in wchic we describe the the diac

1. 16/15/2017

2. Introduction
Name
Hamza Sajid 
enrollment no
16-Arid-7
class
BS-IT (3rd sem)
submitted to:
Sir Engr M Azmatullah
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3. DIAC::--
It means that Diode alternating
current
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4. Definition:-  
 A semiconductor device with two terminals,
typically allowing the flow of current both
direction .it can be switch from ON state to
OFF state.
 It have two electrodes (an anode and a
cathode).
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5. Structure of DIAC:-  
There are fallowing types of DIAC
according to layers:-
npn
npnpn
Symbol of DIAC:-
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6. Circuit diagram:-  
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7. Working of DIAC:-  
 DIAC operates in both forward and positive polarities. And
DIAC is essentially a diode that conducts after a ‘break-
over’ voltage is exceeded. Until the device exceeds the
break-over voltage, the resistance of it is very high. When
it exceeds the break-over voltage, it enters the region of
negative dynamic resistance. As a result, a decrease in
the voltage drop across the diode takes place with
increasing voltage and a sharp increase in the level of
current conducted by the device takes place.
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8. Graphical representation of DIAC:-  
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9. Application of DIAC:-  
It can be used in the lamp dimmer
circuit.
It is used in the heat control circuit.
It is used in the speed control of a
universal motor.
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