I think this might be another solution, using the capacitance of the diode to make a resonator and then driving near resonance. Here V(n001) is some pin voltage

I think this might be another solution, using the capacitance of the diode to make a resonator and then driving near resonance. Here V(n001) is some pin voltage and V(n002) is the voltage across the diode: http://imgur.com/a/xwZF4 http://imgur.com/a/xwZF4