Based on Radio Shack 276-137, this circuit was found in the December 1995 issue of Electronics Now magazine. The circuit drives an LED but could use a relay instead.
This complex circuit with many digital components measures inductances in 6 ranges ranging from 100...
This circuit was found in old publication from 1958. The circuit uses germanium transistor, common in...
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...