This is a circuit converted from BCD to 3 excess converter.
The circuit implemented in this project shows light moving in a counter-clockwise direction on a Seven Segment Display (SSD). The given order of states is as follows: a->fa->f->ef->e->de->d->cd->c->bc->b->ab->a.
Decodes 4-bits into 0-F. Has a counter to cycle through each number with a binary display and a power button to control whether the display and counter are on or off.