The EMF Explorer Badge is a hands-on soldering kit that turns the invisible electrical activity of everyday electronics into sound. Walk around, listen, compare devices, and build intuition for the signals hiding in the modern world.
An electromagnetic frequency sensing circuit that lets you listen to the hidden electrical world - the way Bluetooth hardware sounds when it's transmitting, how a laptop touchpad clicks under your finger, the hum of a power supply behind a wall.
Inductors on the board pick up EMF in the 20Hz–20kHz range and amplify it ~1000x into your headphones - frequencies your ears couldn't otherwise catch.
A guided through-hole soldering kit. No previous electronics experience required - every part is labeled, every step explained.
Once assembled, it's a glowing wearable badge on a lanyard - light your path at night, then go sniff out signals with headphones.
From hackerspaces to Maker Faires to Chaos Communication Congress - explorers have been listening to the world.
Pick up a kit from one of these retailers, order a bare PCB, or build from the open hardware files.
Soldering kit, ships worldwide from the US.
Shop NowSoldering kit, ships worldwide from the UK.
Shop NowOrder direct for local pickup from SporkLogic.
OrderOrder a bare purple PCB and source your own components.
Order PCBDownload the design files and build from scratch. Fully open hardware.
View on GitHubExplore, listen, and learn your way through the invisible electrical layer of the modern world. EMF Explorer is open hardware, made with care by SporkLogic.