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How to convert a bipolar AC signal to monopolar and feed it to ADC?

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ram indra

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hi fren,
i need to interface adc and pc.The input of adc is sinusodial (220v/3v). I have used adc0808. please would u tell me how to convert this bipolar ac signal to monopolar and feed to adc. so i need a complete circuit from u.thanks for ur kind help
 

IanP

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Re: bipolar to monpolar

The simplest method to convert +/-230V ac to 0-5V, which is the input range of the ADC0808, is to use voltage divider with 2.5V voltage shift .. see picture below ..

Regards,
IanP
 

Koson

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Re: bipolar to monpolar

for more complexer circuit, u can use zero-span cct for adjust zero level and gain of input signal.
it's best for impedance maching but bad if u don't like to have opamps on ur board :)
 

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