Single IC Siren Circuit Schematic Diagram


This circuit is built with one sigle IC which has one audio power amplifier, two transistor, the T1 and T2 which form basis of a astable multivibrator with variable frequency. Trimpoi P1 is used to control the multivibrator. This circuit produces sound like a heartbeat siren. The frequency of the melody can be controller with trimpod P2. Here is the schematic :

Single IC Siren Circuit Schematic

Single IC Siren Circuit Schematic Diagram

Components :
R1,R4,R7 : 10k ohm
R2 : 560k ohm
R3 : 220k ohm
R5 : 22k ohm
R6 : 15 ohm
R8 : 1k ohm
C1,C4 : 100 nF
C2,C3 : 1uF/16V
C5 : 47 uF/16V
IC1, T1, T2, T3 : LM389
P1 : 1M Trimpot
P2 : 100k ohm Trimpot

Estimated price : $5


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