Multi Sound Generator

This is very interesting project in the series of sound generator as its name indicates multi sound generator, generates eight different sounds from the single circuit. The main advantage of the project multi sound generator is simple because consists very few components and operating voltage is very low.

Circuit Description of multi sound generator

The heart of the circuit multi sound generator is monolithic L-S-I sound generator IC HT288/HT88 which is 18 pin dual lines IC. VCC supplied to pin 2 and pin 1 is directly grounded. Generated sound output is taking from 6, 7, 8, 9, 10, 11, 12, 13 which is connected to one pole eight way switch as shown in circuit diagram. Output signal is obtained from pin number 4 according to the selected position of switch SW and transfer to base of transistor T1 through R1. Transistor T1 and T2 forms Darlington pair for amplify signal and fed to speaker for output.

Eight different type of sound output from this project

  1. Rifle gun sound
  2. Gun sound
  3. Animal sound
  4. Dual tone melody sound
  5. Machine gun sound
  6. Machine gun sound
  7. Bombarding sound
  8. Boarding sound



Resistors (all ¼-watt, ± 5% Carbon)

R1 = 100 Ω

R1 = 150 KΩ


IC1 = HT288/HT88

T1 = BC147

T2 = BEL187


Speaker 8 Ω

SW1 = Push-to-on switch

SW2 = One pole eight way switch



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