All Keystone Science videos

Signal build

3D printed AM radio!

Start with the video, then use the science notes and recommended parts below to follow the idea behind the build.

Radio & soundBuildRadio
Watch on YouTube

How it works

What this project is testing.

An AM radio is a filter for the electromagnetic clutter around us. The antenna hears lots of stations at once, but the tuned part of the radio prefers one frequency and ignores most of the rest.

Read more

The 3D-printed body makes the build tangible, but the science is resonance and detection. Tune the resonator to the station, then recover the audio by following the changing amplitude of the radio wave.

The coil and capacitor choose the station by resonating at one frequency.
Radio wavelength is set by the wave speed divided by carrier frequency.

Recommended parts

Products used in this project.

Affiliate links may earn Keystone Science a commission. Match ratings, values, sizes, polarity, and safety requirements to your own build before buying.

Panasonic Portable AM/FM Radio, Battery Operated Analog Radio, AC Powered, Silver (RF-2400D)
AM/FM radio receiverradio

Panasonic RF-2400D Portable AM/FM Radio, Battery Operated or AC Powered

$29.994.5(33K)
View on Amazon

Project files

Prints, kits, and downloads.

Diagrams, printable files, kits, or companion downloads will appear here when they are ready to use.

Coming soon

Contact

Events, speaking, collaborations, and news.

Send the project name, outlet or audience, timing, location, and the context you want covered.

Email Keystone Science