What is an audio amplifier?
An audio amplifier is an electronic circuit that increases the amplitude, in this case the volume of low power audio signals, like that from guitar or a radio to such an extent that these signals can be used to hear the output on certain devices like loudspeakers or headphones. An audio amplifier consists of transistors, a device to convert input audio signals (like a mic) and a speaker at the output. Almost all audio systems use amplifiers, in fact most audio systems these days use more than one amplifier, these are usually low power amplifiers and are known as pre amplifiers. The job of these pre amplifier circuits is to convert a weak audio signal into a signal that is strong enough for further processing without having a lot of change in the original signal due to noise. Without these pre amplifiers, the final audio heard at the output would extremely distorted.
About the TDA2030
The amplifier consists of one power channel and one input signal channel on one side, and on the other side it has an output channel to which a speaker is connected. This amplifier circuit is widely used in car stereo, tape recorders and medium power speakers. The amplifier has an operating voltage of 6-12V with an 18 Watt power amplification circuit design. It is equipped with a potentiometer which enables the user to adjust the amplification volume. The circuit is potable with a small size of 32 x 24mm and has a peak current output of 3A, making it extremely popular in devices having mid-range power levels. However to use the amplifier we might need some connectors or sockets (RCA) based on our application needs.
How to use the amplifier?
(i) Connections: -
• Connect the VCC pin and the GND pin of the amplifier to a power supply. The amplifier works on
6- 12V, here we are giving it a 12 V supply.
• Connect the IN and GND pins of the amplifier to a source of audio signals, here we are using our laptop as a source of audio signal for which purpose we have used the audio jack of a headphone to provide the input signal to the board. You can use any other input source like a mic or an instrument capable of transmitting signals. We can also use an RCA socket to connect the amplifier input pins with our laptop to provide an input to the circuit.
• Connect the output channel of the amplifier to a speaker, and we have our amplifier ready for use. (Buy link 4 ohm 3w Speaker)
Applications: -• Car stereo
• Tape recorder
• Speakers (e.g.4 ohm 3 watt Speaker)
• Public announcement systems
• Inexpensive instruments