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The 4KFM Audio Filter - LDG Electronics
https://ldgelectronics.com/wp-content/uploads/2019/09/CQ-4KFM_-Kincaid.pdf
Enjoy wideband audio on your analog FM repeater with this simple-to-build op-amp filter system! The 4KFM Audio Filter BY DWAYNE KINCAID,* WD8OYG Figure 1. Block diagram of the audio filter. Photo A. The circuit board for the filter is tiny — just 1 by 2 inches. Receiver Discriminator 50 to 5000 Hz, 1V p-p Receiver Discriminator 50 to 5000 Hz ...
Spectrum Intelligent Filter User Guide - Source Audio Website
https://www.sourceaudio.net/uploads/1/1/5/1/115104065/sa248_spectrum_intelligent_filter_user_guide__002_.pdf
The Source Audio Spectrum Intelligent Filter is the most powerful stereo filter effect pedal ever created. Building on almost 15 years of filter pedal technology and know-how, Spectrum is the culmination of Source Audio’s top envelope sounds and their best thinking on how to deliver those sounds to any rig.
AUDIO SPECTRUM ANALYZER DSPIC30F6012 MCP6022
https://circuit-diagramz.com/audio-spectrum-analyzer-dspic30f6012-mcp6022/
A quad of the MCP6022 op-amps for anti-aliasing filtering and gain. Digital signal processing, Fast Fourier transform, frequency spectrum, Hamming window, real-time and frequency response. The Digital, real-time Audio Spectrum Analyzer. It is an analog audio signal as input. It uses a DSP. It computes the distribution of the audio signal.
DX Audio Filter Circuit - ElectroSchematics.com
https://www.electroschematics.com/dx-audio-filter/
The state variable filter is composed of the opamps A2, A3 and A4. The potentiometer adjusts the bandwidth of the filter. The potentiometer P2 adjusts the center frequency of the filter from about 200 Hz up to 2 kHz. By setting these two potentiometers correctly, it is possible to filter out a certain frequency band from the entire audio spectrum.
Simple Audio Spectrum Analyzer Circuit - Homemade …
https://www.homemade-circuits.com/simple-audio-spectrum-analyzer-circuit/
You can make 3 of these or may be 30 of these, just arrange them serially, adjust the pots as per the required specs and see the LED bars dazzle in a up/down motion producing a stunning audio spectrum graphic analysis. Circuit Diagram Parts List for the op amp stage R1, R2, R3, R6 = 10k 1/4 watt 5% C1 = 100uF/25V C2 = 4.7uF/25V C3, C4 = 33nF/50V
Texas Instruments Incorporated Amplifiers: Op Amps …
https://www.ti.com/sc/docs/apps/msp/journal/nov2000/nov_08.pdf
An audio circuit collection, Part 1 Introduction This is the first of two articles on audio circuits. New oper-ational amplifiers from Texas Instruments have excellent audio performance and can be used in high-performance applications. There have been many collections of op amp audio circuits in the past, but all of them focus on split-supply ...
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