Here is a simple RF bug detector that will help you detect spy bugs and can operate up to 2 GHz. Below are some essential things required for this circuit: to cover a large frequency band make a sound ...

An “Infinite Impedance Detector” might sound a little like something that ... [Sebastian]’s JFET-based detector circuit might look strangely familiar. That’s because this demodulator ...

There’s also a sound-detection circuit, which prompts the robot to wiggle when it detects a whistle via an attached microphone. The entire circuitry is free-formed using brass wire, and the ...

Scientists have demonstrated a new kind of detector for sound at the level of quietness of quantum mechanics. The result offers prospects of a new class of quantum hybrid circuits that mix ...

Daeshik Kang and Mansoo Choi of Seoul National University and their colleagues wondered if they could mimic that response to build a flexible, tiny and very sensitive sound detector. Their ...