In this project, you are going to blow a car horn by mixing two sounds of different frequencies. After completing the project, you will be able to produces a low-tone horn, simulating one of the various horn sounds.
When you finish wiring, turn power ON and press S1. As far as you hold S1 down, you will be hearing a sound similar to a car horn.
This project has two astable multivibrators configured of transistors. One multivibrator, made up of Q1 and Q2, puts out a tone of approx. 300 Hz.
The other multivibrator, made up of Q3 and Q4, puts out a tone of approx. 500 Hz. The two tones are mixed by Q5, amplified by Q6, and given forth from the speaker. What you hear will be a resonance of two sound sources of 300 Hz and 500 Hz.
|Bill Of Materials For Car horn.DSN|
|4||R1, R4, R6, R9||1k|
|3||R2, R3, R8||22k|
|3||C1, C3, C4||0.1uF|