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Carolina® AM Crystal Radio Kit

Item # 754010 Exclusive This product is exclusive to Carolina Biological Supply. With Digital This kit includes 1-year access to digital resources including videos, digital teacher’s manuals, printable student guides, interactive lessons, editable assessment questions, and more.

Grades 9–12. In this activity, student teams construct working AM crystal radios, learning how modern communication systems transmit information using electromagnetic radiation to encode a signal. Includes a battery-powered speaker (with internal rechargeable battery) that amplifies the radio signal for testing and listening. Kit contains materials to build 10 crystal radios and is designed for a class of 30 students.



In stock and available to ship.

Students will construct and then evaluate separate components of a crystal radio, relating the electromagnetic structure of parts to the function of the component and then engineer the components into a complete, working crystal radio.

PE: HS-PS4-5
Related PEs: HS-PS4-3, HS-PS3-3
Time Requirement: 90 minutes

SEP: Obtaining, Evaluating, and Communicating Information
CCC: Structure and Function
DCI: HS-PS4.C: Information Technologies and Instrumentation

Grades 9–12. Using kit materials, students construct a working AM crystal radio, popular in the early days of broadcasting, to tune into local stations. They build circuit components from aluminum foil, copper wire, and cardboard tubes. Students learn how modern communication systems transmit information using electromagnetic radiation to encode a signal. A battery-powered speaker (with internal rechargeable battery) is included to amplify the radio signal for testing and listening.

During the activity, students observe energy conversion between different forms (e.g., electrical energy to mechanical energy) and build upon their knowledge of wave properties by learning:

  • How transducers convert the signal's electrical energy into a mechanical sound wave.
  • The relationships between inductance, capacitance, and resonance in tuning to a radio station and building the classic LC (inductor-capacitor) tank circuit.

Designed for a class of 30 students, the kit contains materials to construct 10 functioning crystal radios and includes free 1-year access to digital resources that support 3-dimensional instruction for NGSS. A high-impedance piezoelectric earphone (item #754012), similar to the ones used with WWII-era foxhole radios, can be purchased separately.

This kit builds toward the following Performance Expectations within the Next Generation Science Standards*: Waves and Their Applications in Technologies for Information Transfer, HS-PS4-5 and HS-PS4-3; and Energy, HS-PS3-3.

The Carolina® AM Crystal Radio Kit is designed to integrate into a larger unit with lessons addressing wave mechanics, electricity, magnetism, and electromagnetism.

*Next Generation Science Standards® is a registered trademark of WestEd. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it.

  • This item is only available from Carolina Biological Supply Company.

Product Families Featuring This Item:

Components Qty Included?
Hook-Up Wire, 22 gauge, 100-ft Roll 2 Included
Magnet Wire, 28 gauge, 75-ft Roll 10 Included
Cardboard Tubes (long), 22.7 cm 10 Included
Cardboard Tubes (short), 15 cm 10 Included
Cardboard Sheets 10 Included
Brass Brads 100 Included
Aluminum Foil, 25-ft Roll 1 Included
Alligator Clip Leads 30 Included
Germanium Diode, 1N34A 10 Included
Amplified Speaker, Battery Powered (includes internal rechargeable battery) 1 Included
Carolina Science Online® Resources (1-year subscription) 1 Included
Teacher's Manual with Reproducible Student Guide 1 Included
Wire Stripper 2 Needed, Not Included
Scissors 2 Needed, Not Included
Tape 1 Needed, Not Included
Ruler 1 Needed, Not Included
Hole Punch 2 Needed, Not Included
Nail Needed, Not Included
Sandpaper Needed, Not Included
White Paper Needed, Not Included
Glue Needed, Not Included
Stapler 2 Needed, Not Included
High-Impedance Piezoelectric Earpiece (optional) Optional, Not Included
Oscilloscope (optional) Optional, Not Included
Digital Multimeter (optional) Optional, Not Included
Binder Clips (optional) Optional, Not Included
Wooden Dowels (optional) Needed, Not Included
AM Radio (optional) Needed, Not Included