TMS320C5X DSK ANALOG I/O

The 'C5x DSK is designed to directly connect to a microphone and an 8-ohm speaker via RCA jacks. The I/O RCA jacks are directly connected to the dual A/D and D/A converter called the Analog Interface Circuit (AIC). In some instances, the microphone does not generate the signal level required for the AIC to detect and convert the signal. It is suggested that a dynamic or amplified (pre-amp) microphone be used to ensure the appropriate signal level is achieved. The output signal from the AIC can be heard if the connected speaker is small, low power, and easy to drive

An inexpensive option is to build a pre-amp for the input and a speaker driver for the output using a few operational amplifiers and other components. This document explains how to do this, with schematics and output waveforms.

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