Multistage transistor amplifier trabalhos
As manufacturer/ reseller, I'm requiring the design of schematics for a custom analogue audio mixing board. Also to be designed is a portable headphone amplifier that will work in conjunction with the mixer. Also, there is the possibility of taking the next step of designing the PCB boards. The design concept and design details are complete. Now needed are the next steps in electronics design to be forwarded to the manufacturing facility. Ideally, I'd like to work with a freelancer who has a strong background in audio technology and experience in creating analogue audio solutions. Your past projects and proven track record in this domain will be critical for me to make my selection. Looking forward to working with someone passionate about music and music gear!
I am seeking an expert who can identify an IEEE paper relevant to po...who can identify an IEEE paper relevant to power amplifiers or low noise amplifiers, and imitate the same using LTSpice. Requirements include: - Delving into the specifics of the design methodology, performance metrics and simulation results presented in the chosen paper - No particular preferences when it comes to designing the amplifier as per classes or types - Validating the results post simulation - Presenting various matrices such as z, h, y for the amplifier under consideration Ideal candidates should possess: - Detailed knowledge about different classes and types of amplifiers - Proficiency in using LTSpice for simulation purposes - Ability to understand and interpret complex matrices associate...
...Converter) Board. This board will be specifically for audio playback, converting digital signals into analog audio. The ideal freelancer for the project will be proficient with the following: - Designing and building DAC boards - Knowledge of audio playback technology, specifically analog - Power supply design for battery-operated devices Your task will be to create a prototype streaming DAC amplifier board that operates on battery power and successfully converts digital signals into quality analog audio. Proficiency in circuit design, audio technology, and sustainable power supply integration will be critical to fulfilling this role successfully. Previous experience with DAC design and an understanding of audio signal transmission will be highly beneficial. Qualifications: ...
...streaming DAC amplifier board that operates on battery power and successfully converts digital signals into quality analog audio. Proficiency in circuit design, audio technology, and sustainable power supply integration will be critical to fulfilling this role successfully. Previous experience with DAC design and an understanding of audio signal transmission will be highly beneficial. Qualifications: -must know Xcode -design with LTSpice, MATLAB, Vivaldi -must have Distortion Analyzer, frequency sweeps -software/hardware/MPU programming skills -be able to build a prototype board totally functional -compile code -Simulate Analog / Digital signals Regarding hardware -Arm with Wi-Fi only -Recover 44.1 khz clock using 22.5792 MHz oscillator -DAC (to be discussed) -3w Class A push p...
I am looking for a freelancer to develop a dedicated purpose audio app using a Teensy 4.1 microcontroller. The app will play files from a preloaded SD Card to Teensy to Audio Codec to Audio Amp to a Speaker (10 w). Desired Output: - The main function of the app is playback. User Interface: - The audio app will have a user interface that utilizes 3-gang starswitch for selections (000-199). Three switches: START, PAUSE (Looong selections require this),END (selection). Analog VOL control, Lo to Hi Power: Wall plug-in: 110V AC to 12V DC, 1 Amp Audio File Format: - The preferred format for the audio files is not specified, as the app should be able to play various formats such as MP3 and WAV. Skills and Experience: - Experience with Teensy microcontrollers and audio codecs. - Proficiency...
...am looking at using the Nichia NUBM44 but open to other suggestions. Will obviously also use a heatsink +fan for cooling. The circuit should consist of three inputs, +VCC, GND and the PWM signal. pick your own values for source voltage and input signal but try to stick to standard numbers. I basically just need the diode to be controlled by the PWM signal, that's not hard to do with an NPN transistor and a current limiting resistor. Though I would also like something to make sure there is a constant stable current being fed to the diode, this is all about making sure the diode won't be damaged. Include the fan as a component if you can. So for example when the diode is on the fan MUST be on at the same time and maybe also have a cool down period so when the diode tur...
Hello,I am looking for experienced RF designer to design RF PCB consisting of an Zynq FPGA and an rf transceiver chipset (will be revealed via chat). The design consist of GPS ,wifi module, display ,keypad and power amplifier which the freelancer should select and make the design in preferable 6/8 layer design also requires impedance matching. More details via chat.
RF pre-amplifier simulation (experienced RF engineers only please!) I am looking for a freelancer who can design and simulate with SPICE an RF pre-amplifier with 22 dB gain. The specific frequency range I am targeting is from 300 KHz to 500 MHz. Skills and experience required: - Able to show they can simulate a simple 1 transistor amplifier in SPICE (pre-selection test) - Proficiency in RF circuit design and simulation - Experience with high gain RF pre-amplifiers - Knowledge of impedance matching techniques - Familiarity with simulation software such as SPICE, ADS or CST - Ability to analyze and optimize amplifier performance If you have experience in RF circuit design and simulation and can meet the specific requirements of this project, please submi...
I would like to create the option to open and start the vehicle while our customers have their keys in a secure place within our garage
Codium is a French company comprising an electronics design office (which designs electronic boards for customers) and an electronic board production unit. We assemble our customers' boards. Our current logo (attached) is cold and difficult for our custo...boards. Our current logo (attached) is cold and difficult for our customers to understand, and not very stylish, despite the fact that our company is young and dynamic. We want to give it a facelift. We want to use the same base, the same identity, but give it a young, dynamic and warmer touch. The brackets in the current logo refer to computer code, and the symbol corresponds to that of a transistor, the basis of all electronic circuits. The logo can be redesigned with a curved line or other technique, while retaining...
Dear Dave W As a seasoned electronics engineer with expertise in designing and implementing transistor circuits, I am excited to offer my services in developing a simple circuit that can be used to light an LED with a 1.3V base voltage and a 9V collector-emitter voltage. I am confident that I can design a circuit that meets your specific needs and requirements. I will work closely with you to understand your application and ensure that the circuit is safe and reliable.
Smallest circular footprint possible, suitable track thickness for 12v, include locations of components including resistor specifics. Components Rechargeable 12v (or 6v x2 in interest of reducing footprint). 3.7g micro servo x2 3.7v dc motor x2 Esp32 cam 1.3 inch color screen 3 microphones Distance sensor Motion sensor Photo Transistor Usb c port for charging and data upload with respective voltage/ charge protection.
...analogue circuit design. - Experience in creating voltage alarms. - Proficiency in selecting appropriate components for battery-powered devices. - Familiarity with voltage monitoring and detection systems. - Ability to design a compact and efficient circuit that meets the specified voltage range and functionality requirements. This is the alarm system for my patent The problem: I have a 50 watt amplifier that creates a parasitic oscillation that needs to be measured. The oscillation can be measured on a Computer based spectrum analyzer.( Tru RTA ) . The power output is 1.4 V and 0.8mv. This is essentially a microphone level signal Most analogue signals need a line level signal to work ( 1-3V 10-30ma) I have fed through various preamps and can get the signal to 9v and 4ma which...
I am seeking a freelancer who can assist me with the implementation of an operational amplifier (op-amp) for the measurement of beam bending in load testing. The project requires the following skills and experience: - Strong knowledge and experience in designing and implementing operational amplifiers with high gain and low noise - Familiarity with load testing and the ability to accurately measure beam bending - Proficiency in creating working prototypes to demonstrate the functionality of the operational amplifier - Attention to detail and the ability to provide accurate measurements and data analysis Description: An apparatus consisting of a resistive strain gauge, step-motor, Arduino and a few other electronics on a breadboard is set up. The apparatus is required for ap...
I am looking for a skilled freelancer who can assist me with double-checking a small and simple PCB and its components. The project involves verifying the functionality and accuracy of the PCB and ensuring that all standard components are correctly installed. The board has the function to interface with a Raspberry Pi to: Drive 4x 12V pump through transistor Drive 4x LED (various status and indicators) Drive 4x Sensors Skills and Experience: - Experience in PCB design and verification - Proficiency in verifying the functionality of standard components - Attention to detail to identify any potential issues or errors - Knowledge of best practices in PCB verification and testing The ideal freelancer should have a strong background in PCB design and verification, with a focus on sm...
I am looking for an experienced PCB designer to check and improve a small-sized PCB (less than 10cm x 10cm). The main function of the PCB is to a control system a set (4) of pumps and receive input signals. It has worked flawlessly previously in the past. It appears a transistor on the PCB was burned out. I've wired up a new PCB with more stronger transistors and now the entire PCB is malfunctioning and I need help. Design files will be provided once a freelancer has been chosen. If you have the necessary skills and expertise in PCB design, and are able to work on a small-sized PCB for a control system, please submit your proposal.
Develop logical equations based on given specifications. Design gate-level schematics to meet all specifications. Utilize CMOS logic to create transistor-level schematics for all logic gates. Calculate W/L ratios for each MOSFET based on transient performance. Determine mid-point voltage, rise time, and fall time for each unique logic gate. Calculate capacitances considering parasitic capacitance values. Prepare a floorplan for layout, considering gate locations, signal distribution, and pad locations.
I am looking for a freelancer who can design a 4 quadrant transimpedance amplifier PCB for my project. The details of the project are as follows: Bandwidth: - The desired bandwidth of the transimpedance amplifier is less than 1MHz. PCB Size: - I do not have a specific size specification for the PCB. Standard size is fine for my requirements. Power Supply Voltage: - The preferred power supply voltage for the PCB is 5V-10V. Skills and Experience: - Experience in designing transimpedance amplifiers with a bandwidth of less than 1MHz. - Proficiency in PCB design and layout. - Knowledge of standard PCB sizes and specifications. - Familiarity with power supply voltage requirements for electronic circuits. - Attention to detail and ability to meet project specifications. If you...
Develop logical equations based on given specifications. Design gate-level schematics to meet all specifications. Utilize CMOS logic to create transistor-level schematics for all logic gates. Calculate W/L ratios for each MOSFET based on transient performance. Determine mid-point voltage, rise time, and fall time for each unique logic gate. Calculate capacitances considering parasitic capacitance values. Prepare a floorplan for layout, considering gate locations, signal distribution, and pad locations.
...to make a Rpi CM4 based carrier board controlled by Tuya IoT & Home assistant. A electrical circuit has been made for CM4. This schematic is 100% finished in EasyEDA by me however Im totally uncertain if my schematic or connections are correct or not. The carrier board interfaces the following: 2x RPi Cam Module v3 1x DC motor (24V 2A) DRV8874 4x proximity sensors 1x Microphone (IS2 MEMS) 1 Amplifier + Speaker Some press buttons 1x Micro-USB connection (I would prefer to change this to USB-C) 40 GPio pin header for testing purposes Once it is done and the PCB assembled I wish to use the Tuya firmware and design a nice Tuya Ui (panel) for this device. * I need someone to confirm if the schematic is fully working and no missconnections, everything is connected well to avoi...
Hello, I am looking for a new or reconditioned amplifier for my home setup. I am open to any brand and I am looking to spend between $100 and $500 on this purchase. If you think you can help me find the perfect amplifier within my budget, I’d love to work with you. Thank you!
I'm looking for an experienced PCB designer to work on a project for me. The desired size of the PCB is small (less than 5cm). The primary function of the board is integrate Bluetooth LE module with battery power module and a single stage charge amplifier. I have confidence that the designer will be able to determine the appropriate components to use on the board, so I do not have a specific list of components at this time. I am attaching a specification document below with brief description.
...incorporates various features to enhance the testing experience for students. Key Responsibilities: 1. Design and develop a customized testing application tailored to specific requirements and functionalities outlined in the project brief. 2. Collaborate with stakeholders to gather detailed requirements, ensuring a clear understanding of the desired features and functionalities. 3. Implement multistage adaptive testing (MST) methodology to ensure the test adapts to individual test takers' performance. 4. Integrate universal tools, such as a built-in graphing calculator, annotation tool, answer choice elimination tool, and other necessary features. 5. Ensure the application is robust and can withstand brief internet outages, allowing uninterrupted progress during testing. 6....
I'm looking for an experienced PCB designer to work on a project for me. The desired size of the PCB is small (less than 5cm). The primary function of the board is integrate Bluetooth LE module with battery power module and a single stage charge amplifier. I have confidence that the designer will be able to determine the appropriate components to use on the board, so I do not have a specific list of components at this time. I am attaching a specification document below with brief description.
Input 12V I want to connect 3 devices to arduino as below D2 -> DEV1 which requires 1.21V, 0.1A D3 -> DEV2 which requires 1.48V, 0.1A D4 -> DEV3 which requires 1.48V, 0.1A Can you give me transistor circuits with resistor values.
I am looking for a freelancer to create a multistage form in Divi (WordPress) and implement form management functionality. Purpose of the Form: - The form is a confidentiality declaration being collected from a defined team of people. Design/Layout: - I have a simple design in mind for the form, but I am open to suggestions from the freelancer. Number of Stages: - The form should have 4-6 very simple stages for users to complete. Ideal Skills and Experience: - Proficiency in Divi (WordPress) to create and customize the multistage form. - Experience with form management functionality to set up multiple projects and teams of people who need to complete the form. Reporting on status of form completion for each team member. Two factor authentication when form submitted by ea...
Seeking support from a electronics subject matter expert with skills in the below four specific areas of electronic circuit design. 1. Operational amplifier circuit design. 2. Instrumentation amplifier using three Operational Amplifiers. 3. Phase Locked Loop (PLL) - Must be able to work with the S-domain transfer functions for a phase locked loop, very similar it will look like a classic second order transfer function. 4. Reliability, Mean Time Between Failure analysis
I'm developing a gateway station that receives da...route goes to a LDO-3.3V. I don't want to use the module () anymore and embed it to the PCB as a fixed-5V circuit. So i Ask for: 1. Add a transistor circuit to supply 5V to the modem (from the lm2596 regulator) when the ESP32's GPIO commands. Add it to the current version of the schematic and PCB board layout. 2. Do the fixed-5V circuit, according to LM2596 datasheet, in the current schematic and PCB layout. Find the main components (1. transistor; 2. coil, diode, chip regulator) in LCSSC Electronics () so the footprints of the PCB match the solder pins of the packages. Add it to the current version of the PCB board layout.
I am looking for a PCB designer to create a circuit board for a Class-D audio amplifier. The project requires the following: Power Output: - The audio amplifier should have a power output of less than 50W. PCB Size: - The PCB should be designed to a specific size (less than 3 x 2 inches). The PCB will have two inputs one for the audio and one for the power source of +30VDC and -30VDC Input Source: - The amplifier will be used with an analog input source. Ideal Skills and Experience: - Experience in PCB design for audio amplifiers. - Proficiency in working with Class-D amplifier circuits. - Knowledge of analog input source compatibility. - Ability to design PCBs to specific size requirements.
Assist in designing a power amplifier and switching power supplier. The power amplifier will be powered by the off-line switching supply and a Class-D amplifier. Experience with analog electronics is highly preferred.
This project aims to build a custom audio amplifier using an ESP32 WROVER-B, capable of separating audio signals into four distinct frequency bands and amplifying each independently. Users can adjust the amplification levels of each frequency band via an Arduino-based control system. Including PCB source to order PCB.
Scope start date: October the 4th. Scope finish date: October the 7th. Scope duration: 6 hours of work for an experienced individual Seeking support from a electronics subject matter expert with skills in the below four specific areas of electronic circuit design. 1. Operational amplifier circuit design. 2. Instrumentation amplifier using three Operational Amplifiers. 3. Phase Locked Loop (PLL) - Must be able to work with the S-domain transfer functions for a phase locked loop, very similar it will look like a classic second order transfer function. 4. Reliability, Mean Time Between Failure analysis
I am in need of a freelancer to help me reassemble my Technics sound system. Unfortunately, I do not have the necessary instructions to do so. I need someone who can physically reassemble the system for me. If you know how to properly reassemble Technics sound system that includes, equaliser, cassettee player, amplifier, vinyl player etc and are comfortable helping me out, please bid on my project. I am looking forward to hearing from you soon. Thank you!
I am looking for a freelancer who can help me troubleshoot programming issues with my ESP32. I am using the Arduino IDE and I have existing code that isn't working properly. THis should be a simple project. I'm using the ESP8266 Audio Library which gets it MP3 data from a SD MMC card. We can read from the SD Card. The problem is I do not know how to direct the output to my Max98357A amplifier using the I2S bus. I need someone to correct my code to accomplish this. Skills and experience required: - Strong knowledge and experience with ESP32 troubleshooting - Proficiency in programming with Arduino IDE - Ability to analyze and debug existing code - Familiarity with ESP32 hardware and functionality - Problem-solving skills to identify and resolve programming issues If...
...for a freelancer who can modify my code for a ESP32 using the ESP8266Audio Library and get it to play the video which is sync'd with the audio. The audio file is read from an SD card using the SD_MMC.h library. I'm using the ESP8266Audio Library to play the file. The output should go to a Max98357A amplifier that uses DOUT on pin GPIO_22, BCLK on pin GPIO_26, LRC on pin GPIO_25. The video portion works fine. The problem is, we can't hear anything from the speaker. But we know the amplifier and pinouts are correct because they function using another library. The timeline for these modifications is short-term, within a week. We need someone to help us get this working. Ideal Skills and Experience: - Proficient in programming with the ESP32 for video us...
We are going to make an amplifier board. The final deliverables are: - Schematics - Gerbers - BoM Only individual engineers are acceptable.
I have a custom board that uses an nRF52840 microcontroller with an nRF21540 FEM bluetooth amplifier. I need a programmer who can create a bluetooth connection between my board and a smartphone in Long Range (Coded PHY) mode. The ideal candidate should have experience programming Nordic Semiconductor nRF52 microcontrollers in VS Code + nRF Connect SDK environment and have experience with NRF21540 FEM. Also, ideally, he should have a nRF52840 DK or nRF21540 DK debug board on which he will debug the program. I am looking forward to your suggestions and hope for fruitful cooperation.
...independently. 2. Use constant current method @ 300mA to charge when the battery temperature is between 0°C and +45°C and when the cells are between 2.5V and 3.45V. 3. Cells should not charge when the battery temperature is above 45°C. 4. Cells will not discharge when the battery temperature is BELOW -20°C or ABOVE 60°C. 5. Each cell is monitored utilizing a unity-gain differential amplifier with the amplifier output going into the PIC16. (PIC 32 or other PIC may be utilized for efficiency of design or code). 6. Each cell will be maintained when 3.45V or above by utilizing trickle charging technique of 20mA charge @ 3.65V. 7. Each cell must be monitored for temperature. If any temperature sensor determines abnormal temperatures, the micro wi...
I am looking for someone to change the amplifier in my client office, we can use termination block to join all speaker channel together, but client prefer to join all the speaker zones together. Also need to do a small retermination on the existing ceiling speakers
I am looking for someone to design a power amplifier for a home audio system. The desired power output is 100 watts, and the preferred technology for the amplifier is Transistor-based. The amplifier should provide an optimal sound quality for an enhanced listening experience. The end product should be stable, durable, and reliable for long term use. The technical and creative skills of the freelancer should align with this project's needs.
I am looking for an experienced freelancer to assist with an assignment on transistors of electronic. This project should focus on transistor circuits and applications and have a theoretical approach. I require a high-level overview of the content in the assignment with key details as needed to demonstrate knowledge and understanding of the topics. Any references used must be correctly cited.
I am looking for a skilled freelancer who can design and create an aluminum enclosure for my HiFi Amplifier. The project requires the following: See details in the attached pdf. Skills and Experience: - Experience in designing and creating aluminum enclosures for audio equipment is essential. - Proficiency in 3D CAD software to accurately create the design. - Knowledge of different finishing techniques for aluminum, especially anodized brushed finish. If you have the necessary skills and experience, please submit your proposal. Thank you.
...real one. Suggest any optimizations that will decrease the price and increase the performance. The speaker is 40 ohms. Skills and Experience: - Experience in designing and building amplifiers for non-standard platforms - Expertise in developing high power amplifiers - Understanding of the specific requirements and constraints of the intended use case - Ability to customize and optimize the amplifier design based on the client's specifications - Knowledge of audio signal processing and amplification techniques - Strong problem-solving skills to address any technical challenges that may arise during the project Description: We have a working prototype of our AMP and would like to create 10 more. Before doing so, we would like to use Tinkercad Circuits to simulate it. ...
I have a custom board that uses an nRF52840 microcontroller with an nRF21540 FEM bluetooth amplifier. I need a programmer who can create a bluetooth connection between my board and a smartphone in Long Range (Coded PHY) mode. The ideal candidate should have experience programming Nordic Semiconductor nRF52 microcontrollers in VS Code + nRF Connect SDK environment and have experience with NRF21540 FEM. Also, ideally, he should have a nRF52840 DK or nRF21540 DK debug board on which he will debug the program. I am looking forward to your suggestions and hope for fruitful cooperation.
Design a three operational amplifier instrumentation amplifier circuit, inclusive of EMI reduction.
I am looking for an experienced engineer who can create an Agilent Advanced Design System model of an avalanche transistor pulse generator. I am teaching my students about effects such as reflections from impedance discontinuities, propagation time, dispersion etc through a combination of experimental work and modelling. To support the course I am creating, I would like to have a transient model of Jim Williams' famous avalanche transistor-based pulse generator that was published in Analog Device's application note AN47. I am NOT after a simple pSpice/LTspice model - these are trivial to make using spice models of transistors available for download. I need a model that incorporates real transmission line/geometric effects and can fuse electromagnetic models with...
...temperature is below 113°F. Cells should not charge when the battery temperature is above 113°F. Cells will not discharge when the battery temperature is above 132°F by disconnecting from the load. Individual cells will be disconnected from the circuit when they are below 2.5V. Disconnected cells will be bypassed in the charge circuit. Each cell is monitored utilizing a unity-gain differential amplifier with the output going into the PIC16. Each cell will utilize a constant current method between 2.5V and 3.65V at 300mA maximum charge current. Each cells will be maintained when 3.65V or above by utilizing trickle charging technique of 20mA charge @ 3.65V. Each cell will be disconnected from the 4-cell series if they are below 2.0V, or above 132°F. If any cell is d...
Project is to breadboard and deliver to USA a 4.37 kHz signal generator and adjustable 1-20 Watt RF amplifier that transmits using an omnidirectional single wire antenna +/- 140cm in length. 100% duty cycle in 24C ambient. Input V determined by you to create most efficient design.
