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Need help designing a active bandpass filter for audio with adjustable center frequency

$10-30 USD

Completed
Posted 10 months ago

$10-30 USD

Paid on delivery
I am looking for a skilled engineer to design an active audio bandpass filter with an adjustable center frequency for my audio processing application. I am just a hobbyist so i need help from an expert :) The ideal candidate should have experience in audio signal processing and filter design. The project requirements are as follows: - Center frequency: 30 Hz - Bandwidth range: Around 10Hz - Application: Audio processing The deliverables should include a circuit diagram and a bill of materials for the filter design. The circuit should be able to adjust the center frequency. The filter should use max two opamps. The center frequency adjustment should be made with a potentiometer. using the potentiometer. How far can i go with the center frequency? 1000Hz? 20.000Hz? I have used a filter design tool which gave me the following schematics. Your job would be to tell me how to make it adjustable.
Project ID: 36698709

About the project

12 proposals
Remote project
Active 10 mos ago

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Listen i have extensive filter knowledge. Your circuit is good, but you will not be able to turn it into something adjustabel unless you want to adjust a lot of potentiometers at the same time. I have a solution for you, it works! Give me this project! i will do it for you! With my experience i can guarantee that you will have success with this project. Thank you for considering me for this job!
$25 USD in 7 days
0.0 (0 reviews)
0.0
0.0
12 freelancers are bidding on average $45 USD for this job
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Hello, I am Muhammad Adeel, an electrical engineer with expertise in audio processing, circuit design and electrical engineering. I have used a filter design tool which gave me the following schematics. I believe that my experience and expertise will be an asset for you as you look to design an active audio bandpass filter with an adjustable center frequency for your audio processing application. My skillset includes audio processing, circuit design and layout which will be necessary to produce the required filters. Additionally I have experience working with Opamps which is necessary for this project as well as the ability to adjust center frequencies up to 1000Hz. I would be delighted to discuss this project further with you if given the opportunity. Please feel free to contact me if you have any questions or would like more information about my skillset or experience.
$100 USD in 7 days
4.8 (36 reviews)
5.6
5.6
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Hi there, i hope you are fine, i can do this for you in a few hours just send me a message please.
$30 USD in 1 day
5.0 (10 reviews)
3.8
3.8
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Hi, and thanks for considering my proposal. I'm an ELECTRICAL ENGINEER, LECTURER, and the freelance professional working at different scales. I have 10+ years of experience completing freelance projects in electrical engineering and electronics. Some related features skills of mine are: ⌂ Electronics (Circuit Design, PCB Layout and Design using Proteus, NI Multisim, KiCAD) ⌂ Control systems and Power Electronics (Using MATLAB/Simulink, PSCAD, DIgSILENT PowerFactory, PLECS) ⌂ Machine Learning (Deep Learning, Neural Networks, Data Science, Statistics) ⌂ MS Office, Research/Academic/Technical Writing WHY DID I APPLY FOR THIS PROJECT? There are the following reasons: - I am skilled with the required skills. I have taught the subject of filter design for about 5 years. - The required filter can be obtained using ORTHOGONAL FILTER DESIGN concepts, and I can do that. PLEASE LOOK INTO PROFILE FOR RELATED PORTFOLIO PROJECTS. Please share the exact details and let me tell you how I can accomplish the job. Please note that BUDGET and TIMINGS are NEGOTIABLE. So, contact me now. Regards Ghulam Shabbir
$120 USD in 5 days
5.0 (6 reviews)
3.4
3.4
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Hello there! My name is Anas, and I'm an electrical engineering specialist with over 5 years of experience in the field. I understand you're looking for a skilled engineer to design an active audio bandpass filter with an adjustable center frequency for your audio processing application. Specifically, you're looking for someone with experience in audio signal processing and filter design who can help you create the perfect filter design. I believe I'm the perfect person for this project! With my extensive knowledge of electrical engineering and audio signal processing, I'm confident that I can deliver an exceptional result that meets all of your requirements. Plus, my commitment to customer service means I'll always go above and beyond to ensure satisfaction - something that's important to you now more than ever. If you'd like to discuss further how I can help you with this project please don't hesitate to reach out to me directly. Otherwise, feel free to check out my profile page above for more information on my skills and previous work.
$30 USD in 2 days
4.7 (6 reviews)
3.3
3.3
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I have previously worked on building underwater passive sonar. where I designed both analog frontend and the digital electronics in FPGA. I can easily work on your project for audio processing. I can do circuit design, Bill of materials, smd compact design, minimal components usage, PCB design and fabrication, write software or firmware and help you with debugging. tuning center frequency to 20khz is totally possible. Lets chat to discuss your expectations in detail.
$86 USD in 14 days
5.0 (2 reviews)
3.2
3.2
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Hello. I am ready to complete your task. I made a similar filter for the subwoofer amplifier channel. Only there was a band adjustment from the top. I can add adjustment from the bottom, you just need to use a dual potentiometer. This can be added to the schema you suggested. Please note that the 4th order filter introduces more phase distortion, I think you know about it. If you want to hire me, I need clarification on the parameters of the signal. input and output levels. And a more detailed discussion of components. Types of capacitors if this is critical for you. OpAmp with low THD... And more. If necessary, as an additional step I can build a prototype and record the frequency response. Thank you.
$25 USD in 7 days
5.0 (1 review)
0.6
0.6
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Hi,I have designed such filters for different types of circuit an example of such is an electronic transducers running at 2mhz ,as you when a transducer recieves an echo pulse one needs to remove all unwanted frequencies in order to recover the origami signal ,I can design an accurate filter for your application I have an electronics engineer with over 10 years in the field and I will provide you all necessary and required files on project completion. Thanks
$25 USD in 2 days
5.0 (1 review)
0.4
0.4
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Dear Client. I have read your " " requirement and I am 100% confident that I can complete your project perfectly. My best skills are PCB design and schematic design using Altium, KiCad, Eagle, Proteus. Here is my past experience. - Multilayer PCB design and flexible board design(Schematic, PCB, BOM) - AC/DC DC/DC converter and power converter, power circuit design - USART, USB, SPI, I2C, RF, RS232, BLE communication module design - Motor control, LED lighting design, camera module design - Artistic shape design of PCB and quick error correction -Robot design, simulation in each circuit ⁃Experience in PCB design verification such as prototyping and practical knowledge of FCC certification - Firmware C/C++ (ARM, Arduino,ESP32, PIC) ... When a project is awarded to me, I will do my best to complete your project. I would like to have a specific discussion with you about the details of the project. regards
$30 USD in 3 days
0.0 (0 reviews)
0.0
0.0
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Dear Client, I am pleased to offer my expertise in audio signal processing and filter design to assist you with your project. As a hobbyist in need of professional guidance, I understand the importance of working with an experienced engineer. I am confident that I can deliver a solution tailored to your requirements. Project Scope: Design an adjustable active audio bandpass filter with the following specifications: Central frequency: 30 Hz Bandwidth range: Approximately 10 Hz Application: Audio processing Deliverables: Circuit Diagram: Detailed schematic of the active audio bandpass filter design. Timeline and Cost: The estimated project timeline is 7 days from the date of approval , covering design, simulation on Proteus software, and report on designing with complete details components used. The total cost for the project, including consultation, circuit diagram, , and email support, is I am confident in my ability to deliver a high-quality adjustable active audio bandpass filter that meets your needs. My expertise in audio signal processing and filter design ensures a tailored solution that aligns with your requirements. I am available to discuss the project further and address any questions or concerns you may have. Thank you for considering my proposal. I look forward to your response. Best regards, Prajakta
$20 USD in 7 days
0.0 (0 reviews)
0.0
0.0

About the client

Flag of GERMANY
Schoellnach, Germany
5.0
13
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Member since Nov 22, 2017

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