I am looking to make a Sodering Iron Temp control that uses a transistor.let me know if you know of any diagrams.

thanks
Mike

 

If an SCR isn't too big a disapointment (soldering irons are AC powered), try this - http://members.shaw.ca/roma/iron.html. Google is your friend.

 

An SCR would only allow half of the AC through.

Here is a schematic for one of the crap Wellers http://www.uoguelph.ca/~antoon/circ/wlc100.html