silicon controlled rectifier

[abhishek gupta]

hi to all
i want to know that can we add more n and p junctions in pnpn transistor,if not then why?

can we make two bases in pnpn transistor?

 

[Ughadoo]

can we add more n and p junctions in pnpn transistor,if not then why?can we make two bases in pnpn transistor?

A PNPN device is a SCR thyristor, as the title says;

 

[prateeksikka]

why do u need to add?
i visualize SCR as nothing but a controlled transistor and transistor as nothing but a controlled diode ....