Simple walker

This is the simple and compact circuit that can make walking pattern :P the speed can be changed by reducing the millisecond in sequencer to go faster or adding to go slow (both sequencer must have same timer or it won't walk synchronized)

Updated: added reverse ~ but but smooth reverse in first step backwards, tried to make it simple but frequencies were interfering.

On circuit board, black beam is layer one servos and white is layer two servos