what happend if I replace the diode D1 by the SCR to control

[/img] http://services.eng.uts.edu.au/~venkat/pe_html/ch03s2/fwdiscr1.gif

How to calculate the commutation u.thanks

 

Sorry friend, your link does not work.

[ed]

 

the circuit in this link
http://services.eng.uts.edu.au/~venkat/pe_html/ch03s2/fwdiscr1.gif

 

google brought this up:

http://services.eng.uts.edu.au/~venkat/pe_html/ch03s2/ch03s2p1.htm

and here is the image:

 

yes, you can help me ?