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perhaps try to increase the oscilation by experimenting the R/C circuit of the ADC0804, or look 4 an High speed ADC.... for ur design i thnk much better you need to storge it 1st b4 feeding it to the pc then after temporarilly storge then you can transfer it to the pc serially by using com port in this process you can go as 1mhz up to 5mhz.
Thanx people for ur replies.....
me and ma frnds hv looked for all these options... but our guide is not allowing us to use the ADC IC..... he is forcing usto use AVR microcontroller in the circuit
Now can any1 plzz help me in interfacing the AVR microcontroller Atmega8 or 16 in ma circuit... i want to use it as an ADC and zero crossing detector... .. i knw how it ll wrk as ADC but can any1 tell me how it ll wrk as zero crossing detector??
also.. can one uc handle both the fuctions w/o loosing its speed of operation...???