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PROJECT

Eavesdrop

REVV1.0 [FINISHED]
CLASSCURRENT-CARRIER

A current-carrier bug: a listening device that captures audio and transmits it through a building's AC power wiring to a paired receiver, evading RF detection as a whole. Current-carrier devices are a documented category of covert listener; this one was built for electronics research and lawful testing on my own equipment.

I designed the full signal path: the microphone preamplifier, the carrier modulation stage that rides the mains, and the recovery stage on the receiver. Schematics and both PCBs were drawn in KiCad.

NOTE - mains voltage on the carrier path. Documented for research on my own equipment only.

SPECIFICATIONS

PrincipleCurrent-carrier transmission over AC power wiring; no RF emission to sweep for
SenderMicrophone preamplifier + carrier modulation stage, plugs into mains
ReceiverPaired recovery stage on the same wiring; Eavesdrop Receiver V1.0 board
DesignSchematics and PCBs in KiCad; ~32-part BOM
StatusFinished

FIGURES

Eavesdrop receiver board, 3D model
FIG.1 - Receiver board, 3D model.
Sender schematic
FIG.2 - Sender schematic.
Receiver PCB layout
FIG.3 - Receiver PCB layout.

REPOSITORY

github.com/SamyIOoOI/Eavesdrop