go to this address. scroll down the side and you will find the umc3482 chip that may be identical to the 3481. radio shack used to sell the 3481. played several tunes. I may have one somewhere.
I want to explain to you it is too hard to find .I think you find new manufacturer.
but foresight has this products but it is expensive.I think you contact to foresight if you do not find replacement products.