Audio Amplifier takes a small signal and increases its amplitude without making any other major changes in it. An audio amplifier simply boosts the incoming audio signal voltage mere by increasing both its voltage, and current Pulse Power. The signal amplification is measured by amplifier’s gain expressed in decibels (DB) as it’s a ratio of the amplifier’s output divided by its input.
Signal amplification is a sensitive task as the musical sound generally contains many frequencies. All frequencies must be amplified by the same factor to avoid change of wave form and off course the quality of sound. An efficient amplifier should multiply the amplitudes of all frequencies by the same wave form factor in order to give better output. If by chance different amplitudes of frequencies get multiplied then it may lead to many distortions. It should be made sure that amplifier provides enough power to boost loudspeakers, as otherwise the amplifiers are considered the most uncomplicated element of a sound system.
A major difference between analog amplifier and digital amplifier is that in the analog type of amplifier the power is released from its output to the loudspeakers in sync within coming audio wave form. Whereas digital amplifiers use high-frequency switching circuitry to modulate the output devices. There are many types of amplifiers available in the market e. g. power amplifiers, tube amplifiers etc.
Power amplifiers have only single set of inputs and one pair of level controls; to match the amplifier to the rest of the system. The tube amplifiers which are used mostly in the musical instruments are basically different from other hi-fi or stereo amplifiers. The stereo equipment with in-built stereo amplifier should be as completely free from distortion. On the other hand musical instrument amplifiers have always distortions but their basic settings are set by musicians to make the sound more expressive. A tube amp works in a different way as here the signals are more distorted before clipping than any other solid state amplifier. Its distortion increases slowly, and then more fast as the amp begins to clip. Solid state amplifier on the other hand works differently. Its working is opposite as the signal is non-distorting up to the point that it clips.
Amplifiers are basically important components of speakers. All the electronic equipment’s such as TV, computers and CD players use speaker to produce the sound. It would be interesting to know that sound is transmitted through air particles which in-turn form a pulse. Our ears pick up these fluctuations in air and later these signals are converted to electrical signals and transmitted to our brain. As the center of the cardiovascular system, the heart plays an important role in the life and health of the human body. It is responsible for delivering oxygen-rich blood to other parts of the body and regulates many areas of our auto immune system.
When assessing our health, the very first vital sign the doctor or health worker seeks is our heartbeat. This 10-ounce muscle can pump around 2, 000 gallons of blood through some 60, 000 miles of blood vessels each day. By comparison, a faucet would need to be turned on all the way for around 45 years to put out enough water to equal the amount of blood pumped by the heart in an average lifetime.
The heart generates its own electrical power and it can continue to beat even when taken out of the body, as long as it is supplied with enough oxygen. The energy the heart creates is enough to drive a truck 20 miles each day; and if you collect that energy within a person’s lifetime you’d have enough to drive to the moon and back.
In the human fetus, the heart starts beating even before the brain has developed. And in more sublime ways, the heart continues to demonstrate its importance. Since the dawn of time it has been considered the seat of emotion, virtue, courage and wisdom.
Ancient cultures believed the heart has a hand in determining our decisions. Poets and romantics have always celebrated the heart as the embodiment of love, romance and passion. Artists have rendered the heart in an infinite number of creative and surprising ways — from fiercely burning to being hard as stone.