Home Projects Audio 3 Tone Siren


3 Tone Siren
author: Rajkumar Sharma

This project is a 3 tone siren based on UM3561 IC.


3 Tone Siren project produces Gun Sound, Police Siren and Ambulance Siren effects from a speaker.  This project is built around UM3561 IC driving an LM386 audio amplifier to give that extra punch.


Supply input 6 VDC @ 200 mA
Output : Speaker, 8 Ω / 0.5 W
Two slide switches select and play different tones
On/Off Side switch for supply input
Terminal pins for supply input and speaker output
Power-On LED indicator
Four mounting holes of 3.2 mm each
PCB dimensions 42 mm x 64 mm


download schematic in PDF


Parts List

PCB Design

PCB bottom layer






120x90 spot



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