Working principle of dynamic microphone

Dynamic microphone does not require power
1. In the speaker, there is a coil embedded in the gap of the ring magnet. When an audio current shu passes through, it generates a magnetic field that changes with the current law. Under the combined action of the ring magnet, the coil is charged and the sound film vibrates. makes a sound.

The working process is to convert electrical energy into mechanical energy (vibration).

2.The structure of the dynamic microphone is basically similar to that of the loudspeaker, and the working process is opposite. The sound-the vibration of the sound film-the cutting of the magnetic lines of force-generates the audio current.
The working process is to convert mechanical energy (vibration) into electrical energy.
The dynamic microphone is electromagnetic induction, which vibrates the air caused by the sound, which is the coil vibration, which generates an induced current.

A moving coil speaker is a wire that moves under a force in a magnetic field to push the diaphragm to produce sound

USB Microphone:https://www.soft-voice.com/