This circuit was obtained in an American publication of the time. Transistors are commonly used. The circuit can be adapted for use as a shield.
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...