I just put this circuit together on a breadboard tonight, and it works great! I have a real-world stoplight in my game room that currently only lights all 3 bulbs at the same time when you plug it in, and I want to power the switching of the 120VAC bulbs with the circuit. I'm going to use some solid-state relays so I can control the higher AC voltage with low DC voltage. Thanks for posting this circuit and making my project so much easier. I'll post my final product in a week or so when the relays arrive.