The strobe circuit is a fun device I built in my free time. My goal was to create a system which would pulse a light to the bass of a song. This was accomplished by modifying a typical extension cord to have a second order low pass filter circuit in one of its lines. Audio is streamed through the circuit via the two 3mm jacks, allowing the power from the wall to pass when the audio is below the cutoff frequency. The result is a device capable of turning any wall powered lamp into a strobe light for all your favorite songs.