Found in a book on transistors from 1954, this circuit increases the sensitivity of a milliammeter, taking it to a full scale of just 25 uA. The circuit can be adapted for use with modern transistors.

Found in a book on transistors from 1954, this circuit increases the sensitivity of a milliammeter, taking it to a full scale of just 25 uA. The circuit can be adapted for use with modern transistors.