UM66 is a melody generating IC commonly used in calling bell, phone, toys, musical bell in doors, home security alarm systems, burglar alarms etc. It is a three pin IC looks like a transistor. Its first pin is ground, second is VCC and the third is the melody output.
- 64-Note Rom memory
- 1.5V ~ 4.5V power supply and low power consumption
- dynamic speaker can be driven with external NPN transistor
- OSC resistor hold mode
- Power on reset: melody begins from the first note
- Built in level hold mode