I have a Scope plugged to a 100 mH inductor and I observe these weird sinusoidals whenever I touch the circuit with a metal object. The effect is also seen when I poke with my finger but it is less pronounced. There is nothing else apart from the inductor and the scope in the circuit. The frequencies of the sinusoidals are about 83 KHz. I figure this is some kind of resonance so I compute C=36 pf using resonance frequency equation "f = 1/(2pi*sqrt(LC))". That is only my hypothesis but it can't be right. Does anyone have a better theory? The link to my video is right below. http://www.youtube.com/watch?v=mh9eggF4jbA thanks