Two Tone Electronic Siren Circuit


This is the circuit diagran of two tone electronic siren. The scheme is simple and easy to built, it based on two ICs with different task: produce audio signal and amplify the audio signal.

List of Components:

R1-R2-R3: 2.2KΩ
R4: 1KΩ
R5: 10K (potentiometer)
R6: 470Ω
C1 - C2: 10 uF
C3 - C4: 470 nF
C5: 10 uF
C6: 220 uF
IC1: Integrated Circuit TTL 7400
IC2: LM386
Z1: Zener 5 volts 1/2 watt
Speaker 8 Ω