This circuit passes frequencies within the 300Hz - three.1kHz range, as present in human speech. The circuit consists of cascaded high-pass and low-pass filters, which collectively form a whole band-pass filter. One 1 of 2 of a TL072 twin op amp (IC1a) along with two capacitors and two resistors make up a 2d-order Sallen-Key high-pass filter. With the values shown, the cut-off frequency (3dB point) is round 300Hz. As the op amp is powered from a single provide rail, two 10kO resistors and a 10µF decoupling capacitor are used to bias the enter (pin 5) to one-half supply rail voltage.
Circuit diagram:
Voice Bandwidth Filter Circuit DiagramThe output of IC1a is fed into the 2d 1 of 2 of the op amp (IC1b), also configured as a Sallen-Key filter. However, this time a low-pass perform is carried out, with a cut-off frequency of about three.1kHz. The filter component values had been chosen for Butterworth response traits, providing maximum pass-band flatness. Overall voltage acquire within the pass-band is solidarity (0dB), with maximum input sign stage earlier than clipping being roughly three.5V RMS. The 560O resistor at IC1bs output gives short-circuit protection.
Author: M. Sharp
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