Home Projects Audio 3 Tone Musical Bell


3 Tone Musical Bell
author: Rajkumar Sharma

This project is a 3 tone musical bell.


3 Tone Musical Bell is a project built around BT66T (UM66) IC driving, LM386 has been used as audio amplifier to give extra punch.


Input 6 VDC @ 200 mA
Output 8 Ohms 0.5 W Speaker
Terminal pins for supply voltage and speaker connection
Power-On LED indicator
Onboard push to ON switch
Four mounting holes of 3.2 mm each
PCB dimensions 35 mm x 54 mm

CN1 - DC Supply Input
LS1 - Speaker Output
SW1 - Tactile Switch (Push to ON)
D1 - Power-ON LED Indicator




Parts List

PCB Design

PCB bottom layer






120x90 spot



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