Cheap and easy inductance tester uses few components
This circuit plus a frequency counter or oscilloscope measures unmarked inductors.
Al Dutcher, Consulting Engineer, Paulsboro, NJ; Edited by Charles H Small and Brad Thompson -- EDN, 4/12/2007
This circuit plus a frequency counter or oscilloscope measures unmarked inductors.
Al Dutcher, Consulting Engineer, Paulsboro, NJ; Edited by Charles H Small and Brad Thompson -- EDN, 4/12/2007
In the absence of expensive test equipment, the circuit in Figure 1 offers a simple and rapid alternative method of measuring inductance. Its applications include verifying that an inductor's value falls close to its design parameters and characterizing magnetic cores of unknown parameters that accumulate in the "junk box." As designed, the circuit tests most inductors for use in power supplies and many inductors for RF circuits.