This circuit has an accuracy of 1%. The components used must be precision as well. The input frequency range is 40 Hz to 10 kHz with the indicated components.
This low noise microphone preamplifier circuit was found in American documentation from the 90s....
This high input impedance circuit is suggested by Motorola's 1993 Linear Interface ICs. The power...
This circuit was found in a 1989 documentation. The output must be applied to a power step for...