Take the old chip and put it into the new circuit replacing the new chip, and see if the old chip works works. I doubt that where you purchased the chip will take the old one back. The is a general rule with electronic parts is no returns.
Take the old chip and put it into the new circuit replacing the new chip, and see if the old chip works works. I doubt that where you purchased the chip will take the old one back. The is a general rule with electronic parts is no returns.