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what are these transistors for?

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xjackal

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hello in my design i need a triggering for the pulse transformers in my circuit to control the phase of thyristors.but i cant figure these two cascade transistors functioning for?can it be the zero-crossing but the base current is comming after the bridge has rectified it.so im confused?



 

The bridge has only rectified but it's output will still ha the positive half cycles from which the zero crossing can be detected.
 

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