TWO TONE SIREN
TWO-TONE SIREN
|
IC1, IC2 |
LM3909 LED flasher/oscillator |
|
SPKR |
smali 8 fi speaker |
|
C1 |
0.1 p.F capacitor |
|
C2 |
470 |if 6V electrolytic capacitor |
|
R1 |
10 kft '/i W 5% resistor |
|
R2 |
4.7 kfl 'A W 5% resistor |
|
R3 |
100 potentiometer |
|
R4 |
33 fi 'A W 5% resistor |
IC1 generates the main siren tonę while IC2 generates a low-frequency sąuare wave, switching IC1 between two different tones.
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