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To connect microphone to ADC you require a preamplifier. A simple preamplifier with transistor BC547 connect ur mic input to the base use a coupling capacitor .47MicroF
drive using 4.5 V Power and use 220Ohm collector resistor and10k Base resistor and the o/p taken from collector terminal feed...
Most probably your device might be functioning eratticaly .I have tried the same with NiMH batteries and Iam get exactly 5V withLM7805 from National semiconductor
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