I found this picture that I had posted to my late, great watsonseblog.blogspot.com. I have added my new rustybolt.info/wordpress blog address to it.
This is a Joule Thief that uses standard parts, including a readily available toroid core. This high permeability core can be wound with various sizes of wire, but about ten turns will give somewhere around 200 microhenrys, which is more than enough for a Joule Thief.
