Hey guys I am using a current sensor for measuring the AC current its name id KG190. It gives an output current of 5mA on the secondary for a 5A primary current. The output signal is very weak to be sampled by the arduino so it has to conditioned before being sent to the arduino. I want to usean opamp to do the amplification. I tried searching and working out any solution. I need your help for a circuit that can amplify the signal of the signal of the CT. i am attaching a photo of the the KG190 sensor. Please help!
A data sheet would be much more useful than a picture. A search for that number turns up diddly.
I too dont have the datasheet. I just mailed the manufacturer to send me a copy of the datasheet. Hope he has it. 
Sorry guys but there is no datasheet. The only thing we need to know is that 5/5mA. But the manufacturer did say that We should use a current to voltage converter using lm358 to get the output voltage to swing between 5v and 0 v. I need your help in designing a current to voltage converter.
Thank You
Current to Voltage Converter for KGI90:
You should study this by visiting this URL:Current to Voltage Converter - Analog Electronics Tutorials
In Sha Allah you will get your answer.
Another useful site for the same purpose ie current to voltage conversion circuit.It is in animation form.
URL:Current-to-Voltage Converter
Best of luck