This circuit was obtained from a National Semiconductor manual from the 1990s. The circuit employs a pair of matched transistors, and the indicator is analog.
The circuit presented uses Linear Technology Operationals, having been found in a 1993 manual. The...
The amplitude of the output signal of this amplifier is proportional to the hub of the input...
Using the 709 integrated circuit, one of the first operational, this circuit was found in the...