GR581 Overview
The GR581 is a level-sensitive, adaptive highpass filter prised of a current controlled highpass filter, a half- wave rectifier, a voltage regulator for microphone bias and a separate preamplifier. The internal rectifier senses the long term average signal level and controls the filter response by setting the control current of the filter. The rectifier sensitivity, with respect to the input signal, can be increased...
GR581 Key Features
- unity gain 12 dB/oct. highpass Butterworth filter
- adaptive frequency range from 200 Hz to 2 kHz
- rectifier threshold set to 82 dBSPL (adjustable)
- low noise, typically 2.6 µV
- 300 µA typical current drain
- operates from 1.1 to 3 VDC
- 10 pin MICROpac
- 10 pin PLID®
- Chip (73 x 59 mils)