Hi-fi Audio Amplifier Circuit Design and implementation

Posted on Feb 6, 2014

Designing Audio amplifier from the scratch using discrete componentsis interesting, as it allow users to design amplifiers that can satisfy their various requirements. With audio amplifiers, low level sounds from mobile devices around us can be made more louder and lively as well. Based on the specifications of theHi-fi Audio amplifier, the values

 Hi-fi Audio Amplifier Circuit Design and implementation
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of the system components werecalculated and selected accordingly to give rise to the schematic shown in figure 1. 0. D1 is a green LED, and should be a standard type. Don`t use a high brightness LED, or change the colour. This is not for appearance (although the green LED looks pretty neat on the board), but for the voltage drop. Different coloured LEDs have a slightly different voltage drop. VR1 is used to set the quiescent current, and normally this will be about 50-100mA. The amp will work happily at lower current, at less than around 40mA. Transistor Q4 and the output drivers (Q5 and Q6) will normally not require a heat sink. Q7 and Q8 seriously need a proper heat sink, else they will burn out! Note: Any specification can be chosen, but the modification on the circuit will affect the power supply used and the output transistors ( MJ15015, MJ15016 ). Make sure that the output transistor`s Maximum IC (Collector Current) is greater than the calculated IO. You can get the detailed datasheet of all the components at Alldatasheet. com.

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