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Notch Filters / Bandpass Filters

NFBF-1
Tunable Notch Filter / Bandpass Filter

Removes annoying tones from receive audio path (notch filter). Passes desired tone while rejecting others (bandpass filter).

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Tunable Notch Filter / Bandpass Filter

NFBF-10
600 OHM Balanced Line Audio Amplifier with Tunable Notch Filter / Bandpass Filter / Low-High Pass Filter with AGC

Midian's NFBF-10 is a single channel 600 ohm balanced line audio amplifier with a tunable notch filter and AGC as well as an adjustable gain output stage. It can be used in several ways. It may serve as a simple single channel line audio amplifier, an AGC amplifier, a tunable notch filter, or a combination of these functions. It's most common use it to remove the 2175 Hz tone remote keying tone from voice recording systems and 1950 Hz Pilot Tone from voting systems. A high pass, low pass, bandpass filter can be effected through the use of jumpers.

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600 OHM Balanced Line Audio Amplifier with Tunable Notch Filter / Bandpass Filter / Low-High Pass Filter with AGC