How to convert AC signal in mili volts to DC signal

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adnansarwar2050

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I am using ACS712 hall effect current sensor.

https://www.allegromicro.com/~/media/Files/Datasheets/ACS712-Datasheet.ashx

It gives 66mV/A. I am using ADC0808 to read the value of AC current passing through real load. Now the problem is that ADC0808 reads the analog values but i need the peak value of current. How can I read this signal with ADC0808. Can any one please help me.
 

Hi,

Use an opamp to amplify the signal.

You say you need the peak value.
* Either your sampling frequency is high enough to catch the peak, then you can find the peak with software
* Or you need external analog circuitry to catch the peak...then convert to digital

Can you define the "peak" with timing, voltage and frequency (repeating)?

Klaus
 

If this signal sinusoidal , you may multiply by 1.41 that is peak value.
If it's not, you should use simple tracking peak detector with a OpAmp.
 

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