1. Microphone research project: The Dynamic Microphone Alice Gold

2. The Dynamic Microphone A microphone is an acoustic-to-electronic transducer or sensor that converts sound into an electric signal. The Dynamic Microphone, in principle, operates by using electromagnetic induction to generate an output signal. Electromagnetic induction is the production of a potential difference across a conductor when it is exposed to a varying magnetic field.

3. The Dynamic Microphone Dynamic microphones are robust, relatively inexpensive and resistant to moisture. This, coupled with their potentially high gain before feedback, makes them ideal for on- stage use. They use the same dynamic principle that is used in a loud speaker only it’s reversed.

4. The Dynamic Microphone There is a small and moveable induction coil, positioned in the magnetic field of a permanent magnet and it is attached to the diaphragm (the inside part of the microphone above the magnet). When sound enters through the windscreen (the outer covering of the microphone) of the microphone, the sound wave moves the diaphragm. When the diaphragm vibrates, the coil moves in the magnetic field, producing a varying current in the coil through electromagnetic induction. Also, a typical stage dynamic microphone has a “cardioid” pickup pattern so it picks up sound better from a single direction.

5. The Dynamic Microphone A typical budget dynamic microphone has an upper frequency-response limit around 16kHz. Most dynamic microphones don’t do justice to very high-frequency sounds such as symbols, bells, or upper harmonics of the acoustic guitar or piano. High-frequency detail reproduction isn’t as good as with a capacitor microphone so, in audio engineering, several kinds of microphones are used at the same time to get the best result. Dynamic microphones are generally more useful when the sound source is close and reasonably loud.

6. The Dynamic Microphone Dynamic microphones have the benefit of being tough and relatively inexpensive, and they don’t require batteries for their power. The more expensive dynamic microphones have the best sensitivity, the smoothest frequency response, and the most natural sound.. However, no two models are the same.

7. The Dynamic Microphone The final shortcoming of the dynamic microphone is its restricted sensitivity; the less sensitive a microphone is, the more amplification you need to get the sound up to a useful level.

8. The Dynamic Microphone http://www.youtube.com/watch?v=fqZYwhStc KI http://www.youtube.com/watch?v=fqZYwhStc KI Start video at 1:02 End video at 1:59