hi to all please help me.... I have an project "metal detector" i need an frequency counter ic ship in range between 8khz and 40khz to convert any change in freq. To voltage so is there anybody know ic chip name..

Thanks alot
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is there any one know the answer??

 

Here is a circuit which uses a LM331.

http://www.circuitstoday.com/frequency-to-voltage-converter-using-lm331

Is this useful for you?

 

thanks for your help

 

No problem.