This eBook guides you to build the 'Musical Door Bell Using Musical IC UM66TBT66T and Transistors'. The eBook is a great price offer to you and this eBook provides a practical hands-on learning experience to the engineers, technicians, students, and hobbyists who are curious and eager to learn and make an electronic project on their own. The project in the eBook explains all the project-relevant topics in a simple and descriptive manner for you. In addition, lots of electronic project-building stuff is included in this eBook which makes it easier for you to build an electronic project. By building these electronics projects boost your skills and analytic power rapidly to a great level and has been used in thousands of applications and is extremely popular. UM66TBT66T is a melody generating IC commonly used in calling bell, phone, toys, musical bell in doors, home security alarm systems, burglar alarms etc and it is a three pin IC looks like a transistor. IC's first pin is ground, the second is VCC and the third is the melody output. And supply voltage that can be given to the IC is in the range of 1.5 Volts to 4.5 Volts. The UM66TBT66T is a CMOS type IC and it consumes very small power for the operation. The Melody generator will reset when the power is turned on and then the melody begins from the first note.