Motor Bike Brake Horn

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