2 nd session of R&A
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Transcript of 2 nd session of R&A
![Page 1: 2 nd session of R&A](https://reader035.fdocuments.in/reader035/viewer/2022062721/5681379e550346895d9f4413/html5/thumbnails/1.jpg)
2nd session of R&A Transistors & couplers
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Agenda
• Transistors as switch.• Transistor testing.• Opt couplers.• Relays.• Simulation with Proteus 7
professional program.
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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 !!!!
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Transistor OFF state
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Transistor ON state
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Transistor testing
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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.
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)AC/DC (Isolation
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DC/DC Converter
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6 Pins Package
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8 Pins Package
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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).
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Simple circuit
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Relays -5 Pins
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(DPDT) Relays -8 Pins
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Controlling Motor Direction
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Question!!!!!???
• When you will use Relay instead of Opt coupler in your application and vise versa??!!!
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SimulationProteus 7 Program
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Thank you
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Introduced by• Eng. Mustafa Ahmed Hemdan.• Chairman of Robotics &Automation Chapter• Communications & Electronics department.• E-mail: [email protected]• Mob: +20173220460
• Our blog : • http://rastsc.wordpress.com• Our group on facebook :• Robotics & Automation Chapter