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Thursday, April 23, 2015

American & Hong Kong police siren

Today I suggest siren circuit. Another circuit is very interesting. It can mimic the sound of a American police car and Hong Kong police. By which we use transistors mainly. For is so easy to buy equipment and budget.
How does it work.
In a Figure 1 will see that include of two sound generator set. First sound generator consist of Q1, Q2, C2, C3 and R1-R4. Then a second sound generator will include of Q3, Q4, C5, C6 and R7-R10. The sound signal will Different as level of parts in circuit.
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