Circuit Blox 120 Set: What's Inside and What You Can Build
By Startseite | Published: 2026-10-17
Category: Product Reviews
Explore the Circuit Blox 120 set's projects, parts, and educational value. Learn what you can build and if it's right for your young engineer.
Quick Answer
The Circuit Blox 120 set is a solid STEM choice for kids who want to learn about electricity by building real projects like an FM radio. With 120 projects and a Creative Child Magazine award, it offers strong educational value, but it's not the largest kit in the line—consider your child's age and interest before buying.
What's Inside the Box
The Circuit Blox 120 kit includes colorful building blocks with electronic components inside. It comes with parts like switches, a lamp, LEDs, a speaker, an audio block, an amplifier block, an FM receiver block, and a motor. These blocks snap together to create working circuits without soldering or wires, making it safe and easy for kids to handle.
The set is designed to teach electricity, current, and voltage through hands-on projects. You'll learn how lights, alarms, motors, and switches work by building them yourself. The included guide walks you through each project step by step, so even beginners can follow along.
What You Can Build
With 120 projects, you can build a variety of circuits, from simple light-up setups to more complex devices. One standout project is a working FM radio that lets you tune into your favorite station. You can also build alarms, flying fans, and transistor amplifiers, depending on the parts included.
The projects are designed to be educational and fun, reinforcing concepts like series and parallel circuits. As kids progress, they'll gain confidence in troubleshooting and problem-solving, which are key STEM skills.
How It Compares to Other E-Blox Sets
The Circuit Blox 120 is a mid-range kit, offering more projects than the smaller BYO Flying Saucer (4 projects) but fewer than the Circuit Blox 395 (395 projects). If your child is new to circuits, the 120 set provides a good balance of variety and simplicity. If they're already experienced, the 395 set might be a better long-term investment.
All Circuit Blox parts are compatible with each other, so you can expand your collection over time. This makes the 120 set a great starting point if you plan to add more kits later.
Decision Rules
- Age and Experience: The 120 set is best for kids around 8 and up who can follow instructions and have some patience. If your child is younger or easily frustrated, start with a smaller kit like the BYO Flying Saucer. Choose the 120 if your child is ready for guided projects with moderate complexity.
- Project Variety: With 120 projects, there's enough variety to keep kids engaged for weeks. If you want more projects without buying another kit, the 395 set offers over three times as many. However, the 120 set is more affordable and less overwhelming for beginners. Pick the 120 for a balanced introduction; choose the 395 if you want long-term value and more advanced builds.
- Educational Goals: If your goal is to teach electricity concepts, the 120 set covers current, voltage, and basic components effectively. For deeper exploration of amplifiers and light-activated circuits, the 395 set goes further. The 120 set is sufficient for foundational STEM learning.
Product Facts
- Circuit Blox™ 120 - E-Blox® Circuit Board Building Blocks Toys for Kids: Winner of Creative Child Magazine Creative Play of the Year, Product of the Year for 2017, TillyWig Brain Child, and Purdue University Engineering and Design Award! Great addition to any STEM program. Learn all about electricity, current and voltage. Discover how lights, alarms, motors, switches and more work all while building fun projects. Build a real working FM radio and listen to your favorite station. These awards and the FM radio project show that the kit is both educational and engaging, making it a reliable choice for parents and teachers.
- Circuit Blox™ 395 - E-Blox® Circuit Board Building Blocks Toys for Kids: There are 395 different projects to build, and all parts are compatible with our Power Blox line to add even more fun to your building experience. Some of the fun projects you will build include light activated sirens, alarms, birthday song, flying fan, and transistor amplifiers. The kit includes various switches, lamp, heart and star LEDs, speaker, audio block, amplifier block, FM receiver block, motor, and more. If your child outgrows the 120 set, the 395 kit offers more advanced projects and compatibility with Power Blox, making it a natural next step.
Who It's For
Best for
- Kids aged 8+ who are new to circuits and want a guided, hands-on learning experience.
- Families looking for an award-winning STEM toy that teaches electricity through play.
Not for
- Older kids or advanced builders who may quickly outgrow the 120 projects.
- Those on a tight budget who might prefer the smaller, cheaper BYO Flying Saucer as a trial.
