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control circuit for driving scr

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Dimpi

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I am making a control circuit for driving back to back 2 SCRs..here is the attached pdf ..please have a look on the schematic..the operation i have understood by seeing the video

[video=youtube;W24V9R15fZ0]http://www.youtube.com/watch?v=&feature=player_detailpage[/video]

what is the use of resistor in it.??what if we dont put the resistor R3 and R4..??n if its required how the value to be decided??
first i thought R3 and R4 as gate current limiting resistor ..but seeing the video i could make out that during positive as well as negative half cycle,the path doesnot pass through resistors..then what is the use of that??

May be its a silly ques to ask but please be patient with me and help me to understand by rplying.

thanx in advance
 

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kam1787

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doesn't make sense to me, either. do you have the rest of the circuit?
 

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