Thursday, March 28, 2013

High Fidelity Stereo Power Amplifier Circuit

This is a design circuit for audio power amplifier design utilizing the LM4702. This is a complete circuit for power amplifier design. This circuit has high quality circuit board layouts, the LM4702 power amplifier driver requires careful consideration. A good place to start is with the ground and power circuits design layout. This is the figure of the circuit;

Star connections for ground and power are always a good practice for audio circuit board layouts. A star connection is where there are individual traces from each component in the circuit that return to a central point. Notice how all the ground traces converge at the left side of the board, near Rs1 and Rs2, and connect to the two ground pins in the center of the power connector. The ground traces that connect to the right and left output jacks also converge at the center of the star ground which is the center of the power connector where the two ground pins are located.

[Circuit source: National Semiconductor Notes]

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