Ambulance sirens circuit

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  Posted by momename - November 27, 2010 at 11:24 pm

This circuit is a circuit that sounds a siren-like sound of ambulance sirens. This circuit is different to an ambulance siren circuit generally, is to use transistors instead of IC 555. Which allows economical and easy to tailor a network.

Operation of the circuit. This cycle can be divided into three main parts is the low frequency production. Production of high frequency. The amplifier.

The manufacture low-frequency includes Q1(C458), Q2(C458), R2, R3, C2, C3. Which will produce low-frequency out and to extend the Q3. Before you sent with high frequency of origin from Q4(C458), Q5(C458), R8, R9. , C5, C6 signal is included, then the output will come out to the leg E of the Q5(C458). and then be expanded with Q6(BC337) to drive the speakers. The C1, C4 is intended to stir filter collects them. The R11 will help prevent speaker damage.

Note:
Transistor Q1-Q5, you can use very many number that is NPN 100mA current collector. For example :
2SC1815 or 2N2222 or 2N3904 etc.

ambulance-sirens-circuit


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