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I’m experiencing suspicious radio-frequency activity that appears to shadow me from place to place. To put the matter to rest—and, if warranted, take legal action—I need a qualified RF engineer to carry out a comprehensive signal analysis, identify any illicit transmitters, and compile hard evidence. Scope of work • Perform an on-site and near-site sweep that covers my home and the immediate surroundings, with attention to possible satellite-related links. • Use professional-grade spectrum analysers, SDR setups, near-field probes, and direction-finding gear to hunt for audio bugs, covert video cameras, and GPS trackers—each is a genuine concern. • Log every anomaly, capture signal characteristics (frequency, modulation, duty cycle, power level,...

A dedicated PCB will drive a self-service car-wash “vendo” unit built around an Arduino Nano. The board must accept the pulse output from a standard electronic coin slot, translate each valid coin into the required runtime, and use that signal to energise five independent relays that handle pumps, valves, or lights. All relays share a common 12 V source, yet the Nano and logic lines stay safely at 5 V, so on-board regulation (12 V → 5 V buck or linear, as you judge appropriate) is part of the layout. The relays themselves need fly-back protection, status LEDs, screw-terminal or JST headers for easy field wiring, and clear silkscreen labelling. A USB-B or tag-connect footprint for in-circuit programming is also required. Deliverables • Complete schematic (KiCad...

I need a Pre-Amp with volume, bass, and treble controls designed for professional audio equipment. Additionally, I require a 2-way and 3-way Active Cross-Over that is variable, paired with a high-power Class D Power Amplifier capable of delivering between 100W to 500W. The setup should be suited for professional audio applications. Key Requirements: - Features: Pre-Amp with Volume, Bass, Treble, and Variable Active Cross-Over (2-way and 3-way) - Inputs supported: XLR and RCA - Power Output: 100W to 500W Class D Power Amp Preference: - Engineers located in India Ideal Skills and Experience: - Expertise in designing Pre-Amplifiers and Class D Power Amplifiers - Experience with Active Cross-Overs (both 2-way and 3-way) - Knowledge of professional audio equipment design and integration - Pr...

Project Title: Low-Power Cellular IoT Predictive Maintenance & Leak Detection System Project Overview: We are seeking an experienced developer to design and prototype an integrated, low-power, battery-operated IoT device utilizing an off-the-shelf cellular prototyping architecture (e.g., Particle Boron or Blues Wireless Notecard). The device will perform twin monitoring tasks: physical leak detection via a traditional sensor, and mechanical predictive maintenance via Acoustic Anomaly Detection (AAD). The system must run on a battery budget that supports deep sleep, waking up instantly on a leak interrupt or periodically on a timer to perform a self-test and acoustic health assessment. Data must route through a cloud middleware layer via webhooks to a custom website dashboard, with cri...

I'm looking for an experienced PCB designer to create a control board for my standby generator. The PCB should manage an Automatic Transfer Switch (ATS) and engine control, and should include: SPARXX ATS REV A – PCB DESIGN SPECIFICATION Project Design a production-ready PCB-based Automatic Transfer Switch (ATS) controller to replace an existing relay/timer panel while maintaining the same operating logic. Deliverables Required Complete KiCad 9 project Schematics PCB Layout BOM Gerber files Pick and Place files Programming header Source files PCB Size Approximately 3.5" × 7" × 0.5" maximum Reserve approximately 20% of board space for future expansion. Power Inputs: 120 VAC 12 VDC Generator Supply Board must automatically power from either sour...

I'm looking for a skilled engineer to design and develop a GPS receiver primarily for navigation transmit and receive the signal over rf antenna Key Requirements: - The GPS receiver should provide accurate and reliable navigation data. - It must be designed to integrate seamlessly - The design should prioritize user-friendly interface and experience. Ideal Skills and Experience: - Proven experience in GPS technology development. - Strong background in hardware design and software integration. - Ability to create detailed, technical project proposals. Please include detailed project proposals in your application.

I want a small, low-noise pre-amplifier built around the NE5532, powered from + - 15v. The board will slot straight into my DIY projects, so please place the op-amp in an 8-pin DIP socket for easy swapping and surround it with proper rail filtering and local decoupling: • bulk filter capacitors on each rail (before and after any regulators you choose) • 100 nF ceramics tight to every NE5532 supply pin I need two input connection styles on the same PCB—standard RCA jacks plus snap-on terminals—so the preamp can drop into other snap-on equipped modules without adapters. Output may remain RCA only. Deliverables • Complete schematic in your preferred CAD package (KiCad, Eagle, or Altium are all fine) • Clean PCB layout and production-ready Gerbers with ...

Scope of Work AI/ML-Based Predictive Active Hydro-Pneumatic Suspension Control Software Development Project Overview We are developing an Active Hydro-Pneumatic Suspension System for a heavy off-road defence/mining vehicle. The mechanical suspension, hydraulic system, proportional valves, ECU hardware, and sensors are being developed in-house. The objective of this project is to develop an AI/ML-based suspension control algorithm capable of operating in two configurations: Configuration A: Accelerometer-based Active Suspension Control. Configuration B (Optional): LiDAR-assisted Predictive Active Suspension Control. The software shall automatically control the proportional hydraulic valves to achieve optimum ride comfort, vehicle stability, and suspension performance. Scope of Developm...

need a straightforward 2-bit counter designed entirely with discrete Bipolar Junction Transistor (BJT) logic. My priority is to keep the component count as low as practical while still delivering clean, glitch-free counting through the four binary states (00-01-10-11). • Use only BJTs – no FETs, ICs, or microcontrollers • Favor the fewest possible transistors and passives without compromising function • Standard 5 V logic levels are ideal, though I’m open to 3.3 V if that helps reduce parts Ultimately, the most important thing is that the design works practically on the breadboard—without issues and without noise.

I'm seeking an experienced RF circuit designer to develop an RF amplifier. The amplifier should operate in the high-frequency range of 3 GHz to 30 GHz, with a medium output power level between 1W and 10W. Ideal Skills and Experience: - Expertise in RF circuit design - Proficiency in working with high-frequency components - Experience with medium power RF amplifiers - Knowledge of stability and linearity in RF circuits - Familiarity with simulation tools (e.g., ADS, HFSS) Please provide relevant work samples and a brief project plan.

I’m developing a signal-processing module and need a purpose-built power inverter circuit to drive it reliably from a 12 V DC source. The job centres on circuit design; PCB work can follow later once the schematic is locked down. Here’s what I’m looking for: • A complete schematic for a high-efficiency DC-to-AC inverter that delivers clean, low-ripple rails suitable for sensitive analogue and mixed-signal stages. • Component selection with readily available parts and clear justification for each choice. • SPICE-level simulations (LTspice, PSpice or similar) showing expected efficiency, output wave-form quality and thermal performance under 25 W continuous load. • A brief design report summarising calculations, key assumptions and any trade-offs ...

This is a hardware development project. I require a fully functional working prototype, not a simulation, research paper, or theoretical design. The final deliverable must demonstrate ultrasonic TOF measurement on small non-ferrous metal components through a working prototype and demonstration video. I need help taking a lab-bench concept for measuring ultrasonic wave velocity and turning it into a rugged, handheld instrument that works reliably on Platinum, Silver, Nickel, and brass samples. The core tasks include designing the full analog front-end (pulser/receiver, low-noise pre-amp, gain control, anti-alias filters), selecting and driving the piezo transducers, and implementing a precise time-of-flight algorithm in an embedded platform. I am open to ARM, DSP, or FPGA solutions as ...

I need a PCB hardware designer who already understands fuel-grade gas dispenser electronics and has hands-on experience designing intrinsically safe circuits. The job centres on the control system of the dispenser; the board you create must reliably manage flow-rate control while meeting the strict electrical safety demands of hazardous-area operation. Here’s what I expect from the engagement: • Develop a full schematic that integrates the pump’s sensors, valve drivers and my chosen microcontroller, then add a custom zener-barrier stage to limit energy into the hazardous zone. • Lay out a compact, production-ready PCB (Altium Designer or KiCad are both fine) observing creepage, clearance and thermal guidelines for ATEX/IECEx intrinsic-safety compliance. • P...

We need to solve using Simulink,Simscape,Simscape Fluids (Isothermal Liquid Library)

​"Hi, I want to place an order for a premium, custom High-Power Mono Amplifier PCB design. This amplifier will be installed on a tractor and needs to be completely rugged, high-performance, and bulletproof. It will mostly drive heavy loads like four 12-inch or two 16-inch woofers, but it must also safely drive small 4-inch speakers without burning them out. ​Please design the PCB combining all the following specifications into a single layout: ​Power & Architecture: High-Power Mono Amplifier using a Dual-Supply (+VCC, GND, -VCC) topology, capable of handling around ±35V to ±45V DC input. ​Output Stage: 4 Power Transistors in total -> 2x 2SC5200 (NPN) and 2x 2SA1943 (PNP) connected in parallel for high current and deep bass. Driver stage should use BD139 and BD140....

The square wave should have an equal mark-to-space ratio, a frequency equal to that of the resonant frequency of the metal bar estimated in Part 1, and an output voltage going from 0 volts to +15 volts. Show full working for calculating component values and draw the circuit diagram. Part 1 is measure the frequency response of one of the metal bars from the Electronics Lab. You will need to use the signal generator (function generator) and oscilloscope to do this. Plot the resulting frequency response across the range 100kHz to 200kHz, and state the resonant frequency of the metal bar.

I have a working concept for an E-Rickshaw diagnostic tool based on an ESP32 DevKit V1, and I now need a production-ready 2-layer PCB. All circuitry must operate from the vehicle’s 48 V line, stepped down via an LM2596. The board will drive an I2C OLED, measure battery voltage, and sense individual lines for the horn, headlight, indicators, brake light, and reverse buzzer. Two probes (A & B) are included for quick continuity tests. Good engineering practice is mandatory: reverse-polarity, fuse, TVS and general input protections must be designed-in. Preferred workflow • KiCad is my first choice; if you feel EasyEDA delivers clear advantages, let me know. • Layout decisions should favour ease of assembly over sheer compactness or extra thermal tricks. • Blueto...

I am looking for an experienced Embedded Hardware Design Engineer to develop a custom production-ready WIFI Board for a proprietary embedded electronic product. The selected engineer will be responsible for reviewing the project requirements, designing the complete schematic, selecting suitable components, creating the WIFI Board layout, and preparing the design for manufacturing. Required Expertise - Embedded hardware design - Mixed-signal WIFI Board design - RF WIFI Board layout - Power supply design - Battery-powered embedded systems - Design for Manufacturing (DFM) - Design for Assembly (DFA) - Schematic capture and WIFI Board layout (KiCad or Altium preferred) Deliverables - Complete schematic - WIFI Board layout - Bill of Materials (BOM) - Gerber files - Manufacturing files - A...

I need a working human-computer interface that can both pick up and broadcast data over Bluetooth at the highest speed the protocol allows. The data flowing through it will be full-rate cellular communications data rather than simple audio or text, so throughput and low latency are critical. On the input side the unit will read Qi energy and Acu-meridian energy via harness-style skin contacts. Those raw sensor signals have to be conditioned, digitised and pushed straight to a tablet over Bluetooth without noticeable lag. In the opposite direction the tablet will be able to transmit control or stimulation patterns back to the interface just as quickly. The job covers hardware design, embedded firmware and a basic demo app for a tablet or computer: • Hardware: schematic, PCB layout an...

Hello. I am looking for an experienced Python developer to implement a complete automated trading system for US equities through Interactive Brokers. The system trades a custom trend-following indicator I built and have been using on TradingView. The core work is to connect this indicator to live IBKR trading so it executes automatically. The system is a flip-flop trend trader. It is always in one of two states - LONG or SHORT on any active position. When the indicator detects a confirmed uptrend it goes LONG and rides it. When it detects a confirmed downtrend it flips directly to SHORT - closing the long and opening the short simultaneously on the same bar close. There is no neutral or waiting state between positions. When the market is ranging the system holds its existing position and...

Wireless Load Cell Monitoring Systems About the Role We're building out a wireless weighing and monitoring solution from the ground up, and we need a seasoned embedded engineer who can own the technical journey — from early prototype to a validated, field-ready product. This role sits at the intersection of hardware and software. You won't just be writing firmware in isolation; you'll be shaping system architecture, wiring up hardware, writing and debugging embedded code, and pushing performance across the board. At a high level, the system pulls weight data from a network of load-cell-equipped sensor nodes spread across multiple locations, processes that data on-device, pushes it over a wireless link, and surfaces it through a cloud-connected platform for remote acce...