/diy/ - Do It Yourself

>>1765807
I sorted this out. The diode was not the issue. It was due to the high DC resistance of the inductance being measured. Diode or not, can't measure the time constant accurately if R_l is too high compared to R. So I increased the R value and that did that trick. 1:10 should be good enough.

Now I am getting a fairly accurate result on the output of the comparator. Except I am getting a second pulse since the voltage across R spikes above 5V. Damn. Can try a schottky across the L.