Liquid Microphones

What is a Liquid Microphone?   A liquid microphone, also known as a water transmitter, is based on Ohm’s law that current in a wire varies inversely with the resistance of the circuit. The sound waves from a human voice cause a diaphragm to vibrate. This...

Crystal Microphones

  What is a Crystal Microphone?   The crystal microphone is the type most widely used in lower cost installations. It has relatively high output level and high impedance. A long cable will reduce the high output voltage available from a crystal microphone...

Cardioid Microphones

Cardioid Microphones are microphones primarily used for picking up sounds with high gain from the front and sides but poorly from the rear. Their name comes from the fact that their directional sound pick-up is roughly heart-shaped in nature. Cardioid microphones are...

Laser Microphones

The laser microphones primarily found its use in the surveillance industry. Laser microphone is basically a device which detects sound vibrations in the distant object. It can be used to eavesdrop with minimal chance of exposure.   Laser Microphones History...