Electronics Schematic Diagram alarm Door Bell circuit using IC UM 66 part 1

This is a slight modification of that circuit. In the previous circuit you have to keep the switch pressed for making the IC play the full music. Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music till it ends. The time for the IC to play depends on discharging time of C1  which can be set by R1. Set R1 to select your time ,whether full tone or a part in one press. Transistor Q2 drives the speaker.

Electronics Schematic Diagram alarm Door Bell circuit using IC UM 66