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2 nd session of R&A. Transistors & couplers. Agenda. Transistors as switch. Transistor testing. Opt couplers. Relays. Simulation with Proteus 7 professional program. Transistor working theory. Consist of two diodes back to back.

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2 nd session of r a

2nd session of R&A

Transistors & couplers

agenda
Agenda
  • Transistors as switch.
  • Transistor testing.
  • Opt couplers.
  • Relays.
  • Simulation with Proteus 7 professional program.
transistor working theory
Transistor working theory
  • Consist of two diodes back to back.
  • By controlling states of the two diodes , we can control the switching of the transistor (ON-Off).
  • Look at this program to get the idea !!!!
opt couplers
Opt Couplers
  • Opt couplers make an isolation between interfaces of two circuits.
  • typically consist of a gallium arsenide

LED (light-emitting diode) and an optical receiver such

As phototransistor or light-triggered diac . The two are

separated by a transparent barrier which blocks any

electrical current flow between the two, but does allow

The passage of light.

relays
Relays
  • An electromechanical or solid-state device operated by variations in the input which, in turn, operate or control other devices connected to the output. They are used in a wide variety of applications throughout industry, such as in telephone exchanges, digital computers, motor and sequencing controls, and automation systems.
  • Bins configuration (No,Nc,C,Coil).
question
Question ???!!!!!
  • When you will use Relay instead of Opt coupler in your application and vise versa??!!!
simulation

Simulation

Proteus 7 Program

introduced by
Introduced by
  • Eng. Mustafa Ahmed Hemdan.
  • Chairman of Robotics &Automation Chapter
  • Communications & Electronics department.
  • E-mail: hemdan@ieee.org
  • Mob: +20173220460
  • Our blog :
  • http://rastsc.wordpress.com
  • Our group on facebook :
  • Robotics & Automation Chapter
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