Devising a Circuit with SCR Controlled by Agilent Vee

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tanky322
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This really isn't a homework problem, but it is somewhat. Please move it if you see fit.

I need to devise a circuit with an scr in it, to be controlled using Agilent Vee.

Unfortunatley my teacher isn't the best, and I am not completely sure on the properties of SCR's.

I understand that at a particular voltage and current the SCR will "fire". Does this just mean that it turns on when that voltage is applied? Which would make it cut out all of the negative wave lengths on an AC circuit?

In the attached picture it shows the positive wave being altered, does this happen as you increase the voltage applied to the gate?

Ive been scouring the internet and I am still lost!
 

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Ive read that a bunch of times, maybe something just isn't clicking. I still don't understand how to produce what's in the picture.