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ADC 0808 in free running mode

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elrayes

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0808 free running

Hi
I noticed when using ADC 0808 IC in the free running mode it is better to use channel 7 for analog input (not channel 1 as many net resources refer) cause when i used analog channel 1 it wasn't stable, full of noise and interference and actually I don't know why, beside you can use 555 as a source of clock.
Attached the schematic for the ADC 0808 in free running mode.
 

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