clap circuit
http://www.youtube.com/watch?v=matJ9Z_l8y8
Collins lab
http://www.youtube.com/watch?v=S2AHimvbovI
http://www.youtube.com/watch?v=Co9mhYp0anA&feature=rellist&playnext=1&list=PLAE2F9722172026E0
http://www.youtube.com/watch?v=ihoX7x0RBz8&feature=relmfu
http://www.youtube.com/watch?v=qPt0X5s-1JU&feature=relmfu
http://www.youtube.com/watch?v=GPokkuX_jjk&feature=relmfu
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