Build a Real Quiz Buzzer & Master Transistor Latching Circuits

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 turning any family quiz night or classroom activity into a head-to-head buzzer battle — the first person to press their button locks in a glowing LED and freezes the opponent out. This kit brings that real TV-game-show excitement home without a single line of code or a soldering iron. Using two BC547 transistors as electronic switches, kids create a latching circuit that remembers who pressed first, lighting a red or green LED until the 9V battery is disconnected.

What You'll Build

A two-player electric quiz buzzer with a permanent winner indicator. Each player gets a large push button and a dedicated LED — one red, one green. The moment a button is pressed, its LED turns on and stays on, and the opposing button becomes unresponsive. It’s a live demonstration of how a transistor latch works, perfect for science fairs, tinkering labs, or just beating your sibling in trivia.

What You'll Learn

• How a transistor acts as an electronic switch and holds a state
• Building a latching circuit that “remembers” the first input
• Placing components on a breadboard using a schematic
• Troubleshooting a real circuit with an interactive AI guide

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Young inventors aged 6–8 who love hands-on tinkering and parents who want a clean, no-mess STEM activity. It’s ideal for CBSE Class 1–3 science projects, Atal Tinkering Labs in primary schools, and introducing the basics of electronics as recommended under NCERT’s activity-based approach. Even older siblings can jump in to set up a real quiz competition at home.

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.