Digital Pingpong Simple Circuit

The IC1 is a flip-flop to supply stable with a stable pulse frequency (the frequency can be changed by TR1, adjust the speed of the LED top and bottom). This frequency is supplying the IC3 (which is a 4-Bit counter UP and DOWN) through two gates of the AB of IC2. Output counter IC4 which supplies the LED driver. CD Section IC2, made the RS flip-flop, that changes the situation, when edge lit LED D1 and D16. We have an electronic limit to change the situation. In proportion to form we make with LEDs, we can have an optional proportional results, making this is a flash efek.Sirkuit double direction. Digital similar to Ping-Pong 1, there is a movement of a bright spot, up and down along the length of the LED. When lit D16 changes the situation and there is a movement backwards. Lit D15-14 D16, lit by a circle when the circuit is under power