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 NXP Semiconductors


  • Multipurpose Audio Equalizer

  • Created: May 12, 2014

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Summary

This simple circuit is designed to provide visual indicator for audio input. The generator of audio can be human voice, music produced by speakers, environmental disturbances and other systems that produce sound.

The 80C51 microcontroller is set to clock double mode using 20MHz crystal oscillator. It also serves as transmitter and receiver of the system. The clock double mode of the microcontroller improves visual representation since it delivers data much faster than standard mode. The MK1 device is a microphone that receives audio signal. The PCF8589 is an 8-bit A/D and D/A converter that converts the analog signal from microphones to digital and it serves as a transmitter of data with respect to I2C bus line. The PCU9955TW device is a 16-channel Ultra Fast-mode (UFm) I²C-bus 57mA constant current LED driver optimized for dimming and blinking 57mA Red/Green/Blue/Amber (RGBA) LEDs in amusement products which controls the LEDs for Audio Visual Representation and it serves as a receiver of data with respect I2C bus line. It requires 10kΩ pull-up resistor with address input A0 and A3 to obtain the best system level Emergency Switch Device (ESD) performance. The 1kΩ for Rext is used so that each channel can be programmed with its individual IREFx in 256 steps and in 225uA increments to a maximum output current of 57.375mA independently.

The design circuit is suitable for more productive audio representation. The LEDs can be arranged to a specific figure or symbol that maximizes its features. The common designs for LEDs equalizing applications are cross, star, and heart. The project is not limited to audio equalizing applications, it can also be used in signaling and warning system applications.

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