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MSRAAF - Resistor Programmable Active Audio Filter
https://mix-sig.com/index.php/msraaf-resistor-programmable-active-audio-filter
The resistor programmable continuous audio active filter IC is a CMOS chip that can be configured for either a lowpass, bandpass, highpass, allpass or notch filter. Butterworth, Bessel, elliptic and Chebyshev filters can be implemented. The frequency range covers the audio spectrum to 20 kHz. There is a low power version with a frequency range to 5kHz.
Audio Filters: Designing an audio equalizer – Part 7
https://www.engineersgarage.com/audio-filters-designing-an-audio-equalizer-7-8/
The band-pass filter separates the mid-frequency elements (from 500 Hz to 1.5 kHz) and passes them onto the power amplifier with a voltage gain of two. All of the frequency elements are, then, combined at the LM386’s input and amplified by 20 due to the IC’s programmed set gain of 26 dB.
Do narrow-band single-chip bandpass filters for audio ...
https://electronics.stackexchange.com/questions/237766/do-narrow-band-single-chip-bandpass-filters-for-audio-frequencies-exist
You can build a pretty good narrow bandpass filter from a typical quad op-amp package and some resistors and capacitors. If you want to use fewer components than that, you could look at one of the specialised filter ICs on the market, such as TI's UAF42. Opamps will probably work out cheaper though. The requirement for binary output might be harder.
Op Amp Bandpass Filter Design » Electronics Notes
https://www.electronics-notes.com/articles/analogue_circuits/operational-amplifier-op-amp/bandpass-active-filter-design.php
The op amp bandpass filter can be created using a relatively small number of components and gives a good level of performance for many applications. Although when using a single op amp, the bandpass filter performance is a little limited, further stages or more complex topologies can be used if required. What is a bandpass filter. As the name implies a bandpass filter is one …
UAF42 data sheet, product information and support | …
https://www.ti.com/product/UAF42
The UAF42 is a universal active filter that can be configured for a wide range of low-pass, high-pass, and band-pass filters. It uses a classic state-variable analog architecture with an inverting amplifier and two integrators. The integrators include on-chip 1000pF capacitors trimmed to 0.5%.
How to Build a Passive Bandpass Filter Circuit
http://www.learningaboutelectronics.com/Articles/Passive-bandpass-filter-circuit.php
The high-pass filter design creates the lower cutoff frequency point. In the circuit, we want the lower cutoff frequency point to be 1KHz. Therefore, the high-pass filter passes all frequencies above 1KHz. The formula for calculating the lower cutoff frequency is, frequency= 1/2πR1C1= 1/2π (150Ω) (1μF)= 1061 Hz≈ 1KHz.
Wiring Manual NEScaf
https://www.newenglandqrp.org/wp-content/uploads/2017/06/NEScaf_201107.pdf
chip. The NEScaf will take the audio from any source (rig) and filter it to suit your listening…which is called a bandpass filter. The filter has two controls: 1. the center frequency control allows the user to raise or lower the received frequency (the CW note) in the bandpass filter.
Using M68HC16 Digital Signal Processing To Build …
https://www.nxp.com/docs/en/application-note/AN1233.pdf
The MAX274 is an eighth order, programmable, continuous-time active filter. The chip consists of four in-dependent cascadable second-order filter sections. Each filter section can implement any all-pole bandpass or lowpass filter, characterized as a Butterworth, Bessel, or Chebyshev response. Each second-order sec-
MAX275 4th- and 8th-Order, Continuous-Time Active …
https://www.maximintegrated.com/en/products/analog/analog-filters/MAX275.html
Each section can implement any all-pole bandpass or lowpass filter response, such as Butterworth, Bessel, Chebyshev, and is programmed by four external resistors. The MAX274/MAX275 provide lower noise that switched-capacitor filters, as well as superior dynamic performance—both due to the continuous-time design.
Analog Filters | Maxim Integrated
https://www.maximintegrated.com/en/products/analog/analog-filters.html
50:1 (MAX295/MAX296) Low Noise: -70dB THD + Noise (Typ) Operate with a Single +5V Supply or Dual ±5V Supplies. Uncommitted Op Amp for Anti-Aliasing or Clock-Noise Filtering. 8-Pin DIP and SO Packages. Printable Data Sheet. Learn More. MAX295 8th …
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