Introduction:
The circuit can be operated from 4.5V to 12V DC or direct from the brake point of the motor-bike, Resistor R7 should be replaced with 1-ohm. 1/2W in case of an 8-ohm speaker. T5 is a driver transistor. C3 polarity can be reversed for a sudden off of the circuit.
The sound produced is like “Kiun, Kiun”.
PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon)
- R1, R7 = 2.2 KΩ
- R2, R4 = 820 Ω
- R3, R5 = 470 Ω
- R6 = 4.7 KΩ
- R8 = 10 KΩ
- R9 = 4.7 Ω, 0.5W
Capacitors
- C1 = 22 µF/25v
- C2 = 4.7 µF/63V
- C3 = 100v/16V
- C4 = 0.047 µF
- C5 = 0.01 µF
Semiconductors
- T1 – T4 = BC148B
- T5 = SL100
Miscellaneous
- LS1 = 4Ω speaker
