Grand Idea Studio

High-Frequency Single Tone Generator

 

The High-Frequency Single Tone Generator, created in March 1989, is a simple mischievous device intended to annoy anyone within its range. A simple 555 timer generates an adjustable, high-frequency square wave, which is fed into a piezo buzzer, creating a difficult to locate audio output. For the ultimate in covert operations, the circuitry is hidden within a Sucrets throat lozenge tin.

Press

Unnamed Reverse Engineering Podcast

014 - Ferrycast

Supplyframe Hardware

HDDG 31: Tech-Fashion, Wearables, ...

Hackaday

Joe Grand is hiding data in plain ...