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.
Figure 1 The circuit diagram of a perfect American & Hong Kong police siren.
When a S2-switch is on “Hong Kong” position, the sound signal from a first series will out off from collector(C) of Q2 through R5 to controll working of the second sires. Which cause can get the output signal at collector of Q4 through R11 in to Q5 will be transformer-T1 by it is used to match the output of such circuits to a speaker.
If slide sw1 to “191” position will has also some sound signal through C4. A capacitance-C4 will cause feature of sound signal is changed.
How to build its.
You can assemble parts on the perforated board or universal board. But if you want to make PCB in permanent version. You can see in Figure 2 is actual-size of Single-sided Copper PCB layout. And Figure 3 is a components layout and wiring.
Figure2 The Actual-size of Single-sided Copper PCB layout
Figure 3 The components layout and wiring
Application of this projects.
When assemble this project completely then to check for error, next apply the power supply 9-12volts, then test them by apply a 9-volts battery to the circuit. Next turn on power switch then press S2 we will hear a sound of siren from speaker anf LED1 flashes.
The applications can do many things. Such as be installed in the police car toy. Be installed on a motorcycle or a beep alarm for you.
The components list
Resistors ¼W +-5%
R1, R4, R7, R10—-1K ___________________ = 4 pcs.
R2, R3, R8, R9—–56K __________________ = 4 pcs.
R5——22K______________________________ = 1 pcs.
R6——560 ohms_________________________ = 1 pcs.
R11—–4.7K______________________________ = 1 pcs.
R12—–50 ohms___________________________= 1 pcs.
Transistors
Q1-Q5——————C458 or similar (C1815 or C828)___= 5 pcs.
Polyester Capacitors 50V
C5, C6——————0.0047uF ______= 2 pcs.
Electrolytic capacitors
C1———————–220uF 16V ______________________= 1 pcs.
C2, C3——————3.3uF 16V _______________________= 1 pcs.
C4———————–33uF 16V ________________________= 1 pcs.
T1————-OT-601 ____Output transformer___________= 1 pcs.
S1, S3——– SPDT- Single-pole, Double-throw switch__= 1 pcs.
S2————-normally pushbuttom____________________= 1 pcs.
Others
LED, speaker 8 ohms, PCB, Universal box.
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.
Figure 1 The circuit diagram of a perfect American & Hong Kong police siren.
When a S2-switch is on “Hong Kong” position, the sound signal from a first series will out off from collector(C) of Q2 through R5 to controll working of the second sires. Which cause can get the output signal at collector of Q4 through R11 in to Q5 will be transformer-T1 by it is used to match the output of such circuits to a speaker.
If slide sw1 to “191” position will has also some sound signal through C4. A capacitance-C4 will cause feature of sound signal is changed.
How to build its.
You can assemble parts on the perforated board or universal board. But if you want to make PCB in permanent version. You can see in Figure 2 is actual-size of Single-sided Copper PCB layout. And Figure 3 is a components layout and wiring.
Figure2 The Actual-size of Single-sided Copper PCB layout
Figure 3 The components layout and wiring
Application of this projects.
When assemble this project completely then to check for error, next apply the power supply 9-12volts, then test them by apply a 9-volts battery to the circuit. Next turn on power switch then press S2 we will hear a sound of siren from speaker anf LED1 flashes.
The applications can do many things. Such as be installed in the police car toy. Be installed on a motorcycle or a beep alarm for you.
The components list
Resistors ¼W +-5%
R1, R4, R7, R10—-1K ___________________ = 4 pcs.
R2, R3, R8, R9—–56K __________________ = 4 pcs.
R5——22K______________________________ = 1 pcs.
R6——560 ohms_________________________ = 1 pcs.
R11—–4.7K______________________________ = 1 pcs.
R12—–50 ohms___________________________= 1 pcs.
Transistors
Q1-Q5——————C458 or similar (C1815 or C828)___= 5 pcs.
Polyester Capacitors 50V
C5, C6——————0.0047uF ______= 2 pcs.
Electrolytic capacitors
C1———————–220uF 16V ______________________= 1 pcs.
C2, C3——————3.3uF 16V _______________________= 1 pcs.
C4———————–33uF 16V ________________________= 1 pcs.
T1————-OT-601 ____Output transformer___________= 1 pcs.
S1, S3——– SPDT- Single-pole, Double-throw switch__= 1 pcs.
S2————-normally pushbuttom____________________= 1 pcs.
Others
LED, speaker 8 ohms, PCB, Universal box.
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