High-Precision Sine Wave Generator (USB-Controlled) – Prototype + Firmware + Analog Design

I am looking for a highly experienced embedded + analog design engineer to develop a high-precision sine wave generation system with real-time USB control. This is a result-driven project focused on delivering a working, validated prototype, not just schematics. System Requirements 1. Sine Wave Generation DDS-based solution (e.g., AD9833 or better alternative – developer may choose) Frequency range: up to ~10 kHz (focus on stability, purity, low distortion) Proper analog filtering required (low-pass) 2. Amplitude Control Controlled via DAC (e.g., MCP4822 or equivalent – developer may choose) Adjustable via PC interface (not continuously dynamic) Stable and calibrated output expected 3. Offset Control (Critical Feature) Real-time adjustable DC offset via USB interface Update rate target: ~10 kHz Smooth and predictable response (no major glitches) 4. Microcontroller Preferred: Teensy 4.1 (or equivalent high-performance MCU) Must handle: USB communication (PC and MCU) SPI communication (DDS + DAC on shared bus) Deterministic timing for DAC updates 5. Analog Stage Op-amp based summing / conditioning stage (e.g., NE5532 / OPA series or equivalent) Must support: DDS sine input DAC-controlled offset Amplitude scaling Clean output with minimal distortion and noise Dual supply (±V) design is allowed and preferred if required for performance Key Deliverables (MANDATORY) 1. Working Prototype (Critical Deliverable) Fully functional hardware prototype (breadboard or PCB acceptable) Must demonstrate: Stable sine wave output USB-controlled offset behavior Configurable amplitude Live demonstration over video call is mandatory Must show: Real waveform on oscilloscope Response to PC commands in real-time 2. Firmware Complete source code (Arduino IDE compatible preferred) Includes: USB communication protocol SPI control for DDS and DAC Real-time offset update handling Code must be clean, documented, and reusable 3. PC Interface (Basic UI) Simple PC-side interface (any language: Python / C# / etc.) Must allow: Setting amplitude Real-time offset control No need for complex UI, functionality is priority. 4. Design Files Complete schematic (DDS + DAC + analog stage) Component selection with justification Basic PCB/layout recommendations (optional but preferred) 5. Calibration Method Clear method to map digital input → actual output voltage Ensures repeatability and predictable behavior Strict Requirements (Read Carefully Before Applying) This is not a theory or design-only project Payment will be released ONLY after successful live demo of working prototype No intermediate milestones will be created or paid Must be comfortable working with: Mixed-signal systems (DDS + DAC + op-amp) Real hardware debugging Measurement validation (oscilloscope, etc.) Preferred Expertise Strong embedded development (Teensy / ARM / real-time systems) Deep analog design experience (low-noise, signal conditioning) Prior work in: Function generators Signal processing hardware DDS/DAC-based systems Screening Criteria (Strict Filtering) Applications will be ignored if: No relevant mixed-signal project experience is shown Only software/firmware background without analog experience No proof of hardware prototyping capability Preference given to candidates who: Share past project examples (preferably with waveforms or demos) Demonstrate understanding of noise, distortion, and signal integrity Can clearly explain their design approach upfront Final Note This project targets a semi-instrument-grade signal system. Attention to detail, clean design, and real-world validation are critical. If you are confident in delivering a working, tested prototype with both firmware and analog integrity, apply with your approach and past work.

Project ID: 40389615