Build a Transistor Gain hFE Tester with Arduino — Instant Component Characterisation

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

Imagine you’ve salvaged a handful of transistors from old circuits but have no idea if they still work to spec. With this kit, you insert a BC547 or BC557 into the dedicated test socket, and the Arduino Uno immediately measures both base current and collector current, calculates hFE (DC current gain), and displays the result on the included 16x2 LCD. It’s the fastest way to grade, match, or troubleshoot bipolar junction transistors without a pricey bench meter.

What You'll Build

You’ll assemble a portable, battery-powered transistor tester that reads out hFE values for NPN and PNP devices. The unit uses a simple resistor network to bias the transistor safely, an Arduino to perform the calculations, and an I2C LCD to present the gain. Once built, you’ll have a reliable tool for your electronics workbench, capable of testing common small-signal transistors in seconds.

What You'll Learn

• Practical transistor biasing and the relationship between base current, collector current, and gain
• Arduino programming for analog measurement and data processing
• Interfacing an I2C LCD for real-time data display
• Prototyping on a breadboard and building a robust, repeatable circuit

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is designed for CBSE Class 11–12 students exploring semiconductor devices in their physics curriculum, B.Tech ECE/EEE first-year students needing a hands-on transistor characterization project, ATL Tinkering Lab facilitators looking for ready-to-run STEM activities, and electronics hobbyists across India who want a dependable transistor gain tester on their desk.

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.