Hi David,
Thanks for the response. It is available with Adafruit. I have clone version. But it works.
I have put a 2k pot to ground on the O/P and wiper is presently connected to my PC to see the O/P.
The compression ration of this chip is 1:500 1:2000 and 1:4000. I cannot understand which is the best.
Regards
Ashok