arts, Electronics Product Assembly and Servicing, First Quarter-Module 4 Lesson 4, Perform Electronic Products Assembly
• Writers

  Rudy B. Anterior
• Cover Illustrator


  Christopher E. Mercado
• City of Good Character
• This module was designed and written to help you master the essential knowledge to prepare and to assemble the electronics component. The scope of this module permits it to be used in many different learning situations. The language used recognizes the diverse vocabulary level students. The lessons are arranged to follow the standard sequence of the course. The level of understanding established in your previous Grade level will be reinforced as included in this lesson and by another mode of learning prescribed.
• This lesson introduces the safety measures to prevent an accident when doing electronic works. Identify different hand tools to be used in assembling electronics products and to help you understand to choose the appropriate hand tools to be used in actual electronic works.
• Learning Objectives


  • Follow work instructions based on job order or client requirements
  • Perform assembly procedures following OHS policies and work instructions
  • Connect and/or integrate modules and accessories into the final product based on the client specifications
  • Dispose of excess components and materials based on WEEE directives and 3Rs waste management program
• Words in the grid

  • PCB
  • PLIER
  • LONGNOSE
  • PERFORM
  • PRODUCT
  • LEAD
  • WIRE
  • ASSEMBLY
  • ELECTRONIC
  • SOLDER
• Electronic assemblers


  Prepare and place electronic components within a variety of devices. This role is extensive and familiar with circuit boards and electronic components as well as soldering and other methods of assembling electronics securely so they work as expected.
• Assembly Line used in Electronic Assembler jobs


  • Work on the electronics assembly line, executing assigned tasks assembling a variety of industrial joysticks
  • Warehouse environment in a very fast-paced assembly line refurbishing electronic cash box machines
  • Worked in fast-paced assembly line constructed computer parts with multiple components Quality assurance
• Mechanical Assembly used in Electronic Assembler jobs


  • Performed a variety of electronic and mechanical assembly operations
  • Hand soldering/mechanical assembly and cable harnessing on assembly units
• Preset or variable resistor

  Light-dependent resistor (LDR)
• Light-dependent resistor (LDR)


  As the light fades its resistance increases
• The preset resistor


  Used to adjust the sensitivity of the circuit
• Light Dependent Resistor


  A photo resistor or photocell is a light-controlled variable resistor. Its resistance changes with the light intensity that falls on.
• Characteristics of LDR

  • Resistance decreases when light falls on them and increases in the dark
  • Resistance is very high in the dark, called dark resistance
• Electrode


  An electrical conductor that makes contact with the nonmetallic circuit parts of a circuit
• Cold Weld Contact


  Can ensure fast and strong joins in wires and is commonly used with aluminum
• Wire Terminal


  Any point in the continuous conductive routing where there is a break of connection
• Photo Conductivity


  Increased electrical conductivity caused by the presence of light
• Advantages of LDR

  • Sensitivity is High & Small devices
  • Easily used
  • Inexpensive
  • No union potential
  • Light-dark resistance ratio is high
  • Simple connection
• Disadvantages of LDR

  • Spectral response is narrow
  • Hysteresis effect
  • Temperature stability is low
  • Slow response in stable materials
  • Limited use where light signal changes quickly
  • Not so responsive
  • Provides incorrect result when working temperature alters
• Light sensor


  The LED lights up when the intensity of the reaching the LDR resistor is sufficient
• Automatic emergency lights


  • Senses darkness/night and turns ON automatically. Senses daylight and turns off automatically
• LDR symbol


  Based around the resistor circuit symbol, but shows the light, in the form of arrows shining on it
• Simple LDR Circuit


  To detect light & control the ON-OFF of the system associated with respect to the intensity of light that falls on it
• Light dependent resistor (LDRs)


  Electronic components that are used to detect light & change the operation of a circuit dependent upon the light levels
• Transistor


  An automatic switch that conducts current across the collector-emitter path only when a voltage is applied to the base
• Light dependent switch


  Controls the side and main headlights
• Music light alarm with LDR


  A simple circuit that uses a LDR and a 3.6 V battery or 3 x 1.2 volts rechargeable batteries