A D Flip Flop made up of 2 NAND gates, 2 NOR gates, and 1 inverter. The D Flip Flop uses two inputs -- DATA and CLOCK -- represented by a logic source and a logic train that acts as the CLOCK pulse.
It outputs Q (represented by the top green LED) and invert of Q (represented by the bottom red LED).
It won't transmit unless there is a CLOCK pulse in which case it'll transmit either a 0 or a 1 depending on the logic source state. I have set up a switch to enable/disable the CLOCK pulse.