Single IC Dual tones Siren Circuits Wiring diagram

Double-tone Police sound Circuits Diagram

This schema is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the schema diagram, the typical dual-tone sound of Police or Fire-brigade cars is generated, by the oscillation of IC1A and IC1B gates. With SW1 set to the other position, the old siren sound increasing in frequency and then slowly decreasing is reproduced, by pushing on P1 that starts oscillation in IC1C and IC1D. 

The loudspeaker, driven by Q1, should be of reasonable dimensions and well encased, in order to obtain a more realistic and louder output. Tone and period of the sound oscillations can be varied by changing the values of C1, C2, C5, C6 and/or associated resistors. No power switch is required: leave SW1 in the low position (old-type siren) and the schema consumption will be negligible.

Single -IC Dual-tones Siren Circuits Diagram

Parts:

R1,R3___470K1/4W Resistors

R2______680K1/4W Resistor

R4_______82K1/4W Resistor

R5______330K1/4W Resistor

R6_______10K1/4W Resistor

R7_______33K1/4W Resistor

R8________3M31/4W Resistor

C1,C5_____10µF25V Electrolytic Capacitors

C2,C6_____10nF63V Polyester Capacitors

C3_______100nF63V Polyester Capacitor

C4_______100µF25V Electrolytic Capacitor

D1-D3___1N414875V 150mA Diodes

IC1_____4093Quad 2 input Schmitt NAND Gate IC

Q1______BC33745V 800mA NPN Transistor

P1______SPST Pushbutton

SW1_____DPDT Switch

SPKR____8 Ohm Loudspeaker

B1______6V Battery (4 AA 1.5V Cells in series)