Music Box Circuit

Julie Howell

MUA 403

Fall 2006

For my music technology project, I built a music box circuit. It can be placed inside of a box, cabinet, or any other place with a lid, and since the circuit has a light sensor, whenever the lid is opened, the music box will play a song.

Components:

6R8 Resistor

33K Resistor

68K Resistor

100K Resistor

330K Resistor

4.7uF Capacitor

100uF Capacitor

68nF Ceramic Capacitor

2-pin header

Jumpers

Mini push-on switch

LDR

16-pin IC socket

M3481 music IC

M3485 music IC

BC548

BC558

Kit 104 PCB

3V battery snap

8-ohm speaker

This circuit was tricky to solder since all of the connections are very close together. It was difficult not to have any bridges. The kit came with two chips that contained two different sets of music on it. The first has Hawaiian Wedding Song, Try to Remember, Aloha Oe, and Love Story & Yesterday on it, and the second has Christmas songs. There are also jumpers that allow the options of either playing one song and stopping, or playing continuously until the circuit is placed in the dark. Below is a picture of the completed circuit board.