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 has its application suggested in an alarm system. The circuit is from an old RCA...
Found in a 1967 RCA manual, this circuit uses components from the era that can be replaced by modern...
This circuit for voltages up to about 20 V was found in a 90s Popular Electronics. The LED can be...