The diode was removed across the inductor on the breadboard because compared to vk2zay circuit. With it in place I couldnt generate any change in voltage slope across the shunt R1.

Below are the results. Not seeing a knee up change of slope that indicates saturation but a drop-off instead. Does this drop also provide a saturation indication?

Turns 33

Color Black

V volts 15

kHz 20

t delta t us 3.16

v delta V 0.318

R Resistance 0.47

I Amps I 0.676596

L Inductance 70

Next, I tested an inductor marked 560uH. However, after taking the readings and running the numbers the inductance comes out at 841uH. Did I make an error in the calculation or the readings flawed?

Purchased Inductor 560 uH

V volts 15

kHz 20

t delta t us 23.5

v delta V 0.197

R Resistance 0.47

I Amps I 0.419149

L Inductance 841

L=V/I*t

Im a learning hobbyist, and appreciate any comments.

Thanks,

Boondocker