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An integrated circuit two tone siren circuit diagram

2017-08-07 20:09  
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This article is an integrated circuit two tone siren circuit diagram. The principle is simple and very practical. Want more thoroughly grasp the principle, you should understand and be familiar with the major components of the circuit, such as: BC337 , 1n4148.
This circuit is used for fun, children, suitable for installation in bicycles, electric cars and motorcycles, but also in the model and other games. With SW1 positioning of a typical circuit diagram shown in the sound of the car dual police or firefighters, by the oscillation of IC1A and IC1B gates. In other locations and SW1, old siren sound, then slowly increased in frequency is reduced, thereby reappearance of P1 to oscillate in IC1C and IC1D. Speakers from Q1, should be a reasonable size and packing, in order to obtain a more realistic and sound output. Tone and sound vibration can transform to change the value of C1 and C2, C5, C6 and/or related to the resistance. No power switch: leave SW1 in the low position (old siren) and circuit consumption will be negligible. 

Circuit diagram:

Siren circuit diagram


R1,R3___470K   1/4W Resistors
R2______680K   1/4W Resistor
R4_______82K   1/4W Resistor
R5______330K   1/4W Resistor
R6_______10K   1/4W Resistor
R7_______33K   1/4W Resistor
R8________3M3  1/4W Resistor

C1,C5_____10μF  25V Electrolytic Capacitors
C2,C6_____10nF  63V Polyester Capacitors
C3_______100nF  63V Polyester Capacitor
C4_______100μF  25V Electrolytic Capacitor

D1-D3___1N4148  75V 150mA Diodes

IC1_____4093   Quad 2 input Schmitt NAND Gate IC

Q1______BC337   45V 800mA NPN Transistor

P1______SPST Pushbutton

SW1_____DPDT Switch

SPKR____8 Ohm Loudspeaker

B1______6V Battery (4 AA 1.5V Cells in series)


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