Description
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:
Parts:
- 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
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