HK523 Door Bell Sound Generator IC

HK523 Door Bell Sound Generator IC
Price: $2.99
Datasheet: 

HK523  Door Bell Sound Generator IC.

This IC can produce two different sounds: a "Ding-Dong" sound or a "Bird" sound, depending on how the IC is  configured.

The App Note shows how to set it up and how to modify the sounds. The IC comes in a DIP-16 package.