Motor Bike Brake Horn

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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”.

circuit-diagram-of-motor-bike-brake-horn

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

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