The ADC0808 or ADC0809 are 8 bit and 8 channel analog to digital converters and
have very good results in the conversion. they are easy to use and can be used
in variety of projects. Their interfacing with micro controllers like at89s51 is
very simple , for further information look on this
http://microcontroller51.blogspot.com/2009/07/interface-of-adc0808-with.html
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