Recover Signals Thought Lost in Noise: Build a Lock-In Amplifier with Arduino Mega

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

This kit lets you construct a fully operational lock-in amplifier — a precision instrument that uses synchronous detection to pull a weak sinusoidal signal out of background noise up to 40 dB stronger. The AD9833 programmable waveform generator provides a clean reference, while the 16-bit ADS1115 ADC and a dual-op-amp phase-sensitive detector do the heavy lifting. Whether you are measuring faint photodiode currents, strain gauge outputs, or low-level sensor signals, this project will give you a deep, hands-on understanding of how to see what conventional instruments miss.

What You'll Build

You assemble a bench-ready lock-in amplifier that displays recovered signal amplitude and phase in real‑time on a 1.8‑inch TFT colour screen. The system generates a reference sine wave, processes the unknown input through an LM358‑based analog multiplier stage, filters out uncorrelated noise, and then feeds the result to the ADS1115 for ultra‑clean digital readout. The Arduino Mega orchestrates everything, giving you a tool that can resolve signals down to microvolts even when noise peaks are hundreds of millivolts.

What You'll Learn

• Generate a programmable sinusoidal reference with the AD9833 DDS module and configure its frequency registers.
• Implement phase‑sensitive detection using an analog multiplication circuit built around the LM358 dual op‑amp.
• Integrate the 16‑bit ADS1115 ADC for high‑resolution sampling and precise amplitude measurement.
• Process and display the recovered signal on a ST7735 TFT, complete with filtering and phase‑angle calculation.

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 12 students building advanced physics instrumentation projects will find this an ideal entry into precision measurement. B.Tech ECE/EEE undergraduates can use it to prototype signal‑conditioning chains for their major or minor projects, and Smart India Hackathon teams working on biomedical or environmental sensing will gain a practical lock‑in detection module that can be integrated into a larger system. ATL Tinkering Labs and student clubs at institutions like IITs, NITs, VIT, and BITS Pilani will also appreciate its depth and reusability.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.

Choose your assembly option:

• Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
• Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.