AC wave This shows all the possibilities of rectification. !mage 1 waveform Image 2 half wave. Image 5 full wave. Image 6 residual ripple. Image 9 after capacitor smoothing. Both can be applied either way up, leaving numerous possibilities for your original picture. PS, the picture was a funny way of showing a diode half wave rectifying in both directions. It is used to teach the functions of semiconductors to young students.