Using a standard multimeter, this circuit from a 73 magazine for radio amateurs provides an output proportional to the inductance under test. The circuit is TTL and must be powered with 5 V.
This circuit was found in a Poptronics of the 90's. The components can be changed to the desired...
This version of a call-fish is from 1981 using, for this reason, a 90 V battery that is no longer...
Found in a 1969’s Electronic Design, this circuit operates in a narrow range of voltages....