Principle and manufacturing method of electronic horn of motorcycle and electric vehicle

Principle and manufacturing method of electronic horn of motorcycle and electric vehicle

Design principle: Motorcycle or electric car horns generally use electromagnetic vibration type, which has a set of coils inside. The magnetic field is generated after energization, and the vibrating membrane is attracted to make sound. Its advantage is simple structure. However, its working current is large, and the general minimum working current is also 1.5A, and the additional high-bass snail-type horn, the working current is up to 3A, which is easy to cause damage to the horn switch and line when used. The following introduces a low power consumption High loudness electronic horn.

The circuit is shown in the figure. NE555 constitutes an audio oscillator circuit. The audio signal is output through its 3-pin, and is directly coupled to the composite tube power amplifier circuit composed of triodes VT1, VT2, and VT3 for amplification, and then the speaker Y is pushed to sound. Because the power amplifier uses three-tube composite amplification, its The magnification is very large, so the circuit consumes less power and has a higher loudness, reaching 122dB. After measurement, its working current is less than 0.5A.
During production, the speaker Y uses a small-caliber high-frequency moving coil type electric horn of 4Ω and 5W. If you can find a moving coil horn siren horn, the effect will be better; adjusting R can change the pronunciation effect of Y. It can also be achieved by changing the value of C1. Note that Y should be installed in a waterproof place.