It's right he

http://circuitsalad.com/2012/09/30/a...erative-radio/

I built it using J310s and it works extremely well. It's simple and doesn't take long to build if you have the parts.

And check out the rest of this guy's site. Ray Ring is the author's name. Tons of neat circuits available and Ring's commentary is always interesting. This site is a gold mine.