Lavalier or "lapel" mics are compact clip-on devices designed for hands-free audio recording. Typically worn near the chest, ...

The power necessary to run these circuits may come from a small battery in the microphone or from another external device (such as the mixer or the recorder). This is called phantom power and is a ...

The heart of the build is a preamplifier that runs off standard 48 V phantom power, and is responsible for both biasing the electret microphone element and acting as a buffer for the mic signal.

Instead, this design relies on a dual OPA1642 op-amp, with its low quiescent current meaning it’s perfect for running off phantom power. This means the microphone needs no batteries, and using a ...