Circuit design to input voltages into phone headphone jack

hi, i am an electrical engineer. i have expertise in embedded system design.i can help you with this project. Please check my profile for my previous work experiences. let me know if you are interested in the bid so More

Hi, I am an Electrical Engineer practicing for last 6 years in an R&D Organization. I have designed a number of products ranging from RF & Microwave circuits to digital circuits. i have experience in designing filte More

Hi, my idea would be to take the piezoelectric sensor signal and convert that into a 1KHz sine wave (approx). This sine wave would then vary in amplitude in direct proportion to the strength of the sensor signal ( but More

Hi, My name is Stefan, and I work at a company as a power electronics application engineer. I appreciate communication when working as a freelancer, and I want to assure you that I will respond to your questions / More

It seems to be an interesting project because it will involve some R&D work. Some amplification factor is needed in order to lift the voltage level of the signal from piezo sensor so that the phone can read the values More

Hi! We can do this project. Can you give us more information about your piezoelectric sensor (pdf)? If you interested please contact us. Best regards, Aleksandr.

Dear Sir. I can design such a device to you. As a result you will get: 1) schematic in the Altium and PDF formats; 2) pcb in the Altium format; 3) pcb in the Germer format (ready for production) 4) Bill of materi More

Hi, I read your interesting bid. I have done two projects using audio Android smartphone for input-output. The project also included the creation schematic and PCB. I am an expert in the field of piezoelectric sensors More

hi... i can design your circuit easily on Altium Designer, PCB file,schematic file. plz can you say me your phone model and which program do you use.. thanks..

Hello, I am electronics engineer working with multinational Company. I am having 3 Years of work experience with wireless sensor network, Telecom Networks, Video camera etc. I am expertise on orcad 16.3 for schemati More

Hi, what you yourself feel happy to pay ? you tell me. i just want to work. I will take what you will be happy to pay. Dont fear, this xxx $ is just a filling of position. I can design many circuits. but here i More

HI, I have done similar projects in the past. I will like to use my experience to serve you better. You can trust my sincere indulgence both in quality and time frame. If you will give me a chance, I will ensure that y More

Hi there. My name is Dale and I am based in Melbourne Australia. I assume when you say input via headphone jack you mean a headphone jack that also has a microphone input such as on an iPhone yes? I have over 15 More

Greetings I'm senior EE with over a decade experience in the electronics industry. I was intrigued by your project and the challenges it presents, It seems like a fun little project to work on. The interesting More

I had been working on Piezoelectric sensors. It will be an easy project for me. If u need to see my work before hiring me let me know.I had been working with this sort of stuff. It will be an easy project for me. For More

I have a great and long experience in electronics (almost 35 years) including designing analogue and digital circuitry, programming in C AVR and PIC micro-controllers, simulating electronic circuits with simulating pro More

Hi, We would like to work with you. The following is our brief introduction. If you have any questions, please let us know. A team of professionals in Hong Kong with more than 10 years of experience in embedded s More

Hi wpost123 I went through your requirements, and I am confident that I can achieve the requirements with in your budget and schedule. I would love to work for your project. I am a professional product designer and More

A proposal has not yet been provided

Hi! I have background in circuit design and microcontroller programming and I can deliver this project on time. I have a mini lab at home, with all necessary equipment for circuit prototyping and verification(solderin More