Music Generator Schematic Using UM66


UM66 is a pleasing music generator IC which works on a supply voltage of 3V. the required 3V supply is given through a zener regulator. its out put is taken from the pin no1 and is given to a push pull amplifier to drive the low impedance loud speaker. A class A amplifier before push pull amplifier can be used to decrees the noise and improve out put. UM66 is a 3 pin IC package just looks like a BC 547 transistor.

Circuit diagram:

Music Generator Schematic Using UM66-Circuit diagram


  • R1 = 4.7K
  • C1 = 10uF-25v
  • D1 = 3.3v Zener
  • Q1 = SK100
  • Q2 = SL100
  • IC = UM66
  • SP = 8 ohm

Pin out of UM66 IC:

  • Output----Melody Output
  • +Vdd-----Positive power supply
  • -Vss------Negative Power supply

Features of UM66T series:

  • 62 Note ROM Memory
  • Voltage rating: 1.3V to 3.3 V
  • Power on reset