Salvage some inductors out of a computer, but they're not marked, is there an easy way to determine what their rating is?
Thanks
Kinarfi
You could build an RL oscillator using the 7555 timer, use a frequency counter or oscilloscope to determine the output frequency and calculate the inductor value.
See the following thread.
https://www.electro-tech-online.com/threads/interesting-7555-circuit.31653/