We all have some audio players (mono or stereo) in our home. But these players will not give any good response at lower frequencies. For getting better bass, we are using home theaters.
But by this project, I made a good stereo amplifier which gives a output for connecting a sub woofer. We can select the input as FM, USB, SD card or AUX as inputs, and the total cost of this project is less than the price of a home theater available in market.
For making of this project the following are the requirements.
- single IC audio amplifier board (CD6283)
- sub woofer low pass filter & amplifier board
- step down transformer with input 230V and output 12-0-12 V, 1 A
- step down transformers with input 230V and output 12-0-12V, 3A
- FM and USB decoder module
FM and USB decoder module
- potentiometer 47 k - 2 nos.(dual variable)
- potentiometer 100k - 2 nos.(dual variable)
- on/off switch - 2nos.
- bass and treble control circuit (for connecting bass and treble volume controls)
- red LEDs for power indication.
- resistor 220 ohm - 2 nos.
- regulator 7805.
- potentiometer knobs.
- wires and soldering equipments.
- a wooden or metal box for connection of all the above things.
- two speakers 10 watt.
- sub woofer 5 inch.
- diode 1N5804 3A
How to make?Firstly we have to wire up all the components and boards as per shown in the diagram below.
The 12V 1A transformer is used for powering the single IC audio board and the 12V 3 transformer is for the low pass filter and amplifier circuit. The supply is rectified using the 1N5804 Diodes.A minimum of 3A is needed for proper operation of the sub woofer.
The input is taken from the FM and USB decoder module. we can also connect a micro SD card and aux cable to it and this module is available at local electronic stores.This module is powered using a 7805 regulator(for safe operation).the input for the regulator is taken from the amplifier board(after filtering capacitor).
A power indicating led and switch is connected as in the diagram.
The three output wires from FM module(left, right, ground) are given to the bass and treble control circuit( not necessary).the six wires for connecting to 100k POT's for normal bass and treble control is connected to them. the output from this board is connected to main volume control and the low pass filter and amplifier(bass boost )board.the three wires from tis board is connected to bass control 47k POT.
The output for connecting speakers and sub woofers is taken from amplifier board and LPF board, respectively.
We can make a beautiful front panel for better look and controls as shown in the photo of my model at the back side we can connect thge connectors for speaker wires.
How to reduce the noise?When we are making any audio system, there is a chance of production of noise. In amplifiers it might be a humming sound. we have to provide proper ground for all parts of the circuit like heat sinks of IC's, volume controls etc. by doing this we have reduce or fully cancel out the noise.
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